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宜川县的油松人工林大多是60年代初营造起来的,目前约有2400多公顷已经郁闭,1000ha 已进入抚育间伐期。为了充分发挥林地生产力,培育速生丰产油松林,特进行了不同采伐强度试验。试验设在铁龙湾林场富曲营林区。林龄27年,采伐试验分四种不同强度,不采伐为对照,不同采伐强度标准地,伐前与伐后密度皆不相同。1983年采伐,伐前测定标准地林木平均胸径、树高、单位面积蓄积量,1989年复测各标准地林木生长因子,并进行对比分析,结果为:不同采伐强度及不同保留密度对林分高生长影响不大,对胸径和材积生长影响差异明显,见表。
Most of the Pinus tabulaeformis plantations in Yichuan County were built in the early 1960s. At present, about 2,400 hectares have been closed and 1000ha have been undergoing tending and house-cutting periods. In order to give full play to the productivity of woodland and cultivate fast-growing and high-yielding Pinus tabulaeformis, different harvesting intensities were tested. Test in Tie Longwan Forest Farm Qu Quoying forest. 27 years of forest age, harvesting test is divided into four different intensities, not cutting as a control, different harvesting intensity standard, before and after cutting densities are not the same. In 1983, the average DBH, tree height and stock volume per unit area of the standard trees in logging and cutting before cutting were measured. The forest growth factors in each standard were retested in 1989 and analyzed comparatively. The results were as follows: different harvesting intensity and different reserve density High growth has little effect on the DBH and volume growth significantly different, see table.