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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.