焉耆霍拉山植物群落物种多样性与系统发育多样性沿海拔梯度分布格局研究

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中图分类号：Q948.13 文献标识码：A 文章编号：1007-0435（2025）05-1612-10

Abstract：In order to reveal the altitudinal distribution characteristics and maintenance mechanisms of species diversity and phylogenetic diversity of plantcommunities in arid desert areas.In this study，we analyzed the distributioncharacteristics of species diversity and phylogenetic diversity of plant communities along the altitudinal gradient and their driving factors，taking the desert shrub communities in the Hola Mountains as object.The results showed that the Margalef index，Simpson index，Shannon-Wiener index and phylogenetic diversity index showeda single-peak trend with the increase of altitude，and the community phylogenetic structure changed from divergence to aggregation.The phylogenetic diversity index was positively correlated with the Margalef index， Simpson index and Shannon-Wiener index. The net genealogical relatedness index was negatively correlated with the Margalef index，but positively correlated with the Simpson index and the Pielou index.The net closest interspecific relatedness index was negatively correlated with the Margalef index.The netclosest interspecific kinship index was significantly negatively corelated with Margalef index but positively correlated with Pielou index. Soil water content，total salt，total nitrogen，and quick-acting phosphorus content were important drivers of species diversityand phylogenetic diversity with the elevation gradient.Species diver sity and phylogenetic diversity of desert scrub communities in the Hola Mountains are closely related，and soil factor is an important factor influencing their changes along the altitudinal gradient.

KeyWords：Desert scrubland;Species diversity;Phylogenetic diversity;Phylogenetic structure;Soil environmen tal factors

物种多样性的海拔梯度格局及其形成机制是生物多样性保护研究的重要组成部分[1]。（剩余15438字）