伊犁河谷北坡野果林木本植物种间关系及环境解释  

Interspecific and environmental relationships of woody plant species in wild fruit-tree forests on the north slope of Ili Valley

作　　者：田中平[1] 庄丽[1] 李建贵[2] 程模香[1] 

机构地区：[1]石河子大学生命科学学院,新疆石河子832000 [2]新疆农业大学林学院,乌鲁木齐830052

出　　处：《生物多样性》2011年第3期335-342,396-397,共8页Biodiversity Science

基　　金：国家科技支撑计划项目(2007BAC15B06;2006BAD26B0901;2007BAC17B06);石河子大学项目(Q9yy200814;500002061602)

摘　　要：伊犁河谷北坡野果林是天山山脉中一个重要的植被类型,对其种间关系进行研究将有助于揭示野果林群落的动态特征。我们于2009年在野果林的不同群落中设置了10个样地,记录了群落的物种组成以及环境因子,包括海拔、坡度和坡向,测定了土壤含水率和有机质等土壤参数。采用χ2检验、Pearson相关系数和Spearman秩相关系数检验等方法,对野果林乔木层和灌木层种间关联性进行了研究。结果表明:Pearson相关检验优于χ2检验,Spearman秩相关检验比Pearson相关检验更加灵敏;乔木和灌木优势种绝大多数种对的联结关系未达到显著水平,群落结构较为松散,表明各群落可能处于演替的早期阶段;在影响物种分布的环境因子中,海拔起决定性的作用,其次是坡向、土壤含水率、有机质、全氮和pH值。The wild fruit-tree forest on the north slope of the Ili Valley is a living testament to the vegetative history of the Tianshan region.It is a type of broad-leaved forest appearing in the desert region.However,little is known about interspecific relationships among the major woody species or their process of succession.In 2009,we sampled 10 typical communities and investigated the abundance,height and coverage of woody plants as well as the topographical and soil conditions within each quadrat （20 m×20 m quadrats for trees,10 m×10 m for shrubs）.Interspecific associations were analyzed using continuity corrected χ 2 test,Pearson correlation and Spearman rank correlation.DCCA （detrended canonical correspondence analysis） was used to identify topographical and soil factors that affected woody plant distributions.The network diagram based on Pearson＇s and Spearman＇s rank correlation coefficients displayed interspecific relationships clearly.There were negative associations among overall tree or shrub species,indicating a strong independent relationship between species.However,correlation coefficients of most species pairs were insignificant,a fact that may be related to the community＇s developmental stage （the early succession stage） and the species＇ ecological traits.Positive correlations among the abundance of dominant species were likely due to similar ecological tolerances.This assertion is also supported by our analyses of woody plant distributions and environmental factors.DCCA analysis showed that elevation was the most dominant factor affecting the plant distribution,followed by aspect,soil moisture,organic matter,total nitrogen.

关 键 词：优势种群 生态种组 种间联结 生态位重叠 演替 生态适应性 环境解释 

分 类 号：Q948[生物学—植物学]