Title: FOREST ESTATE PLANNING
1FOREST 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)
2Simple 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
3Simple Forest-level Problem
- WORK THROUGH SIMPLE HARVEST PROBLEM IN EXCEL
(based on DJ p. 276)
4Introduce More Complexity
- multiple Prescriptions
- Regenerated Stands
- more time periods
- more constraints
- WORK THROUGH PICKETT HARVEST SCHEDULING PROBLEM
(based on DJ, p. 583)
5PICKETT FOREST (Davis Johnson Chpt. 11)
6MODELLING PRESCRIPTIONS AND YIELDS
- EXISTING AND REGENERATED STANDS
- VOLUMES CUT AT HARVEST
- CLEARCUT AND THINNED ACRES
- INVENTORIES
7Prescription 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.
8EXISTING STAND YIELDS (CCF/ACRE)
OBJECTIVE IS TO CUT EXISTING STANDS WITHIN 40
YEARS, OR LEAVE THEM AS PARK
9REGENERATION STAND YIELDS FROM CLEARCUT
(CCF/ACRE)
R30 YEARS
R40 YEARS
R40 YEARS
10REGENERATION STAND YIELDS FROM THINNING
(CCF/ACRE)
THIN AT 20 YEARS AGE
11EACH COLUMN GIVES A FULL TREATMENT
PRESCRIPTION FOR AN ACRE OF LAND OVER THE
PLANNING HORIZON
12SUM THE HARVEST VOLUME YIELDS IN EACH PERIOD
INTO TOTAL HARVEST VARIABLES
THESE ROWS 0 on the RHS
13SIMILAR DECISION VARIABLES FOR EACH STAND,
PRESCRIPTION AND TIMING CHOICE
14ADD ROWS (and variables) FOR TOTAL ACRES CUT BY
PERIOD
15ADD ROWS (and variables) FOR THINNED ACRES BY
PERIOD
16ADD INVENTORY ROWS (VOLUME / ACRE AFTER HARVEST)
17SUM INVENTORIES INTO TOTALS FOR EACH PERIOD
0 on the RHS
18MODELLING POLICY
- HARVEST FLOW CONSTRAINTS
- INVENTORY CONSTRAINTS
- CASH FLOW CONSTRAINTS
- NON-TIMBER CONSTRAINTS
- SILVICULTURE/PRESCRIPTION LEVELS
19HARVEST FLOW CONSTRAINTS (SEQUENTIAL)