摘要
以重庆忠县石宝寨三峡库区消落带为典型案例区,探讨了库区消落带生物多样性指数沿坡面的梯级分布格局,并通过典范对应分析探讨消落带植被生态学特征与环境要素的关联,界定三峡大坝低水位阶段影响消落带植被生态学特征与恢复能力的关键环境因子。相关研究结果表明:库区消落带植被的生物多样性指数随坡面高程变化呈现一定的空间异质性;消落带植被的分布与土壤物性、河边距以及海拔等环境要素具有一定的关联。
Influenced by Three Gorges Reservoir operation mode of ＂storing the clear water and releasing the muddy water＂,the falling zone has developed in the Three Gorges Reservoir area,which covers 348.93 km2 areas.And owing to the typical characteristics of alternation of submergence and emergence and wide change extent of water level,the falling zone has complicated ecological characteristics.At meanwhile,this characteristics,to identify the ecological characteristic of vegetation in wet-dry zone,this characteristics plays an important role to ecological restoration project in the falling zone.On the basis of this,this paper selected the falling zone in Zhongxian Shibaozhai of ZHONG county as a study case to analyze the vegetation ecological characteristics.Firstly,ecological diversity index（EDI） was used to analyze the spatial distribution pattern of vegetation ecological diversity.Secondly,canonical correspondence analysis（CCA） was adopted to find the correlation between environmental factors and typical ecological characteristic.Then,by CCA analysis,key environmental factors,which influence the vegetation ecological characteristics,were found in this study.The result shows： with the change of slope height,the EDI of vegetation in the falling zone presents spatial heterogeneity;there have two turning points in the position of 150 m and 160 m;there exist remarkable positive correlations among vegetation distribution and soil water content,soil thickness,and negative correlations among vegetation distribution and altitude,river distance.
出处
《长江科学院院报》
CSCD
北大核心
2010年第11期81-85,共5页
Journal of Changjiang River Scientific Research Institute
基金
国家科技支撑计划课题(2008BAD98B02)
长江科学院博士启动基金项目(CKSQ2010079)
中央级公益性科研院所基本科研业务费项目(YWF0904)
关键词
三峡大坝
消落带
生态特征
生物多样性指数
典范对应分析
Three Gorges Project
falling zone
ecological characteristic
ecological diversity index
canonical correspondence analysis
