Title: AGRICULTURE INVENTORY ELABORATION PART 2
1AGRICULTUREINVENTORY ELABORATIONPART 2
2Status of national communications from NAI Parties
- By September 2003, 70 national communications
(NCs) from non-annex I (NAI) Parties had been
compiled and assessed by the UNFCCC secretariat - According to Compilation and Synthesis reports,
the problems encountered by NAI Parties in
elaborating their national inventories ranked - activity data 93 per cent
- emission factors 64 per cent
- methods 11 per cent
3Status of national communications from NAI Parties
- NAI countries voluntarily submit their national
GHG inventories and NCs - By mid-2005, 117 NAI Parties had submitted their
first national communication 3 NAI Parties had
submitted their second NC 1 NAI Party did not
include its national inventory - Submitted inventories 82 NAI Parties for 1 year
(1994, mainly) 12 NAI Parties for 2 years
(1990/94) 18 NAI Parties for 34 years 12 NAI
Parties for gt4 years - 100 NAI Parties included CO2 99 included CH4
and N2O 20 included HFCs, PFCs or SF6
4Status of national communications from NAI Parties
- An important proportion of the problems mentioned
are related to LUCF - Eliminating this sector from the analysis, the
number of Parties mentioning problems decreases
substantially - Problems only with LUCF 13 per cent (9
countries) - Problems with LUCF and other sectors 60 per cent
(42 countries) - Problems, excluding mention to LUCF 27 per cent
(19 countries)
5Status of national communications from NAI Parties
- The Agriculture sector is second in terms of
problems - Problems only with Agriculture 0 per cent
- Problems with Agriculture and other sectors 54
per cent (38 countries) - Problems excluding Agriculture 46 per cent (32
countries) - Figures indicate that the Agriculture sector is
less problematic with regard to elaboration of
an accurate GHG inventory than is the LUCF
sector - 32 out of 70 NAI countries reported that
Agriculture is not a problem (19 NAI countries
reported that the LUCF sector is not a problem)
6INVENTORY ELABORATION
- Previous activities undertaken in the framework
of national GHG inventories - Preliminary key-source determination
- Mass balance for crop residues and animal manure
- Significance of sub-source categories (animal
species, anthropogenic N sources) - Livestock characterization, as part of specific
source category elaboration
7INVENTORY ELABORATIONPrevious activities
- Preliminary key-source determination
- Two ways
- Using last years GHG inventory data
- Applying tier 1 methods for all the sectors for
the year to be inventoried
8DETERMINATION OF KEY SOURCES Steps
- Enumeration of source categories (SC)
- Ranking SC according to their emissions of CO2
equivalent - Estimating individual contributions of the SC to
the total national emissions by dividing the
specific contribution by total emissions and
expresing the result in per cent - Calculating the accumulative contribution of the
SC - Key sources, added together, should account for
95 of GHG emissions
9DETERMINATION OF KEY SOURCES
10DETERMINATION OF KEY SOURCES
1994 GHG inventory of Chile (Gg CO2 equivalent)
(Non-energy sectors)
11DETERMINATION OF KEY SOURCES
12DETERMINATION OF KEY SOURCES Contribution per
sector
13INVENTORY ELABORATIONMass balance
- Mass balance for crop residues
- To be done for each crop species
- Example wheat production in a country with three
agroecological units - Characteristics of the agroecological units
- A Dessert climate, agriculture only under
irrigation - B Mediterranean climate with well-marked four
seasons export agriculture under irrigation - C Rainy and rather cold climate with no dry
season no irrigation
14INVENTORY ELABORATION Mass balance
- According to experts judgement
15INVENTORY ELABORATIONMass balance
- Factors to be applied to total wheat residues
- Total wheat residues
- total productionunit i (residue/production)
factorunit i - Total residues burned in
- Unit A total residuesunit A 0.50
- Unit B total residuesunit B 0.35
- Unit C total residuesunit C 0.20
16INVENTORY ELABORATIONMass balance
- Mass balance for animal manure
- Analysis at species level
- First diversion, confinement and direct grazing
- Second diversion, under confinement, according to
the different manure treatment systems
17INVENTORY ELABORATION Mass balance
- Example non-dairy cattle population in the same
country (same three agroecological units already
described) - First disaggregation of the national population
in agroecological unit populations - Second estimation of total manure produced per
agroecological unit
3B.17
18INVENTORY ELABORATION Mass balance
- Manure from non-dairy cattle, assigned to the
different treatment systems
- Unit A total manure producedunit A x Fi
- If Fi is 0.90 Anaerobic lagoon
- If Fi is 0.10 direct grazing
- (Fi 0 for the rest of the treatment systems)
- Unit B total manure producedunit A x Fj
- If Fj is 0.75 Direct grazing
- If Fj is 0.10 Anaerobic lagoon
- If Fj is 0.20 Solid systems
- If Fj is 0.05 Other systems
- (Fj 0 for the rest of the treatment systems)
- Unit C total manure producedunit A x Fk
- If Fk is 0.35 Direct grazing
- If Fk is 0.35 Anaerobic lagoon
- If Fk is 0.20 Solid systems
- If Fk is 0.10 Other systems
- (Fk 0 for the rest of the treatment systems)
19INVENTORY ELABORATIONSignificance of sub-sources
- Significance of animal species
- Example for CH4 linked to enteric fermentation
and manure management - CH4 emissions estimated by tier 1 method
- Country as a whole, without division into
agroecological units
20INVENTORY ELABORATION Significance of sub-sources
- Steps
- Estimation of animal species population
- As no national AD are available, the use of FAO
database is appropriate - Disaggregation between dairy and non-dairy
cattle, following experts judgement - Filling of Table 4-1s1 of IPCC software with the
population data and the default EFs - Estimation of individual contribution to the
total emissions of the source category
21Significance of sub-sources
22
13
43 SIGN.
65 SIGN.
lt1
6
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lt3
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lt3
43 SIGN.
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3B.21
22INVENTORY ELABORATION
- Simulation for
- Enteric fermentation CH4 emissions
- Manure management CH4 and N2O emissions
- Agricultural soils N2O emissions
- Prescribed burning of savannas non-CO2 gas
emissions - Burning of crop residues non-CO2 gas emissions
- Rice cultivation CH4 emissions
- When possible, analysis of different scenarios
- Less accurate scenario No CS activity data
(usual for non-collectable data factors,
parameters) - Medium accurate scenario No CS emission factors
(very common fact) - Most accurate scenario Availability of CS
activity data and emission factors
23Enteric Fermentation
24Enteric fermentation
- Hypothetical country with
- Two climate regions
- Warm (60 of surface)
- Temperate (40 of surface)
- Domestic animal population
- Cattle (dairy and non-dairy)
- Sheep
- Swine
- Poultry
- Some goats and horses
25Livestock characterization
- Steps
- Identify and quantify existing livestock species
- Review emission estimation methods for each
species - Identify the most detailed characterization
required for each species (i.e. basic or
enhanced) - Use same characterization for all sources
(Enteric Fermentation, Manure Management,
Agricultural Soils)
characterization detail will depend on whether
the source category is key source or not and on
the relative importance of the subcategory within
the source category
26Enteric fermentation
- Inventory simulation for three scenarios
- 1) Low level of data availability
- no access to reliable statistics or other sources
of AD, and cannot use Country Specific (CS) EFs - 2) Medium level of data availability
- detailed statistics on livestock activity,
although some Activity Data (AD2) are still
required along with default/regional EFs - 3) High level of data availability
- good country-specific AD and EFs
27Low level of data availability
Animal population data from FAO database
ltwww.fao.orggt. Open the web page select
Statistical Databases, FAOSTAT-Agriculture and
Live Animals in Agricultural Production
(searching for country, animal type and year)
Disaggregation between dairy and non-dairy
cattle based on experts judgement.
3B.27
28Determination of significantsub-source categories
- Species contributing to 25 or more of emissions
should have enhanced characterization and tier
2 method should be applied - Perform a rough estimation of CH4 from enteric
fermentation applying tier 1 method - one way of screening species for their
contribution to emissions - estimation is to identify categories requiring
application of tier 2 method - use IPCC software, sheet 4-1s1 fill in animal
population data, and collect default EF from
Tables 4-3 and 4-4 of Revised 1996 IPCC
Guidelines, Vol. 3 (also taken from the IPCC
emission factor database (EFDB))
29Determining significant animal species
Worksheet 4-1s1
gt25
No other significant species
Conclusion Tier 2 method, supported by an
enhanced characterization, for the non-dairy
cattle.
3B.29
30Enhanced characterization ofnon-dairy cattle
population
- Enhanced characterization requires information
additional to that provided by FAO statistics.
Consultation with local experts or industry is
valuable. - Assume that (using the above information sources)
the inventory team determines that the non-dairy
cattle population is composed of - Cows 40
- Steers 40
- Young growing animals 20
- Each of these categories must have an estimate of
feed intake and an EF to convert intake to CH4
emissions. Procedure is described in IPCC Good
Practice Guidance and Uncertainty Management in
National Greenhouse Gas Inventories
(GPG2000)(pages 4.104.20).
31Enhanced characterization of non-dairy cattle (1)
3B.31
32Enhanced characterization of non-dairy cattle (2)
To check the estimates of GE, convert to kg/day
of feed intake (by dividing GE by 18.45) and
divide by live weight. The result must be between
1 and 3 of live weight.
3B.32
33Tier 2 estimation of CH4 emissions fromenteric
fermentation by non-dairy cattle
- Enhanced characterization yielded AD (average
daily gross energy intake) for three types of
non-dairy cattle - These AD must be combined with emission factors
for each animal group to obtain emission
estimates - Determination of EFs requires selection of a
suitable value for methane conversion rate (Ym) - In this example (country with no CS data) a
default value for Ym can be obtained from GPG2000
34Tier 2 estimation of CH4 emissions from enteric
fermentation by non-dairy cattle
3B.34
35Tier 2 estimation of CH4 emissions from enteric
fermentation by non-dairy cattle
- Tier 2 estimation for non-dairy cattle
- 259 Gg CH4 (against 245 Gg CH4 for tier 1)
- Weighted EF
- 52 kg CH4/head/yr (againts the default value of
49 kg CH4/head/yr) - This value should be used in the worksheet to
report emissions by non-dairy cattle
36Medium level of data availability
- Assume that the country has good statistics on
livestock populations - Applying the same procedure as in previous
example, the country determines that non-dairy
cattle category requires enhanced
characterization - National statistics expert judgement allow
disaggregation of non-dairy cattle population by - Two climate regions
- Three systems of production
- Three animal categories (same as in previous
example)
37Medium Level of Data Availability
New total 5,153,000 heads (against FAO
5,000,000 heads).
3B.37
38Tier 2 estimation of CH4 emissions from enteric
fermentation by non-dairy cattle
- Enhanced characterization yielded AD (average
daily gross energy intake) for 18 classes of
non-dairy cattle - This AD must be combined with EFs for each animal
class to obtain 18 emission estimates - Next slides will show detailed calculations for
estimating gross energy intake for 6 of the 18
classes (three types of animals for
Warm-Extensive Grazing and three for
Temperate-Intensive Grazing)
39Enhanced characterization, non-dairy cattleWarm
Climate, Extensive Grazing (1)
Comments in green indicate improvements over
previous example.
3B.39
40Enhanced characterization, non-dairy cattleWarm
Climate, Extensive Grazing (2)
To check estimates of GE, convert to kg/day of
feed intake (by dividing GE by 18.45) and divide
by live weight. The result must be between 1 and
3 of live weight.
3B.40
41Enhanced characterization, Non-Dairy Cattle,
Temperate Climate, Intensive Grazing (1)
Comments in green indicate improvements over
previous example.
3B.41
42Enhanced characterization, Non-Dairy Cattle,
Temperate Climate, Intensive Grazing (2)
To check estimates of GE, convert to kg/day of
feed intake (by dividing GE by 18.45) and divide
by live weight. The result must be between 1 and
3 of live weight.
3B.42
43Medium level of data availability
- Estimated GE values are used for calculation of
EF (using equation 4.14, GPG2000) - Calculation of EF required to select a value for
methane conversion rate (Ym), that is, the
fraction of energy in feed intake that is
converted to energy in methane - In this example we assume the country uses a
default value (Ym 0.06, from Table 4.8, GPG2000) - 18 estimates of EF were obtained (next slide)
44Medium level of data availability
3B.44
45Medium level of data availability
- Weighted EF (tier 2, country-specific AD)57 kg
CH4/head/yr (range 42-67 kg CH4/head/yr) - EF for tier 1 49 kg CH4/head/yr
- EF for tier 2 (with default AD) 52 kg
CH4/head/yr - Multiplication of EF with cattle population in
each class yielded 18 estimates of annual
emissions of methane from enteric fermentation,
with a total of 294 Gg CH4/year - Total for tier 1 245 Gg CH4/year
- Total for tier 2 (with default AD) 259 Gg
CH4/year
46Medium level of data availability
Worksheet 4-1s1
3B.46
47Highest level of data availability
- Activity data could be improved by
- more accurate national statistics on livestock
population and uncertainties - further disaggregation of cattle population (e.g.
by race and animal age, or by subdividing climate
region by administrative units, soil type, forage
quality, etc.) - implementation of geographically explicit AD and
cattle traceability systems - development of local research to obtain better
estimates of parameters used for livestock
characterization(e.g. coefficients for
maintenance, growth, activity or pregnancy)
48Highest level of data availability
- EFs could be improved by
- developing local capacities for measuring CH4
emissions by cattle - characterizing diverse feeds by their CH4
conversion factors for different animal types - development of local research to improve
understanding of locally relevant factors
affecting methane emissions - adapting international information (scientific
literature, EFDB, etc.) from areas with
conditions similar to those of the country
49Highest level of data availability
- Numerical example not developed here
- Few, if any, developing countries are currently
in the position of having access to this level of
information - With high level of data availability, countries
would be able to implement tier 3 methods (still
not proposed by IPCC)
50Example of development of local capacity in
Uruguay
- Almost 50 of GHG emissions in Uruguay come from
enteric fermentation - A project was implemented by the National
Institute of Agricultural Research co-funded by
US-EPA to improve local capacity to measure CH4 - First results indicate that IPCC default EF used
so far in preparation of inventories may be too
high - A similar project is being conducted in Brazil by
EMBRAPA
3B.50
51Estimation of Uncertainties
- It is good practice to estimate and report
uncertainties of emission estimates, which
implies estimating uncertainties of AD and EF - According to IPCC, EFs used in a tier 1 method
might have an uncertainty of 3050, and default
AD might have even higher values - Application of a tier 2 method with
country-specific AD can substantially reduce
uncertainty levels compared to a tier 1 method
with default AD/EF - Priority should be given to improve the quality
of AD estimates
52Manure ManagementCH4 Emissions
53Manure management CH4
- We will continue with the assumptions relating to
the same hypothetical country - Again, tier 1 method will be applied to assess
the significance of the different species for
this source category - with the purpose of identifying the need for
enhanced characterization - in practice, this should be done as a first step
in inventory elaboration, considering that it is
good practice to use the same characterization
for all categories (it is presented here for
training purposes only) - Numerical examples for countries with different
levels of data availability will be developed
54Livestock characterization
From FAO database ltwww.fao.orggt, then
Statistical Databases, FAOSTAT-Agriculture,
and Live Animals in Agricultural
Production (searching for the country, animal
type and year)
Disaggregation between dairy and non-dairy
cattle, based on experts judgement.
3B.54
55Livestock characterization
Worksheet 4-1s1
Significant species
3B.55
56Livestock characterization
- The non-dairy cattle sub-source is the most
significant, and deserves enhanced
characterization and application of a tier 2
method for CH4 from manure management - Swine account for 20 of total emissions, and the
country considers it appropriate to develop an
enhanced characterization and apply a tier 2
method for this species as well
57Enhanced characterization of swine population (1)
- Estimation of CH4 emissions from manure
management requires two types of activity data - animal population
- manure management system usage
- Swine population GPG2000 recommends
disaggregation into at least three categories
(sows, boars and growing animals) - However, neither IPCC-GL nor GPG2000 provides
default EFs for these categories - EFDB only provides EFs for European conditions
(not suitable for our example in Latin America) - Therefore, for the case of a country that lacks
CS AD, we assume that the swine population is not
classified into subcategories
58Enhanced characterization of swine population (2)
- Manure management system (MMS) we make the
following assumptions for the inventory
simulation for a country lacking CS AD - swine population is equally distributed among the
two climate regions (i.e. 60 in warm area, 40
in temperate area) - 90 of manure is managed as a solid
- 10 is managed in liquid-based systems
- it is not possible to discriminate between MMS by
climate regions
59Low level of data availability CH4 emissions by
non-dairy cattle, swine
- Tier 2 method requires determination of three
parameters to estimate EF - VS (kg) mass of volatile solids excreted
- Bo (m3/kg of VS) max. CH4 producing capacity
- MCF CH4 conversion factor
- For low level of data
- default AD derived from FAO database and expert
judgement. - default EF from IPCC-GL and GPG2000
- Examples for non-dairy cattle, swine in next
slides
60Low level of data availability CH4 emissions
frommanure management for non-dairy cattle
(default AD and EF) (1)
GE is used for determining VS. If these data
are not available, default VS values are
provided in Table B-1, p. 4.40 IPCC-GL.
3B.60
61Low level of data availability CH4 emissions
frommanure management for non-dairy cattle
(default AD and EF) (2)
Total emissions estimated here are lower than
those using Tier 1 (8.2 Gg CH4/yr). Weighted EF
derived from this table is 1.2 kg CH4/head/yr,
and this value should be used instead of the
default (1.6 kg CH4/head/yr) in IPCC Software
3B.61
62Low level of data availability CH4 emissions
frommanure management for Swine (default AD and
EF) (1)
3B.62
63Low level of data availability CH4 emissions
frommanure management for Swine (default AD and
EF) (2)
Liquid/slurry was assumed to be the only system
used. GPG2000 provides slightly different default
values (Table 4.10), as well as a formula for
accounting for recovery, flaring, and use of
biogas.
Total emissions estimated were similar to those
using tier 1 (2.4 Gg CH4/yr). Weighted EF derived
from this table is 1.7 kg CH4/head/yr, and this
value should be used instead of the default (1.6
kg CH4/head/yr) in IPCC Software,
3B.63
64Low level of data availability results
3B.64
65Medium level of data availability
- Assume the country has good statistics on
livestock population to develop an enhanced
characterization with CS AD, but has to use
default EFs - Non-Dairy Cattle Same 18 classes as for enteric
fermentation - Assume that 50 of manure from feedlot has
liquid/slurry management system, and 50
anaerobic lagoons - Swine 18 classes are identified and quantified,
based on combination of - Two climate regions
- Three manure management systems
- Three swine population categories
66Medium level of data availability (Swine)
New Total 1,505,000 heads (FAO 1,500,000)
3B.66
67Tier 2 estimation of CH4 from manure management
by non-dairy cattle, swine
- Next slides will show examples of detailed
calculations for tier 2 method estimation of CH4
emissions from manure management by - Non-dairy cattle under Warm RegionExtensive
Grazing system - Swine under TemperateLiquid/Slurry system
68Medium level of data availability CH4 manure
management, non-dairy cattle under Warm,
Intensive Grazing (CS-AD) (1)
GE is used for determining VS. If these data
are not available, default VS values are provided
in Table B-1, p. 4.40 IPCC-GL.
3B.68
69Medium level of data availability CH4 manure
management, non-dairy cattle under Warm,
Intensive Grazing (CS-AD) (2)
In this case, the country has its own estimation
for feed/gross energy intake, feed digestibility,
and animal population for each of the different
classes of non-dairy cattle. For Bo, even though
the country has no locally developed studies,
IPCC default was adjusted for local conditions
following expert judgement. For other factors
(ASH, MCF), IPCC default values were used.
3B.69
70Medium level of data availability CH4 manure
management, swine under Warm, Liquid/Slurry
(CS-AD) (1)
3B.70
71Medium level of data availability CH4 manure
management, swine under Warm, Liquid/Slurry
(CS-AD) (2)
In this case, the country has its own estimation
for feed/gross energy intake, feed digestibility,
and animal population for each of the different
classes of non-dairy cattle. For Bo, even though
the country has no locally developed studies,
IPCC default was adjusted for local conditions
following expert judgement. For other factors
(ASH, MCF), IPCC default values were used.
3B.71
72Medium level of data availability EFs estimated
by tier 2 for non-dairy cattle, with CS AD
Weighted EF 3.2 kg CH4/head/yr Use this value in
IPCC Software
3B.72
73Medium level of data availability swine, EF
estimated by tier 2, with CS AD
Weighted EF 1.9 kg CH4/head/yr Use this value in
IPCC Software
3B.73
74Medium level of data availability results
Worksheet 4-1s1
Weighted EF
3B.74
75Manure ManagementN2O Emissions
76Manure management N2O
- Only tier 1 provided for this source. Steps
- characterization of livestock population
- determination of average N excretion rate for
each defined livestock category - determination of fraction of N excretion that is
managed in each MMS identified - determination of an EF for each MMS
- multiplication of total N excretion by EF, and
summation of all estimates - We will continue with the assumption of a
hypothetical country in Latin America, with same
animal characterization used for CH4 from manure
management (and also for enteric fermentation) - One numerical example, developed here
77Livestock characterization to estimate N2O
emissions from manure management
- Assume that only a small fraction of the manure
produced in the country undergoes some form of
management - Dairy and non-dairy cattle mostly grazing, with
urine/faeces deposited directly on soil (N2O
emissions accounted under Agricultural Soils) - Cattle in feedlots assumed to have liquid/slurry
(50) and anaerobic lagoon (50) management
systems - Swine a small fraction as liquid/sslurry or
anaerobic lagoons (Table 4.22 IPCC-GL V3) - Poultry all manure managed (60 with / 40
without bedding) (Table 4.13 GPG2000)
78Livestock characterization to estimate N2O
emissions from manure management
In case the country does not have this
information, IPCC-GL provides default AD for
different animal waste management systems (AWMS)
in different regions(Table 4-21 V3).
3B.78
79Determination of average N excretion per head for
identified livestock categories
- IPCC-GL (Table 4-20, V3) and GPG2000 (Table 4.14)
provide default values for Nex(T) for different
livestock species. Use of country-specific values
is recommended - County specific values can be obtained from
scientific literature or industry sources, or be
calculated from N intake and N retention data
according to equation 4.19 (GPG2000) - Assume the country decides to use
country-specific values to estimate Nex(T) for
non-dairy cattle only, and that default values
are used for all other categories
80Determination of country-specific average N
excretion per head for non-dairy cattle
- Assume that the country has information about
crude protein content of feed for the different
classes identified - Crude protein data are combined with feed intake
data (from the same livestock characterization
used for estimating CH4 emissions) to obtain N
intake - Assume that the country uses IPCC default value
for N retention in body and products (0.07 for
non-dairy cattle, GPG2000, Table 4.15)
81Livestock characterization for estimating N2O
emissions from manure management
MMS Manure management system L/S
Liquid/slurry AL Anaerobic lagoon
3B.81
82Determination of average N excretion per head for
non-dairy cattle
- Values estimated for Nex(T), using a combination
of country-specific and default data, ranged
between 47 and 63 kg N/head/yr for a population
of non-dairy cattle in feedlots, with a weighted
average of 56 kg N/head/yr. This value should be
introduced in IPCC software - This value is higher than the IPCC default for
Latin America (40 kg N/head/yr), which is based
on grazing cattle - Default values were used for the other species
83N2O from manure management use of IPCC software
to estimate total N excretion (1)
Estimated ?
IPCC Default ?
IPCC Default ?
Data from livestock characterization
3B.83
84N2O from manure management use of IPCC software
to estimate total N excretion (2)
Calculated ?
IPCC Default ?
IPCC Default ?
Data from livestock characterization
3B.84
85N2O from manure management use of IPCC software
to estimate total N excretion (3)
IPCC Default ?
Data from livestock characterization
3B.85
86N2O from manure management use of IPCC software
to estimate total N excretion (4)
IPCC Default ?
Data from livestock characterization
3B.86
87Use of IPCC software for estimating N2O from
manure management
IPCC Default ?
IPCC Default ?
IPCC Default ?
IPCC Default ?
IPCC defaults obtained from Table 4-22, IPCC-GL
V3, and Tables 4.12 and 4.13, GPG2000.
Note cells corresponding to poultry were
manually altered to accommodate these new
categories from GPG2000, not included in IPCC-GL.
3B.87
88Direct N2O Emissions from Agricultural Soils
89Mineral fertilizers
Animal manures
Fraction of (from the mass balance)
Anthropogenic N inputs to soils
Crop residues
Sewage sludges
N-fixing crops
Other practices dealing with soil N
Histosols cultivation
3B.89
90AGRICULTURAL SOILS
Assess individual contribution of different N
sources to determine ones (subcategories) which
are significant for the source category (25 or
more of source category N2O emissions)
For this, apply Tier 1a method and default values
to get an economic emission estimate
For the significant subcategories, the best
efforts should be invested to apply Tier 1b along
with country-specific AD1 and AD2 (parameters)
and country-specific emission factors
For non-significant subcategories, Tier 1a, along
with country-specific AD1, default AD2
(parameters) and default emission factors, is
acceptable
It is also acceptable to mix Tiers 1a and 1b for
different N sources, which will depend on the
activity data availability
3B.90
91Direct N2O Agricultural soils
- Assumption of the same hypothetical country
- We will assume that the country has the following
AD - usage of synthetic N fertilizers (FAO database)
- usage of synthetic N fertilizers for barley crop
(industry source) - estimate of EF1 for N applied to barley crops
(local research), which due to improved practices
in this crop (e.g. fractioning of N
applications), is lower than the IPCC default EF - N excretion from different animal categories
under pasture/range/paddock AWMS (data from
previous example of N2O from manure management) - area devoted to N-fixing crops (FAO database)
- The country has no organic soils (histosols)
- Direct N2O emissions are estimated using a
combination of Tier 1a (for most of the sources)
and Tier 1b (for use of N fertilizers in barley
crop and N in crop residues)
92Use of N fertilizers
From the FAO database
1 Barley data from industry sources, shown in
parentheses.
3B.92
93Direct N2O Agricultural soils
- From FAO database, only total country data for
fertilizer use are available. Therefore, only
Tier 1a method could be used - Data from barley industry/research can be used to
apply Tier 1b method - to ensure consistency, it is recommended to
compare crop area and crop yield data from FAO
with data from local industry - in this case, the two sources reasonably matched
in terms of area and yield, and it can be assumed
that the industry estimation of N fertilizer
usage is compatible with the FAO N fertilizer
data - from previous table, it can be derived that
19,000 t N fertilizer were applied to barley
crops, and 111,000 t N fertilizer to the rest
(130,000 minus 19,000) - from local research, EF1 was estimated to be 0.9
for fertilizer applied to barley crops in the
country - Since there are no organic soils in the country,
EF2 is not needed - Emissions from grazing livestock are included
here. Note that the GPG2000 includes this source
under manure management
94Synthetic fertilizersdetermination of FSN and
EF1
- FSN annual amount of fertilizer N applied to
soils, adjusted by amount of N that volatilizes
as NH3 and NOx - To adjust for volatilization, use IPCC default
value from Table 4-17, IPCC-GL, V2 0.1 kg
(NOxNH3)-N/kg fertilizer-N - It is determined that
- FSN 19,000 (1-0.1) 17,100 t fertilizer-N
(barley) - FSN 111,000 (1-0.1) 99,900 t fertilizer-N
(all other crops) - Total fertilizer-N 117,000 t fertilizer-N
- EF1 is 0.9 for barley (country specific) and
1.25 for the other crops (Table 4.17, GPG2000) - For the purpose of filling the IPCC software
sheet 4-5s1, a weighted EF1 is calculated as
follows - EF1 weighted average 17.1/117 (0.9)
99.9/117 (1.25) 1.20 - From worksheet 4-5s1, the annual emission of
N2O-N from use of synthetic fertilizer was
estimated as 1.40 Gg N2O-N
95Emissions of N2O from synthetic fertilizers
Combined EF (CS and default)
3B.95
96Manure applied to soilsdetermination of FAM
- FAM annual amount of manure N applied to soils,
adjusted by amount of N that volatilizes as NH3
and NOx - To calculate amount of manure N applied to soils,
use total amount of manure produced (using
livestock characterization previously applied to
other sources) and subtract the amounts used for
fuel, feed and construction (here assumed to be
zero) and those deposited on soils by grazing
livestock (whose emissions are reported
separately as direct emissions) - To adjust for volatilization, use IPCC default
value from Table 4-17, IPCC-GL, V2 0.2 kg
(NOxNH3)-N/kg animal manure N - It is determined that
- FAM 24,924 t animal manure N applied to soils
- Next two slides illustrate the use of IPCC
software to estimate FAM (named as FAW in
IPCC-GL) and estimation of an annual emission of
N2O-N from application of animal manure to soil
of 0.31 Gg N2O-N
97Emissions of N2O from animal manure (1)
Countrys estimate
From Table 4-17 IPCC Guidelines V2
Data from livestock characterization
3B.97
98Emissions of N2O from animal manure (2)
IPCC default
3B.98
99N-fixing cropsdetermination of FBN
- FBN amount of N fixed by N-fixing crops
cultivated annually (in our case, soybeans) - To calculate amount of N fixed, we assume that
there are no crop-specific values for
grain/biomass ratio or for moisture content of
biomass therefore, default data are used - Grain production is estimated from FAO statistics
(457,842 t/yr) - N content of biomass (FracNCRBF) is obtained from
Table 4.16 (GPG2000) 0.023 kg N/kg dry biomass - Residue/crop product ratio is 21, and dry matter
fraction is 0.85 (from same table as above) - It is determined (by using equation 4.26,
GPG2000) that - FBN 27,748 t fixed-N
- This value is introduced in IPCC software
worksheet 4-4s1 to estimate an annual emission of
N2O-N from N-fixing crops of 0.35 Gg N2O-N
100Emissions of N2O from N-fixing crops
Estimated activity data
IPCC default
3B.100
101Crop residuesdetermination of FCR
- FCR amount of N in crop residues returned to
soil annually - It is estimated by adjusting the total amount of
crop residue N produced to account for the
fraction that is burned in the field and for the
fraction that is removed from the field - We assume that the country has enough data to
apply Tier 1b method (equation 4.29 in GPG2000) - It is determined that
- FCR 37,934 t N in crop residues that are
returned to soils - This value is introduced in sheet 4-5s1 of the
IPCC software to estimate an annual emission of
N2O-N from N in crop residues of 0.47 Gg N2O-N - IPCC Software worksheet was designed for Tier-1a
method, and use of Tier 1b requires manually
altering sheet 4-5s1, cell C23
102Crop residues determination of FCR
- Source FAO statistics
- Source Table 4.16, GPG2000 (except FracDM for
potatoes, which was estimated by experts) - Source Country-specific data
FCR
3B.102
103N2O emissions from N in crop residues
IPCC default
Total direct N2O emissions (excluding pasture,
range and paddock) 2.54 Gg N2O-N/yr
3B.103
104N excretion from pasture/range/paddock
Default values
3B.104
105N2O emissions from pasture/range/paddock
From Table 4-8 IPCC Guidelines V2
3B.105
106Indirect N2O Emissions from Agricultural Soils
107Indirect N2O Agricultural soils
- We will continue with the assumption of a
hypothetical country in Latin America - We will assume that the country only covers the
following sources - N2O(G) from volatilization of applied synthetic
fertilizer and animal manure N, and its
subsequent deposition as NOx and NH4 - N2O(L) from leaching and runoff of applied
fertilizer and animal manure - Indirect N2O emissions are estimated using Tier
1a method and IPCC default emission factors - The next slides show calculations as performed by
IPCC Software
108Indirect N2O emissions from atmospheric
depositions
From Table 4.18 GPG2000
Default value
From Table 4-17 IPCC Guidelines V2
3B.108
109Indirect N2O emissions from leaching and runoff
From Table 4-17 IPCC Guidelines V2
From Table 4.18 GPG2000
3B.109
110Field Burning of Crop Residues
111Burning of crop residuesMain issues derived from
the decision tree
- If not occurring, then emission estimates are
NO - If occurring, then emissions must be estimated
using worksheet 4-4 sheets 1-2-3 (IPCC software) - Only one method is available to estimate
emissions from this source category - If key source, then country-specific values for
non-collectable AD and emission factors must
preferrably be used (default values for key
sources are possible if the country cannot
provide the required AD or financial resources
are lacking) - If country-specific values are used, they must be
reported in a transparent manner
112Burning of crop residues
- Activity data required to estimate emissions
- collected by statistics agencies annual crop
production (alternate way is FAO database)
- not collected by statistics agencies
- residue to crop ratio
- dry matter fraction of biomass
- fraction of crop residues burned in field
- fraction of crop residues oxidized
- C fraction in dry matter
- Nitrogen/carbon ratio
- Emission factors C-N emission ratios as CH4, CO,
N2O, NOX
- Other constants (conversion ratios)
- C to CH4 or CO (16/12 28/12, respectively)
- N to N2O or NOX (44/28 46/14, respectively)
1131. OPEN THE IPCC SOFTWARE AND CHOOSE THE YEAR OF
THE INVENTORY 2. CLICK 0N SECTORS IN THE MENU
BAR, AND THEN CLICK ON AGRICULTURE 3. OPEN SHEET
4-4s2
Main residue-producing crops Cereals (wheat,
barley, oats, rye, rice, maize,
sorghum) Sugarcane Pulses (peas, beans,
lentils) Potatoes, peanut, others
Identify the existing residue- producing crops
114Field burning of crop residues Worksheet 4-4,
sheet 1 Flowchart to be applied to each crop
Priority order for collectable AD1 1. Values
collected from published statistics 2. If not
available, values can be derived from a) crop
area (in kha)b) crop yield (in tonne/ha) 3. From
FAO DB
A. Annual crop production (Gg)
Priority order for non-collectable AD2 1. CS
values - research 2. CS values -
expert judgement 3. Values from countries with
similar conditions 4. Default values (search EFDB)
B. Residue/crop ratio
C. Quantity of residues (Gg biomass)
115Field burning of crop residues Worksheet 4-4,
sheet 1 Flowchart to be applied to each crop
Priority order for non-collectable AD 1. CS
values - research 2. CS values -
expert judgement 3. Values from countries with
similar conditions 4. IPCC default values (search
EFDB)
C. Quantity of residue (Gg biomass) from previous
slide
D. Dry matter Fraction
E. Total quantity of dry residue (Gg dm)
116Field burning of crop residues Worksheet 4-4,
sheet 1 Flowchart to be applied to each crop
E. Quantity of dry residue (Gg dm) from previous
slide
Priority order for non-collectable AD 1. CS
values - research 2. CS values -
expert judgement 3. Values from countries with
similar conditions (no default values)
F. Fraction burned in fields
For default values, search EFDB as combustion
efficiency
G. Fraction oxidized
To avoid double counting, a mass balance of crop
residue biomass must be internally
performed Fburned Total biomass (Fremoved
from the field Featen by animals Fother uses)
H. Total biomass burned (Gg dm burned)
1174. OPEN SHEET 4-4s2 OF AGRICULTURE UNDER
SECTORS
3B.117
118Field burning of crop residues Worksheet 4-4,
sheet 2 Flowchart to be applied to each crop
H. Biomass burned (Gg dm burned) from previous
slide
Priority order for non-collectable AD 1. CS
values - research 2. CS values -
expert judgement 3. Values from countries with
similar conditions 4. Default values (search EFDB)
I. C fraction in residue
J. C released (Gg C)
K. N/C ratio
Total C and N released are obtained by addding
the values obtained per each individual crop
L. N released (Gg N)
1195. OPEN SHEET 4-4s3 OF AGRICULTURE UNDER
SECTORS
Worksheet 4-4, sheet 3
Total emission estimates
3B.119
1206. GO TO THE OVERVIEW MODULE 7. OPEN THE
WORHSHEET 4-S2
Total emission estimates
3B.120
121Field burning of crop residues Worksheet 4-4,
sheet 3 Flowchart to be applied to aggregated
figures
EFs If no CS values, use defaults (Table 4-16,
Reference Manual, Rev. 1996 IPCC Guidelines)
P CH4 emitted (Gg CH4)
Total C released (Gg C from all crops) from
previous slide
P CO emitted (Gg CO)
C-N emitted (Gg C emitted as CH4 or CO Gg N
emitted as N2O or NOX)
M Non-CO2 emission rates (search EFDB)
O Conversion ratios
P N2O emitted (Gg N2O)
P NOX emitted (Gg NOX)
Total N released (Gg N from all crops) from
previous slide
3B.121
122Field burning of crop residues
Emission factors
3B.122
123Field burning of crop residuesEmission estimates
using country-specific valuesWheat residues (1
of 3)
AD from national statistics
CS activity data, from research and monitoring
3B.123
124Field burning of crop residues Emission
estimates using country-specific valuesWheat
residues (2 of 3)
CS activity data, from research and monitoring
125Field burning of crop residues Emission
estimates using country-specific valuesWheat
residues (3 of 3)
CS values for CH4/N2O D for CO/NOX
126Field burning of crop residues Emission
estimates using default valuesWheat residues (1
of 3)
AD 1. from national statistics, or 2. from FAO
database (www.fao.org, then FAOSTAT- Agriculture
and Crops primary)
CS value, from monitoring or expert judgement
Activity data, taken from EFDB
3B.126
127Field burning of crop residuesEmission estimates
using default valuesWheat residues (2 of 3)
Default activity data, from EFDB
128Field burning of crop residuesEmission estimates
using CS valuesWheat residues (3 of 3)
Default values, from EFDB
129Field burning of crop residues Differences in
emission estimatesif country-specific or default
values are used
130Prescribed Burning of Savannas
131PRESCRIBED BURNING OF SAVANNAS
Main issues derived from the Decision-tree
- If not occurring, then no emission estimates
- If occurring, then emissions must be are
estimated - using Worksheet 4-3, sheets 1-2-3 (IPCC
software)
- Only one methods is available to estimate
emissions - from this source category
- If key source, country-specific non-collectable
activity - data and emission factors must be preferred to
be used - (use of default values for key source is
possible, if the country cannot - provide the required AD or resources are
jeopardised)
- If CS values are used, they must be reported in
a - transparent manner
132PRESCRIBED BURNING OF SAVANNAS
- Activity data required to estimate emissions
- collected by statistics agencies
- division of savannas into categories
- area per savanna category
- not collected by statistics agencies
- biomass density (kha) (column A in worksheets)
- dry matter fraction of biomass (ton DM/ha)
(column B) - fraction of biomass actually burned (column D)
- fraction of living biomass actually burned
(column F) - fraction oxidised of living and dead biomass
(column I) - C fraction of living and dead biomass (column K)
- Nitrogen/carbon ratio
- Emision factors C-N emission ratios as CH4, CO,
N2O, NOX
- Other constants (conversion ratios)
- C to CH4 or CO (16/12 28/12, respectively)
- N to N2O or NOX (44/28 46/14, respectively)
133- OPEN THE IPCC SOFTWARE AND CHOOSE THE YEAR OF THE
INVENTORY - GO TO THE MENU BAR AND CLICK IN SECTORS AND
THEN IN AGRICULTURE - OPEN THE SHEET 4-3s1
- FILL IN WITH THE DATA
The first 3 steps is to determine 1. the
categories of savannas existing per ecological
unit 2. the area burned per category 3. the
biomass density per category
Sources for AD on categories of savannas and area
covered by category 1. National statistics 2.
National mapping systems Sources for AD on
biomass density 1. National statistics 2.
National vegetation surveys and mapping 3.
National expert judgement 4. Data provided by
third countries with similar features 5. IPCC
defaults (Table 4-14, Reference Manual,
1996 Revised Guidelines)
134PRESCRIBED BURNING OF SAVANNAS
Flow chart to estimate non-CO2 emissions
To be applied to each savanna category
B Biomass density (ton dm/ha)
D F actually burned
C Total biomass exposed to burning (Gg dm)
Ideally, CS values based on measurements. If not,
CS values based on expert judgement. If not,
default values (search EFDB)
A Area burned (k ha)
E Biomass actually Burned (Gg dm)
F F of living biomass burned
G Living biomass actually burned (Gg dm)
H Dead biomass actually burned (Gg dm)
1355. GO SHEET 4-3s2 IN SECTORS/AGRICULTURE OF THE
IPCC SOFTWARE 6. FILL IT WITH THE DATA
136PRESCRIBED BURNING OF SAVANNAS
Flow chart to estimate non-CO2 emissions
Applicable per each savanna category
If no CS values, defaults in EFDB, as combustion
efficiency
I1 Fraction of living biomass oxidised (Gg dm)
N Total N released (Gg N)
G Living biomass actually burned (Gg dm) from
previous slide
M N/C ratio
K1 C fraction of living biomass
J1 Oxidised living biomass (Gg dm)
L Total C released (Gg C)
H Dead biomass actually burned (Gg dm) from
previous slide
L1 C released from living biomass (Gg C)
J2 Oxidised dead biomass (Gg dm)
I2 Fraction of dead biomass oxidised (Gg dm)
L2 C released from dead biomass (Gg C)
K2 C fraction of dead biomass
1377. GO TO SHEET 4.3s3 IN SECTORS/AGRICULTURE 8.
FILL IT GO THE DATA
TOTAL EMISSION ESTIMATES
1389. GO TO OVERVIEW MODULE 8. OPEN THE WORKSHEET
4S2
Total emission estimates From Savanna Burning
139PRESCRIBED BURNING OF SAVANNAS
Applicable to aggregated figures
If no CS EFs, defaults in EFDB
O N2O NOx emission rates
R N2O emitted (Gg N2O)
P N2O-N released (Gg N)
N Total N released (Gg N) from previous slide
R NOx emitted (Gg NOX)
P NOx-N released (Gg N)
Q N2O NOx conversion rates
O CH4 CO emission rates
R CH4 emitted (Gg CH4)
L Total C released (Gg C) from previous slide
P CH4-C released (Gg C)
R CO emitted (Gg CO)
P CO-C released (Gg C)
Q CH4 CO conversion rates
140PRESCRIBED BURNING OF SAVANNASExamples of
default emission factors
141PRESCRIBED BURNING OF SAVANNAS
- Example based in a ficticious country having
- three ecological regions north, centre,
south - Northern zone shortest drought period
- Southern zone longest drought period
- Central zone intermediate situation
- Two scenarios
- use of country-specific values for the majority
of the ADs and EFs - use of default values for all the ADs and EFs
142PRESCRIBED BURNING OF SAVANNASEmission estimates
using CS values
CS values (field measurements, experts judgement)
AD from national statistics (census, surveys,
mapping)
143PRESCRIBED BURNING OF SAVANNASEmission estimates
using CS values
CS values (field measurements, lab analysis,
experts judgement)
144PRESCRIBED BURNING OF SAVANNASEmission estimates
using CS values
CS values for CH4 N2O D values for CO NOx
145PRESCRIBED BURNING OF SAVANNASEmission estimates
using default values
AD from national statisitcs
Default values taken from EFDB
146PRESCRIBED BURNING OF SAVANNASEmission estimates
using default values
Default values taken from EFDB
CS values taken from experts judgement
147PRESCRIBED BURNING OF SAVANNASEmission estimates
using default values
Default values taken from EFDB
148PRESCRIBED BURNING OF SAVANNASDifference of
estimates
149RICE CULTIVATION
150RICE CULTIVATION
- Anaerobic decomposition of organic material in
flooded rice fields produces CH4 - The gas escapes to the atmosphere primarily by
transport through the rice plants - Amount emitted function of rice species,
harvests nº/duration, soil type, tº, irrigation
practices, and fertilizer use - Three processes of CH4 release into the
atmosphere - Diffusion loss across the water surface (least
important process) - CH4 loss as bubbles (ebullition) (common and
significant mechanism, especially if soil texture
is not clayey) - CH4 transport through rice plants (most important
phenomenon)
151RICE CULTIVATIONMethodological issues
- 1996 IPCC Guidelines outline one method, that
uses annual harvested areas and area-based
seasonally integrated emission factors (Fc EF x
A x 10-12) - In its most simple form, the method can be
implemented using national total area harvested
and a single EF - High variability in growing conditions (water
management practices, organic fertilizer use,
soil type) will significantly affect seasonal CH4
emissions - Method can be modified by disaggregating national
total harvested area into sub-units (e.g. areas
under different water management regimes or soil
types), and multiplying the harvested area for
each sub-unit by an specific EF - With this disaggregated approach, total annual
emissions are equal to the sum of emissions from
each sub-unit of harvested area
152RICE CULTIVATIONActivity data
- total harvested area excluding upland rice
(national statistics or international databases
FAO (www.fao.org/ag/agp/agpc/doc) or IRRI
(www.irri.org/science/ricestat/pdfs) - harvested area differs from cultivated area
according the number of cropping within the year
(multiple cropping) - regional units, recognising similarities in
climatic conditions, water management regimes,
organic amendments, soil types, and others
(national statistics or mapping agencies or
expert judgement) - harvested area per regional unit (national
statistics or mapping agencies) - cropping practices per regional unit (research
agencies or expert judgement) - amount/type of organic amendments applied per
regional unit, to allow the use of scaling
factors (national statistics or international
databases or expert judgement)
153RICE CULTIVATIONMain features from decision-tree
(1)
- If no rice is produced, then reported as NO
- If not key source
- and cropped area is homogeneous, then emissions
can be estimated using total harvested area (Box
1) - but cropped area in heterogeneous, then total
harvested area muts be disaggregated into
homogeneous regional units applying default EF
and scaling factors, if available - If keysource
- and the cropped area is homogeneous, then
emissions must be estimated using total harvested
area and CS EFs (Box 2) - but cropped area variable, then the total
harvested area must be divided into homogeneous
regional units and emiss