科尔沁沙地流动沙丘-丘间低地过渡带植被分布特征及种间关联

Spatial Distribution and Interspecific Association of Plants in Ecotone between Mobile Sand Dunes and Interdune Lowlands in the Horqin Sandy Land

运用Pearson相关检验、Spearman秩相关检验、CA群落多元统计分析等,系统研究科尔沁沙地流动沙丘与丘间低地过渡带物种的空间分布特征和种间关联性。结果表明:物种间表现出有选择性的种间积聚,但偏流动沙丘一侧沙蓬(Agriophyllum squarrosum)和乌丹蒿(Artemisia wudanica)的分布相对独立,说明沙蓬和乌丹蒿占有相对独立的生态位。丘间低地一侧黄柳(Salix gordejevii)和小红柳(Salix microstachya var.bordensis)主要分布于丘间低地北部,占有相似的生态位,而山竹岩黄蓍(Hedysarum fruticosum)主要分布于丘间低地南部,与前两个物种生态位相分离。Pearson相关性检验与Spearman秩相关检验的结果基本一致,负相关种对数高于正相关种对数,存在生态位分化,群落处于不稳定的演替阶段。

Spatial distribution and interspecific association of plant species are important for revealing how species interact with each other and response to environment change,and hence have important implications for optimal community management and regeneration of degenerated ecosystems.Community structure and interspecies association in the ecotone between mobile sand dunes and interdune lowland in the Horqin Sandy Land were studied using the Pearson correlation,Spearman rank correlation and multivariate analysis（Correspondence Analysis,CA）.The results indicated that the difference of species distribution was jointly affected by both environment and biotic factors.There was a selective interspecies accumulation.However,the niches of Agriophyllum squarrosum and Artemisia wudanica were separated from those of other species because they were distributed independently.Salix gordejevii and S.microstachya occupied a similar niche since both of them were distributed on the left side of interdune lowland,but the niche of Hedysarum fruticosum was separated from the niches of other two because it mainly distributed on the other side of interdune lowland.The results of Pearson correlation test were basically consistent with those of Spearman rank correlation test.The community was in unstable succession because the negative correlation coefficients were higher than the positive ones,and there was a niche differentiation.