岷江上游干旱河谷区植被多样性与环境因子的相关性研究  

A Study of the Relatedness between Species Diversity and Environment Factors of the Arid Valleys in the Upper Minjiang River

作　　者：郑绍伟[1] 陈泓 黎燕琼[1] 李德鹏[1] 杨素香[3] 刘大虎[3] 龚良春[3] 

机构地区：[1]四川省林业科学研究院,四川成都610081 [2]重庆市渝北区林业局,重庆401100 [3]阿坝州理县林业局,四川理县623100

出　　处：《四川林业科技》2009年第6期21-27,共7页Journal of Sichuan Forestry Science and Technology

基　　金：国家"十一五"科技攻关项目(2006BAD03A03)

摘　　要：对岷江上游干旱河谷区植被多样性与环境因子相关研究表明:1)阴、阳坡灌、草丛植物群落物种α多样性指标均随海拔升高表现出明显的增加趋势,阳坡呈现出中间低两头高的海拔梯度格局;阴坡总体呈现直线上升的趋势。2)该区土壤肥力总体水平高低表现为:中上部>中部>下部>中下部、阴坡>阳坡。低海拔地区土壤破碎,土壤含水量和土壤肥力极低,高海拔地区的土壤水分含量和土壤肥力都相对较高,立地条件也较适宜植物的生长。3)植被多样性与环境因子的相关分析表明,海拔、坡向、坡度、土壤含水量、速效N、速效K、有机质、全N、全K与灌丛群落多样性和生物量均呈正相关关系,而pH值、速效P、全P、全Ca与多样性和生物量呈负相关关系。通过逐步回归分析和主成分分析筛选出环境主导因子为全N、速效P、土壤含水量和速效N。This research work focused on the relationship of species diversity and environment factors of the arid valleys in the upper Minjiang River. The results showed that the α diversity of shrub and herb increased with the rising of elevation both on north facing slope（nfs） and south facing slope（sfs）. The capacity of soil fertility showed the upper part 〉 central part 〉 lower part, and nfs 〉 sfs. Because of the broken soil there was a poor soil fertility and a low soil moisture at lower elevations. However, soil fertility and soil moisture were better at high elevations which fitted the growth of plants. The result of correlation anal- ysis between species diversity and environment factors indicated that there were positive correlations among environment factors （ elevation, exposure, slope, soil moisture, available N, available K, organic matter, total N, total K） and species diversity. And there were negative correlations among environment factors （ph Value,available P,total P and total Ca） and species diversity or biomass. The results of step-regress analysis and principal component analysis indicated that environment factors were synthetically affected by total N, available P, soli moisture and available N.

关 键 词：干旱河谷 多样性 环境因子 土壤肥力 相关性. 

分 类 号：S718.5[农业科学—林学]