Laserfiche WebLink
<br />002888 <br /> <br />The implementing regulations of NFMA (36 CFR 219.27) provide direction for <br />MHR's. It includes: <br /> <br />a. <br />b. <br /> <br />Resource protection, <br />Vegetative manipulation, <br />Silvicultural practices, <br />Even-aged management, <br /> <br />e. <br />f. <br />g. <br /> <br />Riparian areas, <br />Soil and water, and <br />Diversity. <br /> <br />c. <br /> <br />d. <br /> <br />Further direction for incorporating the above into the reanalysis is located in <br />the Rocky Mountain Regional Guide, Chapter 3. The following discussion of each <br />explains how the Forest will meet the requirements. <br /> <br />1. Culmination of mean annual increment (CMAI) - Each timber yield table was <br />constrained so that it could be used only after the calculated 95 percent <br />of the culmination of mean annual increment had been reached. The age at <br />which stands reach CHAI varied depending on the species and intensity of <br />management. <br /> <br />2. Non-declining flow harvest schedule - Timber harvest was scheduled on a <br />non-declining flow basis (NDY) , unless justification for departure exists. <br />This approach allowed for increases in harvest levels over time but did not <br />permit reductions. When a non-declining flow harvest schedule was imposed, <br />harvest levels were equal to or less than the long-term sustained yield <br />capacity (LTSY). A non-declining flow harvest schedule does not, permit <br />harvest levels above the long-term sustained yield capacity. <br /> <br />3. Ending inventory constraint - This constraint ensured that sufficient <br />timber inventory remained at the end of the modeling horizon to sustain <br />timber harvest at the LRSY level. <br /> <br />4. Size of created openings and dispersion - (Forplan MHR) These constraints <br />were necessary to meet the requirements of 36 CFR 219.27(d). These <br />requirements state that when openings are created by application of <br />even-aged silviculture, individual cuts shall conform to the Regional Guide <br />direction on dispersion of openings and maximum size limits for areas to be <br />cut in one harvest operation. <br /> <br />Timber harvest units were limited in size. <br />exceed 40 acres. Clear cut timber harvest <br />to 5 acres to assure natural regeneration. <br /> <br />The size of an opening will not <br />units in spruce-fir were limited <br /> <br />Table C-O displays the dispersion constraints that were imposed on this <br />benchmark analysis. In this analysis, the constraints were applied to <br />spruce-fir, lodgepole pine, and aspen when there was the possibility that <br />openings would be created by commercial or non-commercial methods. The <br />percentages are "less than or equal to" constraints. The model is limited <br />to harvesting no more than the percentage of the given visual quality <br />objective (VQO) per decade. These constraints also help most resource <br />protective requirements related to water and soil. <br /> <br />21 <br />