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首页> 美国政府科技报告 >Yields with and without Repeated Commercial Thinnings in a High-Site-Quality Douglas-fir Stand
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Yields with and without Repeated Commercial Thinnings in a High-Site-Quality Douglas-fir Stand

机译：在高品质道格拉斯冷杉林中有和没有重复商业稀释的产量

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A high-site-quality Douglas-fir stand was first thinned when about 57 years old and at 5-year intervals thereafter through approximately age 72. Before the stand was first thinned, it had about 150 stems per acre, with a mean d.b.h. of 17 inches. The thinnings evidently caused about a 10-percent reduction in gross growth per acre. On the other hand, 15-year diameter growth of surviving trees was 29 percent greater in thinned than in unthinned stands. As a result, if the final harvest is made 10 years after the last thinning, at about age 82, thinnings will have brought an estimated 5-percent increase in total usable production. It should be recognized that removal of volume in these thinnings will have resulted in about a 20-percent reduction in volume to be cut at that final harvest.

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