. TRIM timber projections : an evaluation based on forest inventory measurements. Forests and forestry Mensuration Mathematical models; Forest surveys North Carolina. - - - Growth and reduced harvest. 1974 1984 1994 2004 2014 2024 Figure 6—Survey unit 3 inventory projections with reduced harvest and FIA measurements representing the natural pine type in nonin- dustrial private ownership in North Carolina. Discussion As the results show, all inventory and growth projections nnade by use of the fully stocked empirical yield tables failed to meet the first criterion. Most projections
. TRIM timber projections : an evaluation based on forest inventory measurements. Forests and forestry Mensuration Mathematical models; Forest surveys North Carolina. - - - Growth and reduced harvest. 1974 1984 1994 2004 2014 2024 Figure 6—Survey unit 3 inventory projections with reduced harvest and FIA measurements representing the natural pine type in nonin- dustrial private ownership in North Carolina. Discussion As the results show, all inventory and growth projections nnade by use of the fully stocked empirical yield tables failed to meet the first criterion. Most projections made from the growth yield tables met the "successful" criterion. Growth yield tables pro- duced more growth than did empirical yield tables, and higher inventories were thus maintained. At the State level, all projections were better than the empirical yield simulations, but the first criterion was not met until harvest was reduced. For the survey unit, all projections of inventory met the first criterion. The results show that projected growth was insensitive to the level of harvest used. As the harvests were reduced, total growth remained about the same, whereas pro- jected inventory volumes increased by the change in harvest volume. The mode! was regenerating pine after han/est, and this indicates that regenerated pine was pro- jected to grow at the same rate as the pine being harvested. Growth declined when natural pine acreage was removed from the land base and not regenerated. In the long term, growth increased as the level of harvest caused a shift in the stand struc- ture to younger, faster growing, age classes. Harvest occurred in a range of age classes. If harvest had been shifted to the oldest age class (slower growing), a reduction in harvest would have caused a reduction in total growth. 13. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these ill
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