翅果油树群落结构多样性

Structural diversity of Elaeagnus mollis communities

群落结构多样性的研究可以为实施更加有效的生物多样性监测、保护与持续利用提供科学依据。采用扩展形式的Shannon指数和基于方差的结构多样性指数(STVI)对山西省翅果油树群落进行了结构多样性研究。结果表明:两个结构多样性指数表现出较为一致的变化趋势,均可反映山西翅果油树群落的结构多样性差异;群落类型、物种组成、空间结构,以及生境条件、环境因子和人为干扰强度等是影响翅果油树群落结构多样性的主要因素;STVI结构多样性指数克服了在计算多样性时将直径和高度划分等级时的主观性,并且能更好地描述一个较大的结构序列,因此运用价值更大。

It is generally accepted that the research of structural diversity of communities can provide scientific basis for monitoring, conservation, and sustainable utilization of biodiversity in more efficient way. In this paper, both extended Shannon index and the structure index based on variance （STVI） were adopted to study the structural diversity of Elaeagnus mollis communities in Shanxi Province, China. The two indices showed a relatively consistent development trend, and thus, could comprehensively reflect the differences in the structural diversity of the communities. Community type, species composition, spatial structure, habitat condition, environmental feature, and human disturbance intensity were the main factors affecting the structural diversity. As compared to extended Shannon index, STVI index minimized the subjectivity in categorizing with diameter and height, and could better describe a wider array of structure, being more available in quantitatively analyzing the structural diversity of communities.