岷江干旱河谷植物群落生态梯度分析  

Ecological gradient of plant community in the dry valley of Minjiang River

作　　者：冶民生[1] 关文彬[1] 白占雄[1] 马克明[2] 刘国华[2] 汪西林[1] 

机构地区：[1]北京林业大学水土保持学院 [2]中国科学院生态环境研究中心系统生态重点实验室,北京100085

出　　处：《中国水土保持科学》2005年第2期70-75,共6页Science of Soil and Water Conservation

基　　金：国家重点基础研究发展规划项目"长江流域生物多样性变化;可持续利用与区域生态安全"(G2000048607)

摘　　要：为干旱河谷地区的植被恢复和生物多样性的保育提供科学依据,运用数量排序方法DCCA,就岷江干旱河谷调查的植被和环境数据进行排序分析,研究该地区植物群落分布与环境梯度之间的关系,并用主成分分析法,研究该地区灌丛地上生物量与环境因子之间的关系。DCCA排序结果表明,该地区植被的分布是土壤水分、土壤养分和微地形三者综合作用的结果;主成分分析结果表明,影响灌丛群落地上生物量的第1主成分中,土壤pH值、速效P、全N、有机质含量和坡向的影响较大,影响灌丛群落地上生物量的第2主成分因子,主要是土壤含水量和海拔,第3主成分因子,主要是土壤速效K,第4主成分因子,主要是地形中的坡度因子。灌丛地上生物量,也受土壤养分、水分、地形三者共同的影响和作用。To provide scientific accordance for vegetation rehabilitation and biological diversity protection, quantitative analysis method-DCCA ordination was used to analyze the vegetation and environmental data to reveal the relationship of ecological gradient and the distribution of plant community in the dry valley of the Minjiang River. Then the relationship of ground biomass of different shrubs and environmental factors were studied using principal component analysis. The result of DCCA ordination showed that the distribution of vegetation in the region is affected synthetically by soil moisture, soil nutrient and micro-topography. Principal component analysis showed that soil pH value, readily available P, Total N, soil organic matter and aspect of slope as the first principal component had effects on ground biomass of shrubs. The second principal component mainly included soil moisture and altitude. The third and forth principal component mainly consisted of soil readily available K and slope gradient respectively. Ground biomass of main shrub is also affected synthetically by soil nutrient, soil moisture and topography.

关 键 词：梯度分析 群落生态 植物 岷江 地上生物量 干旱河谷地区 主成分分析法 DCCA排序 土壤养分 灌丛群落 生物多样性 土壤pH值 有机质含量 土壤含水量 科学依据 植被恢复 排序方法 排序分析 环境数据 环境梯度 群落分布 环境因子 

分 类 号：S718.54[农业科学—林学] S941.52