论文部分内容阅读
在１５ａ生水杉人工林内设立标准地，定量机械间伐，定期测定生长量，对抚育间伐７ａ后的效果及经济效益进行分析，结果表明：（１）不同初植密度的林分采用较小的强度ｐｎ＝２５％，３３％进行间伐，与对照林分相比，平均每公顷生长量分别提高５．９７，９．２７ｍ３，增加９．５７％，１４．８７％；采用较大强度ｐｎ＝５０％进行间伐，与对照林分相比，平均每公顷生长量下降９．７ｍ３，减少１５．５７％。（２）抚育间伐过的林分（间伐强度ｐｎ＝２５％，３３％，５０％）与对照林分相比，单位面积保留木平均生长率分别提高１．３４％，２．００％，１．９７％。（３）抚育间伐的林分与对照林分相比，平均每公顷总产值和利润分别增加６２７８，５７８４元，增长７．７％，９．５％。
In 15a aquatic fir plantation set up a standard, quantitative mechanical thinning, regular measurement of growth, after tending thinning 7a effect and economic analysis, the results showed that: (1) different planting density of the forest with a smaller intensity pn = 25% and 33%, respectively. Compared with the control stand, the average growth per hectare increased by 5.97 and 9.27 m 3, respectively, by 9.57% and 14.87%, respectively. %, And the average growth per hectare decreased by 9.7m3 and 15.57% compared with the control stand. (2) Tending thinning stand (thinning strength pn = 25%, 33%, 50%) Compared with the control stand, the average growth rate of reserved wood per unit area increased by 1.34%, 2.00%, 1 .97%. (3) Compared with the control stand, the average yield per hectare and profit increased by 6,278,5784 yuan, an increase of 7.7% and 9.5% respectively.