抚育间伐对杉木单株材积生长的影响

Effects of intermediate cutting on biomass growth of Cunninghamia lanceolata forests

依托中央财政森林抚育补贴项目,在湖南省境内设置抚育样地及其对照样地共8组合计16个样地,包括杉木中龄林和近熟林,连续4年观测其胸径、树高的生长情况,分析抚育对杉木胸径、树高生长的影响,对抚育成效进行评价,以期为进一步做好森林抚育工作提供科学依据。主要研究结果如下:抚育样地杉木单株材积生长量明显大于对照样地。单株材积年均生长量A1(攸县)最大为0.0273 m3·a-1,排序为A1(攸县)>D1(金洞区)>H1(岳阳县)>B1(苏仙区)>G1(岳阳县)>E1(金洞区)>C1(苏仙区)>F1(泸溪县);单株材积年均生长量抚育与对照的差值D(金洞区)最大为0.0088 m3·a-1,F(泸溪县)最小为0.0015m3·a-1。抚育对杉木的材积生长具有明显促进作用,平均抚育效益达到37.5%。抚育效益最高的金洞区E组样地,抚育效益大于60.0%,抚育效益最低为攸县样地,抚育效益不足10.0%。

This research is based on the central finance forest tending subsidy pilot project, with the tending sample and the same as a group, set up 8 groups of samples in the range of Hunan Province, Including middle age and near mature forest of Chinese fir, observing the effect of tending on the growth of trees for 4 years. The effects of tending on biomass per year were analyzed. To evaluate the effect of tending, so as to provide scientific basis for the further development of forest tending. The main results are as follows: The growth rate of individual tree volume was significantly higher than that of the control sample.The average annual growth of single plant volume A1(Youxian) is 0.0273 m3·a-1,and A1(Youxian) >D1(Jin Dong area) >H1(Yueyang) >B1(Suxian District) >G1(Yueyang) >E1(Jin Dong area) >C1(Suxian District) >F1(Luxi);the average annual growth of individual plant volume is the difference between tending and control D(Jin Dong area) up to 0.0088 m3·a-1, F(Luxi) minimum 0.0015 m3·a-1.Tending has a significant effect on the growth of Chinese fir, and the average tending benefit is 37.5%.The group with the highest benefit was found in the E formation of the Jin Dong area, tending to be more than 60%, and the tending benefit was the lowest in Youxian, less than 10%.