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FOREST ESTATE PLANNING

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Title: FOREST ESTATE PLANNING


1
FOREST ESTATE PLANNING
  • ESTATE / TIMBER SUPPLY PLANNING References
  • UBC Forestry Handbook, Chapter on Forest-level
    Planning
  • Davis, Johnson, Bettinger Howard, Forest
    Management, Chapters 6, 10 11
  • Buongiorno Gilless
  • Chapters 1-5 (good practice problems)

2
Simple Forest-level Problem
  • Maximize total harvests over 3 periods (each
    period10 years)
  • Subject to
  • minimum harvest/period 1500 mbf
  • Harvest in period t1 not to exceed -20 of
    harvest in period t (sequential flow)
  • Maximum acres cut/period 120
  • Maximum acres cut period in each stand (see
    table)
  • Sum of periodic treatments in stand i cannot
    exceed the total number of acres in stand i

3
Simple Forest-level Problem
  • WORK THROUGH SIMPLE HARVEST PROBLEM IN EXCEL
    (based on DJ p. 276)

4
Introduce More Complexity
  • multiple Prescriptions
  • Regenerated Stands
  • more time periods
  • more constraints
  • WORK THROUGH PICKETT HARVEST SCHEDULING PROBLEM
    (based on DJ, p. 583)

5
PICKETT FOREST (Davis Johnson Chpt. 11)
6
MODELLING PRESCRIPTIONS AND YIELDS
  • EXISTING AND REGENERATED STANDS
  • VOLUMES CUT AT HARVEST
  • CLEARCUT AND THINNED ACRES
  • INVENTORIES

7
Prescription 1 All sites Prepare site, plant,
clearcut at age 30. Prescription 2 Good Sites
Prepare site, plant, release, commercially thin
about 40 volume at age 20, clearcut at age 40.
Prescription 3 Good Sites Prepare site, plant
improved stock, prune, thin about 40 at age
20, clearcut at age 40.
8
EXISTING STAND YIELDS (CCF/ACRE)
OBJECTIVE IS TO CUT EXISTING STANDS WITHIN 40
YEARS, OR LEAVE THEM AS PARK
9
REGENERATION STAND YIELDS FROM CLEARCUT
(CCF/ACRE)
R30 YEARS
R40 YEARS
R40 YEARS
10
REGENERATION STAND YIELDS FROM THINNING
(CCF/ACRE)
THIN AT 20 YEARS AGE
11
EACH COLUMN GIVES A FULL TREATMENT
PRESCRIPTION FOR AN ACRE OF LAND OVER THE
PLANNING HORIZON
12
SUM THE HARVEST VOLUME YIELDS IN EACH PERIOD
INTO TOTAL HARVEST VARIABLES
THESE ROWS 0 on the RHS
13
SIMILAR DECISION VARIABLES FOR EACH STAND,
PRESCRIPTION AND TIMING CHOICE
14
ADD ROWS (and variables) FOR TOTAL ACRES CUT BY
PERIOD
15
ADD ROWS (and variables) FOR THINNED ACRES BY
PERIOD
16
ADD INVENTORY ROWS (VOLUME / ACRE AFTER HARVEST)
17
SUM INVENTORIES INTO TOTALS FOR EACH PERIOD
0 on the RHS
18
MODELLING POLICY
  • HARVEST FLOW CONSTRAINTS
  • INVENTORY CONSTRAINTS
  • CASH FLOW CONSTRAINTS
  • NON-TIMBER CONSTRAINTS
  • SILVICULTURE/PRESCRIPTION LEVELS

19
HARVEST FLOW CONSTRAINTS (SEQUENTIAL)
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