糙隐子草草原狼毒种群与其他主要植物的种间联结分析

Analysis to the interspecific association of Stellera chamaejasme population and other main plant species in Cleistogenes squarrosa steppe

应用方差检验法和基于 2× 2列联表的分析手段对糙隐子草草原的 3个放牧演替阶段主要植物种间的总体联结性和狼毒种群与其他主要植物的种间联结进行了定量分析。结果表明 ,随着逆行演替进程 ,群落主要植物总体的种间联结由显著的正关联过渡到无关联 ;狼毒与群落内大多数植物的关联不显著 ,种间系趋向于相互独立 ;在重牧和过牧阶段 ,狼毒与糙隐子草、达乌里胡枝子、冷蒿和冠芒草正关联不显著 ,但具有较高的关联度 ;狼毒与冠芒草在重牧、过牧、极牧 3个演替阶段均呈一定的正关联。

Using variance test and 2×2 contingency table method, quantitative analysis to the overall interspecific association among the main plant species, and between Stellera chamaejasme and any other main plant species for the three grazing successional stages (heavy, over and extreme) on Cleistogenes squarrosa steppe was made in the paper. The results indicated that:(1)with the processing of the retrogressive succession, the overall interspecific association among main plant species of the communities transformed from significant positive to null; (2)interspecific association between Stellera chamaejasme and most of other plant species in the communities was insignificant, and interspecific relationships tended to be inter-independent; (3) of the heavey and over grazing stages, insignificant positive association but high association degrees were detected between Stellera chamaejasme and any other of the following: Cleistogenes squarrosa, Lespedeza daurica, Artemisia frigida, Enneapogon brachystachyum;(4) Stellera chamaejasme and Enneapogon brachystachyum displayed somewhat positive association in the three successional stages.