贵州雷公山甜槠栲群落生物量研究

Study on Biomass of Castanopsis eyrei(Champ.) Tutch.Community in Leigong Mountain of Guizhou

为了了解贵州雷公山甜槠栲群落生物量水平和结构,为贵州省常态地貌森林碳汇能力的估测提供依据。采用野外调查的方法进行群落调查,在此基础上测定群落各生物量,同时以生物量和测树因子的实测数据建立估测回归方程。结果表明,群落内共有植物69种,其物种多样性丰富,群落建群种为甜槠栲。生物量在垂直结构上的分配情况是:乔木层(83.38%)>灌木层(15.25%)>草本层(1.37%),乔木层的平均生物量为46.31t/hm2,灌木层为8.47t/hm2,草本层为0.76t/hm2。乔木层各组分生物量的大小顺序为干材(62.10%)>树枝(21.36%)>树叶(11.79%)>树皮(4.75%)。乔木层各组分生物量和总生物量与测树因子胸径-树高(D2 H)间建立的回归方程为:W干材=0.037 4(D2 H)0.928 1,R2=0.931 6;W树枝=0.010 4(D2 H)0.942 3,R2=0.738 7;W树叶=0.025 1(D2 H)0.750 1,R2=0.673 8;W树皮=0.026 2(D2 H)0.565 0,R2=0.675 5;W乔木层=0.087 7(D2 H)0.878 4,R2=0.929 5。表明随着群落演替的不断进行,甜槠栲仍然为最大的优势树种。群落平均生物量水平不高,但具有较大的上升空间,生物量增长的潜力较大。

In order to understand the community biomass level and structure of Castanopsis eyrei （Champ.）Tutch.in Leigong mountain,and establish the regression equation between a variety of biomass and tree measuring factors,provide a basis for estimating forest carbon sink of normal landforms of Guizhou province,this study adopted field investigations to conduct community surveys,determined the community biomass on the basis,and established estimated regression equation at the same time with the measured data.The results showed that Castanopsis eyrei （Champ.）Tutch .community in Leigong mountain consisted of a total of 6 9 species,having higher species diversity.Castanopsis eyrei （Champ.）Tutch .was the constructive species in the community.Biomass allocation status in the vertical structure was tree layer（83.38%）〉shrub layer（15.25%）〉herbaceous layer（1.37%）,and the average biomass of tree layer,shrub layer,herbaceous layer were 46.31,8.47, 0.76 t/ha in unit area.The order of each component biomass of tree layer was dry wood（62.10%）〉branches（2 1.3 6%）〉leaves（1 1.7 9%）〉bark（4.7 5%）.The regression equation between biomass of each component,total biomass in tree layer and measurement factors（diameter at breast height,height）was asnbsp;follows：Wdrywood=0.037 4（D2H）0.928 1,R^2=0.931 6;Wbranches=0.010 4（D2H）0.942 3,R^2=0.738 7;Wleaves=0.025 1（D2H）0.7501,R^2=0.673 8;Wbark=0.026 2（D2H）0.5650,R^2=0.675 5;Wtreelayer=0.087 7 （D2H）0.878 4,R^2 =0.929 5.The above results indicated Castanopsis eyrei （Champ.） Tutch.was still the biggest advantage species with the ongoing community succession,the average biomass level of community was not high,but had a larger increase in space,the potential of biomass growth was larger.