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WOODLOT for Windows 2.1 - Reference Manual | ||
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11.4 Harvest Parameters Harvest Parameters set the basic minimum harvest planning parameters for harvest calculations. They apply to the whole woodlot. These can be revised to polygon specific harvest parameters in the View Yield window. Items include:
WOODLOT will set the harvest ages based on the higher of the harvest age selected in Polygon Data, or the age at which the above harvest parameters are met. Refer to section "9.3.2 View Existing Yield" page 9-42 for more information on polygon specific harvest parameters. 11.4.1 Done Button Once you have made changes, click the Done button to save changes and move to the Summary Screen. 11.4.2 Save Defaults Button If you would like to save the harvest parameters for use as defaults in all polygons, click on this button. Defaults will automatically update harvest parameters in the View Yield window. 11.4.3 Minimum DBH Enter the minimum diameter in cm when the stand can be harvested. 11.4.4 Minimum Volume Enter the minimum volume in m³/ha when the stand can be harvested. 11.4.5 Minimum Age Enter the minimum age in years when the stand can be harvested. 11.4.6 Regen Delay [Default] value is updated directly from harvest parameters. The regen delay specifies the number of years to wait after harvesting a block before restarting the growth on the yield table. A 0-regen delay assumes you will reestablish a fully stocked stand the same year you harvest. Normally you should allow 2 years. 11.4.7 Planning Horizon You can adjust the planning horizon used in WOODLOT with this feature. Normally this will be set to 250 years, based on MOF policy and as used in the TSR. 11.4.8 Partial Cut Adjustment Factor Enter in the adjustment factor to reduce or increase the expected volume recovered on re-entry for a partially cut stand. The acceptable range is 0.1-1.9, between. Enter 0.8 for 80% of the volume to be used (i.e. 20% removed). A partial cut adjustment factor (PCAF) is required to account for variability in in-growth in partially cut stands in WOODLOT. WOODLOT uses yield information derived from MOF yield models that are derived from clearcut or fully denuded stands. WOODLOT assumes that the new partially cut forest will be a thrifty fully stocked stand, but growing as if it were an immature stand. A partially cut stand will likely grow slower (or in some cases faster) over the first several years than a fully stocked immature stand would at the same age. To account for the variability, a PCAF has been introduced to scale the volume recovered on re-entry down (or up). The actual PCAF will vary by location. A PCAF of 0.8 has been selected for a default value. Users may wish to refer to PROGNOSIS BC for an estimate of the PCAF for their area. 11.4.9 Partial Cut - Re-entry Period Enter the period in years. Note that the actual reentry period will depend on the cue in which it will be harvested. The actual reentry may be delayed a few years while another polygon is being harvested. Acceptable range is 1-50 years. 11.4.10 Partial Cut - Percent to Harvest Enter the percent to be removed on the first entry. Note that the actual volume removed will depend on the cue in which it will be harvested. The actual reentry may be delayed a few years while another polygon is being harvested, thus generating a slightly higher in-growth yield. Acceptable range is 1-50 percent. The volume removed on subsequent entries will be the in-growth from the lowest residual volume level of the first entry. 11.4.11 Commercial Thin Parameters This feature is not enabled for this version of WOODLOT | ||
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