延河流域植物群落高度变化与群落构建  

Height Variations and Assembly of Plant Communities in Yanhe Basin

作　　者：王婧[1] 温仲明[1,2,3] 张春梅[1] 赵臻[1] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]西北农林科技大学水土保持研究所,陕西杨凌712100 [3]中国科学院水利部水土保持研究所,陕西杨凌712100

出　　处：《水土保持通报》2011年第2期181-185,共5页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金项目"黄土丘陵区潜在植被格局及其对未来气候变化的响应"(40871246);国家科技支撑课题"植被优化配置与可持续建设技术"(2006BAD09B03)

摘　　要：性状—梯度分析能够解释群落构建机理和生态系统结构与功能,是生态学研究的热点。以延河流域24个地带性物种为研究对象,并计测各物种在各群落的高度。将高度值分解为α组分和β组分,以表征植物高度在群落内部及群落间的变化。结果表明,对整个流域而言,植物群落内部种间作用引起的物种高度变化大于环境因素作用下的群落间物种高度变化,草本群落变化情况与整个流域相一致,α值大于β值,物种高度变化主要取决于种间相互作用,而对灌木和乔木群落,β值大于α值,环境梯度变化对群落形成的作用要大于群落内种间作用;而植物高度在种内变化分析表明,种内差异引起的高度变化小于群落水平高度变化。研究结果对于正确认识环境因素及生物相互作用在不同植物群落形成过程中的作用具有重要意义,对揭示延河流域的植被格局变化和指导植被恢复可提供很好的理论支持。The trait gradient analysis as a hot topic in ecological research provides an improved approach to explain community assembly and ecosystem structure and functions.Twenty-four dominant species in Yanhe Basin were investigated by recording their heights in their communities.The heights were then decomposed into α and β components to characterize the variations of plant heights within and among communities.The results show that the height variations of the dominant species were owing more to the interactions between species within the community than to the influences of the environment.The herbage communities had higher α than β values,similar to the whole basin,implying a dominant influence from the interaction among species.While in shrub and tree community,the β value was generally higher than α value,suggesting stronger impacts from the environment gradient changes.The findings of this study are of great significance to understand the role of environmental factors and biological interactions in the formation of plant communities,providing bases for revealing changes of vegetation patterns and guides for vegetation restoration.

关 键 词：植被高度 性状梯度分析 群落构建 功能性状 α和β性状值 

分 类 号：Q948.1[生物学—植物学]