广东康禾自然保护区亚热带常绿阔叶林立木结构及碳密度分布特征  

Stand structure and biomass carbon density in a subtropical evergreen broadleaved forest of heterogeneous diversity

作　　者：李文斌[1] 胡砚秋[1] 徐明锋[1] 苏志尧[1] 陈卫 吕远辉 

机构地区：[1]华南农业大学林学院,广州510642 [2]广东省东源县林业局,河源517000

出　　处：《福建农林大学学报（自然科学版）》2015年第3期256-263,共8页Journal of Fujian Agriculture and Forestry University:Natural Science Edition

基　　金：广东省林业科技创新专项(2011KJCX031-02);2012年度国家级大学生科技创新项目资助

摘　　要：在广东东源县康禾自然保护区林分起源相同的典型亚热带常绿阔叶林区域,在物种多样性有明显差异的3个群落分别设置1 hm2的样地,研究异质多样性下亚热带常绿阔叶林的立木结构及碳密度分布特征.研究结果表明,随着植物群落丰富度或个体数的增大,二次平均胸径和平均胸径指标都逐渐减小,而样方立木的总胸径和胸高断面积则逐步增加.生态优势度较低但多样性指数较高的群落1和群落2内,植物种类或个体数的增加使群落蓄积量得以增加,群落3则不然.生态优势度高、物种多样性相对较低的群落,林分蓄积和碳密度更高.这项研究结果提示,立木结构指标与林分碳储量没有直接相关关系,而立木多样性高的群落碳储量不一定高;大径级和具有生态优势的种类对亚热带常绿阔叶林蓄积量和碳储量的保持与增加具有主要贡献作用.In the typical subtropical evergreen broadleaved forest area that originated from the same time in the Kanghe Provincial Nature Reserve of Dongyuan,Guangdong Province,three forest communities with heterogeneous diversity were identified by a route survey and an 1 hm2 sample plot was set in each plant community separately to investigate the standing tree structure and carbon density distribution across the diversity gradient. The correlations of community species richness and the number of individuals with stand structure attributes in the sample plots exhibited various patterns. Species richness,the number of individuals increased as quadratic mean diameter and average DBH decreased,while the total DBH and basal area gradually increased. In Community 1 and Community 2,whose ecological dominance was lower and diversity index was higher as compared with Community 3,plant richness or number of individuals increased,which led to a higher stand volume,while such correlations in Community 3 were not the case.By comparing the standing tree structure and carbon density of these communities,it was proved that community with lower diversity index had higher stand volume,biomass and carbon density in contrast with the community with fewer dominant trees and higher diversity index. Trees with large DBH and ecologically dominant species mainly contributed to maintaining and increasing the stand volume and carbon storage in subtropical evergreen broadleaved forest. Our findings suggested that there was an indirect relationship between standing tree structure index and stand carbon sequestration and high standing tree diversity did not lead to high community carbon sequestration. The critical role of trees with large DBH and ecologically dominant species in the construction and conservation of forests targeted at carbon sequestration had to be emphasized.

关 键 词：立木结构 碳密度 多样性 蓄积量 

分 类 号：S718.54[农业科学—林学]