高寒草甸植物群落中物种多样性与群落变异性的关系及其机制初探

通过对高寒草甸植物群落中采集的群落数据进行分析，探讨了物种构成的相似性、统计平均、种群变异性和净协方差等机制对形成高寒草甸植物群落中多样性与群落地上生物量变异性之间关系的影响。结果表明，地上生物量的年际变异性随着多样性的增加而减小。物种构成相似性是多样性一变异性负关系产生的原因之一，而相似性与多样性之间并无显著相关关系；统计平均效应是另一个多样性一变异性负关系的主要决定者；净协方差效应、种群变异性对多样性一变异性关系产生的影响不显著或非常有限。

Relationships between species diversity and community variability in alpine meadow plant communities and their underlying mechanisms

By analyzing the plant community data from a natural alpine meadow, effects of the similarity in species composition, statistical averaging, net covariance, and population variability on the relationships of species diversity with the variability of aboveground biomass in alpine meadow plant community were investigated. The results showed that the variability of aboveground biomass per plot decreased with increasing species richness and composition similarity, while there was no significant correlation between species diversity and composition similarity. It was statistical averaging but not net covariance the dominant factor determining the negative correlation between species diversity and variability in aboveground biomass. Population variability also devoted, but only a few, to the negative correlation.