Report of St' Petersburg Team

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INTAS 01-0633 SILVICS

• Report of St. Petersburg Team
• O.G. Chertov, M.A. Nadporozhskaya E.V. Abakumov
• Biological Research Institute
• St. Petersburg State University
• 2005

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Introduction

• A close cooperation with the Pushchino and
  Fraunhofer teams
• Development of a theoretical background for the
  SOM model
• Incorporation of a new experimental data into the
  models
• Formulation a new version of ROMUL model
• Test the models for different spatial scales

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The laboratory experiments

• Impact of biochemical parameters of plant debris
  on the rate of their decomposition
• Impact of the disposition of decomposing matter
  (pure or in mixture with different soil material)
  to specify difference of above-ground and
  below-ground litter decomposition and patterns of
  decomposition in organic layers
• Specification of nitrogen mineralisation in
  dependence on SOM and soil properties

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The field works include Experiments on
decomposition of forest litter fall of different
quality in the forestA study of SOM
accumulationin a process of primary soil
formation
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Theoretical analysis of the decomposition process
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Model of SOM and N dynamics ROMUL

• The model is based on a classical concept of
  humus type (Humusform)
• Experimental base for the model compilation is
  published and authors data on organic debris
  decomposition in controlled conditions
• The rate of litter and SOM humification and
  mineralisation is dependent on quality of litter,
  soil temperature and moisture, and some soil
  physical and chemical parameters
• There is a specification of rate variables for
  above and below ground litter cohorts
• The model calculates the dynamics of organic
  matter and nitrogen during the decomposition with
  gross CO2 and available N evaluation
• The model was evaluated against the long-term
  experimental data
• The model is in use as a soil compartment in
  three forest ecosystem models

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Flow chart of ROMUL model
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Elaboration of a new ROMUL version

• A large set of experimental data for SOM
  decomposition allows for a revision of ROMUL
  model
• The kinetic coefficients of litter and SOM
  mineralisation were re-calculated using
  Bleasdale function and a special program (A.S.
  Komarov and M.A. Nadporozhskaya)
• This allowed to specify the mineralisation rate
  in two sub horizons of forest floor (F and H) and
  a peat
• A structure and test program of a new version of
  ROMUL model was compiled and preliminary tested

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Calculation of kinetic coefficients of organic
debris mineralisation and humification
Stage of fast decomposition reflects a
mineralisation of fresh organic debris
The function of Bleasdale was used for
approximation of experimental curves y (a
bt) - 1/c or y (a bt)1/c
Stage of slow decomposition represents a
mineralisation of humified organic debris - not
the material with increased concentration of
lignin only
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Flow chart of a new version of ROMUL model
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The use of forest ecosystem model EFIMOD for
research and practical implementation at forest
stand, local and regional levels

• Recently, the idea on the necessity to have a
  cascade of forest ecosystem models with a
  different spatial resolution was dominated in the
  terrestrial ecosystem modelling
• Now there are technical opportunities allowing
  for a use of one basic model type at any spatial
  levels without the loss of information obtained
  at the lower levels
• Some results of and prospects for the
  implementation of one basic model type to cover
  different spatial scales in forest ecosystem
  modelling were investigated

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Methods and Material

• Standard EFIMOD simulations of a single stand
  growth and soil changes were performed for the
  model use at different scales
• Individual tree growth
• Stand level effects
  of environmental changes thinning regimes
• Local (landscape) level
  silvicultural regimes in forest enterprise (case
  studies)
• Regional level
  soil carbon dynamics for a large forest area

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Individual tree growth
Trajectories of individual tree growth on 25-m
transect in a modelled Norway spruce stand
Map of individual trees disposition on the
modelled plot
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Hierarchy of spatial scales for the application
of a stand level model
Stand level Parameters of individual trees
growth Stand/soil parameters in detail No
generalised parameters for forest area
Local/landscape level Optionally parameters of
individual tree growth Stand/soil parameters in
details Generalised parameters of any format for
forest area
Regional level No parameters of individual tree
growth Optionally stand/soil parameters in full
details Generalised parameters of any format for
forest area
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The results of EFIMOD runs at different scales
shows that

• The application of one basic stand-level forest
  model for different spatial scales has positive
  prospects for its further development
• At local and regional levels, this approach was
  used by Chumachenko et al. (2003 ForRus), Ho et
  al. (1999 LANDIS), Garman (2004), Kurz Apps
  (1999 CBM-CFS2) and Nabuurs et al. (2003
  EFISCEN)
• The approach can be an additional methodological
  option that will be more effective for the
  practical implementation of the forest modelling
  for the realisation of the concept of Sustainable
  Forest Management

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Case study I and II Application of the
EFIMOD-Pro for the analysis of carbon balance at
different silvicultural regimes in forests of
Central European Russia
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Collaboration with Projects Teams

• Close co-operation with Pushchino and Fraunhofer
  teams
• Participation in the Case Study
• Participation in the interpretation and
  presentation of the results of geovisualisation
  and Exploratory Spatial Data Analysis (ESDA) for
  Case Study

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Links to other projects

• EU INTAS Project 01 512 Podzol
• St. Petersburg State University Project Changes
  of Soils and Soil Cover under Anthropogenic
  Factors
• Russian Federal Science and Technology Program
  Global Climate Changes and Carbon Cycle, part
  14 Soil as a source of greenhouse gases

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Publications for the period 2002-2005
International journals Published 4 Submitted
3 Proceedings and national journals Published
7 Submitted 3 Abstracts to conferences
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21 presentations at international and national
scientific meetings for the period May 2002 -
February 2005
Pushkin, SPB (3) Gent(1)DSS Vienna (3), Uni
Hohenheim (1) Trippstadt Forest Station (1)
Pushchino (3),Kazan (2),Quebec (1)ForMod
Vienna (3)ECEM 04 (2)
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Acknowledgements
The participants of SPBU team acknowledge
colleagues from other teams of the Project, the
Administration of the Biological Institute, the
Department of Soil Science and Soil Ecology of
St. Petersburg State University and the
Dokuchaev Soil Museum for their active
collaboration and valuable help