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<br />002893 <br /> <br />Maximum PNV with NDY 95% of CHAI and Endin Inventor Constraints Benchmark <br />No FE IS Benchmark Nos.) <br />(FORPLAN Run No.1) <br /> <br />Purpose: This benchmark determines the most economical level of outputs and <br />land allocation using market and assigned values, with constraints for <br />nondeclining flow and 95% CHAI. Other minimum management requirements are not <br />analyzed. <br /> <br />FORPLAN Objective function: Maximize PNV for fifteen decades. <br /> <br />Constraints: <br /> <br />-Timber harvest is scheduled only on lands classified as tentatively <br />suitable for timber production. <br /> <br />-Timber harvest can equal but not exceed the long-term sustained yield <br />capacity (LTSY). <br /> <br />~ <br /> <br />-Timber harvest levels can increase from decade to decade but not decline. <br /> <br />-Sufficient timber inventory must remain at the end of 150 years to sustain <br />timber harvest at the LTSY level. <br /> <br />-Regeneration cuts cannot be scheduled until stands have reached 95% of <br />culmination of mean annual increment. <br /> <br />-Regeneration harvests are dispersed to meet Regional guidelines for size <br />and separation of harvest units. <br /> <br />nificant features and results: The PNV over the 150-year modeling period is <br />2.3 billion dollars. There are 881,991 acres identified as suitable for <br />timber prOduction, with a long term sustained yield level of 23.505 MMCF (105.7 <br />MMBF) per year. During the first and second decade, the annual offer level is <br />14.5 MMCF (65.4 MMBF). In the third through fifth decade the level increases <br />to long run sustained yield for the rest of the modeling period. No aspen is <br />commercially harvested the first decade, although it is harvested in later <br />decades. <br /> <br />Table C-2 displays the resource output levels and budget requirements of this <br />benchmark. <br /> <br />26 <br />