蚬木生存群落木本植物与土壤和地形因子的耦合关系  

Coupling relationships between woody plants in Excentrodendron hsienmu community and related edaphic and topographic factors.

作　　者：欧芷阳[1,2,3] 朱积余[1,2,3] 曹艳云[1,2,3] 何琴飞[1,2,3] 黄小荣[1,2,3] 彭玉华[1,2,3] 庞世龙[1,2,3] 

机构地区：[1]广西壮族自治区林业科学研究院,南宁530002 [2]国家林业局中南速生材繁育实验室,南宁530002 [3]广西优良用材林资源培育重点实验室,南宁530002

出　　处：《生态学杂志》2013年第12期3182-3189,共8页Chinese Journal of Ecology

基　　金：广西自然科学基金项目(2012GXNSFAA053042);广西优良用材林资源培育重点实验室自主课题项目(12B0401);广西林业科学研究院基本科研业务费项目(林科201201号)资助

摘　　要：为探讨环境因子对蚬木(Excentrodendron hsienmu)生存群落木本植物的影响,在TWINSPAN数量分类的基础上分析了蚬木生存群落物种组成、结构特征及群落的土壤肥力状况,并运用主成分分析和典型相关分析,对三者间的定量耦合关系进行了分析。结果表明:1)TWINSPAN将调查样方划分为6组,在3级水平分为4类生态群落类型。其中,物种多样性最大值出现在蚬木林,发育得较好的群落其土壤养分更为丰富。2)主成分分析显示,土壤交换性钙、全钾和速效钾在环境因子与群落结构的协同变化中居于主导地位。3)典型相关分析表明,群落Shannon多样性指数与土壤有机质、全钾、速效钾和全氮密切相关;海拔对群落物种多样性产生影响;土壤全氮、全磷与地形因子中的坡位和海拔间存在着密切的耦合关系。Excentrodendron hsienmu is listed in the Chinese National Key Protected Wild Plants （Class II） as a rare species due to the anthropogenic disturbances and the lack of effective pro- tection measures. To understand the relationships between E. hsienmu community and its envi- ronmental factors is helpful for the ecological restoration of this community. In this paper, the species composition and structural characteristics of E. hsienmu community and the related edaphic and topographical factors in the karst mountainous region in southwestern Guangxi, China were studied by two-way indicator species analysis （TWINSPAN）, and their coupling relation- ships were analyzed by principal component analysis and canonical correlation analysis. A total of 135 woody plant species in the E. hsienmn community were recorded, belonging to 103 genera and 52 families. The E. hsienmu community was divided into six groups, and classified into four ecological types at the third level by TWINSPAN. In the E. hsienmu-Pistacia weinmanniifolia community, the species number was the largest, with the maximum Shannon diversity index in E. hsienmu secondary forest. The higher soil fertility level was found under the better developed plant communities. The PCA showed that the soil exchangeable calcium, total potassium, and available potassium contents were the most important environmental factors in the coordinated var- iations of environmental factors and plant community structure. The CCA showed that the Shannon index of the plant community was closely correlated with soil organic matter, total potassium, available potassium, and total nitrogen. Elevation had important effects on the species diversity. Soil total nitrogen and phosphorus had close coupling relationships with slope position and eleva- tlon.

关 键 词：蚬木 植物群落 环境因子 主成分分析 典型相关分析 

分 类 号：Q948[生物学—植物学]