不同类型高寒草地群落物种特征和均匀度的重要性

通过对不同类型草地生产力与物种特征(重要值)、均匀度之间的关系研究,结果表明:群落物种特征(重要值)与生产力之间呈极显著的线性关系;物种均匀度与生产力之间呈负线性关系,但差异不显著.在自然生态系统中,由于物种间的相互作用(资源的竞争利用),物种数目在不同类型草地群落的物种组成上的不均匀分布,导致不同生境条件下均匀度的异同.

Importance of Species Characteristics and Evenness in Different Type Grassland

Productivity is an important modality of ecosystem functioning.The species diversity of natural communities is often strongly related to their productivity.In the present paper,the relationship between productivity and species characteristics(important value),as well as the species evenness of different types of alpine meadows,was analyzed.The results indicate that there existed a notable linear response species characteristics of communities and productivity,and a negative linear relationship between the species evenness and productivity of communities,though the difference was not significant in statistic.Discrepancy in species evenness under different ecological conditions results from interspecific competition for resources,and from the species unequal distribution in species composition of different grassland type communities.