杉木人工林降位间伐的综合经营效果分析

对杉木人工林降位间伐的综合经营效果进行分析,结果表明:在不增加森林资源消耗的情况下,降位间伐可增加出材率,增加材积为2.3547 m3·hm-2;有较好的经济效益,扣除投入成本,实际可增益1177元·hm-2;降位间伐与传统间伐一样能促进保留木的生长,有利于培育中、大径材。降位间伐与不间伐比,保留木平均胸径生长量增加51.0%,差异达显著水平,平均树高生长量增加15.5%,有差异,但未达显著水平。此外,降位间伐还能抑制伐桩萌芽,促进伐桩腐烂。因此,降位间伐在杉木人工林间伐时可大力推广应用。

The analysis on integrated management effect of thinning to reduce the occupation for Cunninghamia lanceolata plantations

The integrated management effects of thinning to reduce the occupation for Cunninghamia lanceolata plantations were analyzed.The results showed that in case of not increasing the forest resources consumption,thinning to reduce the occupation could increase the volume outturn rate and the increased volume of timber was 2.354 7 m3·hm-2.There were better economic benefits,for deducting the investment cost,its gain could reach 1 177 RMB·hm-2.The same as traditional thinning,thinning to reduce the occupation also could promote the growth of remaining trees and was beneficial to foster the large and medium-sized diameter timber.Thinning to reduce the occupation compared to no thinning,the average DBH increment was 51.0%,and the difference was significant.t level,and the average high increment was 15.5% which was differences but not significant.It also could inhibit sprouting from the cut stakes and promoting the rotting of the cut stakes.Thinning to reduce the occupation could be popularized and applied in Cunninghamia lanceolata plantations.