基于结构方程模型的云南松次生林林木多样性影响因子  

Impact Factors of Forest Diversity in Yunnan Pine Secondary Forest Based on Structural Equation Model

作　　者：舒树淼 赵洋毅[1] 段旭[1] 胡慧蓉[1] 熊好琴[1] 

机构地区：[1]西南林业大学,昆明650224

出　　处：《东北林业大学学报》2015年第10期63-67,共5页Journal of Northeast Forestry University

基　　金：云南省应用基础研究项目(2012FD028);国家林业局林业科技创新平台项目(2015-LYPT-DW-138);云南省教育厅研究项目(2013Y114);云南省高校优势特色重点学科(生态学)建设项目(05000511311)

摘　　要：采用结构方程模型分析了滇中地区云南松次生林的林木大小多样性与立地条件、林分结构的作用关系。结果表明:立地条件和林分结构对多样性的影响系数分别为0.85和0.71。其中,立地条件对林木大小多样性的影响除直接作用外还存在间接作用。对胸径多样性的直接和间接影响系数均为0.23;对树高多样性的直接或间接影响系数分别为0.77和-0.38。另外,林分空间结构和林分非空间结构对胸径、树高的多样性影响各有偏重。空间结构更多的影响树高多样性,影响系数为0.81,而非空间结构更多的影响胸径多样性,影响系数为-0.44。空间结构对多样性为正影响,非间结构对多样性为负影响,但对多样性的影响总体上是空间结构的作用大于非空间结构的作用。We used the structural equation model to study the relationship between the diversity of forest size of Yunnan pine secondary forest and the impacting factors including site condition and the forest structure in Yunnan Province. The influence of diversity path coefficients of site condition and stand structure were 0. 85 and 0. 71,respectively. The effect of site condition on the diversity of forest size still had the indirect effect besides direct effect. Site condition on the DBH（ diameter at breast height） diversity of direct and indirect influence path coefficient was 0. 23,and on tree height diversity of direct and indirect influence path coefficient were 0. 77 and 0. 38,respectively. The stand spatial structure and stand non-spatial structure of forest had different effects on the diversity of the DBH and tree height. The spatial structure affected the tree height diversity largely with the influence path coefficient of 0. 81,but the non-spatial structure influenced the DBH diversity largely with the effect path coefficient of- 0. 44. The spatial structure had positive effect on the diversity,and the non-spatial structure had a negative effect on the diversity. On the whole,the influence of the spatial structure on the diversity is greater than that of the non-spatial structure.

关 键 词：林木大小多样性 立地条件 林分结构 结构方程模型 云南松次生林 

分 类 号：S758.5[农业科学—森林经理学]