阿克苏河流域山前荒漠带植物群落分布格局及物种多样性研究

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关键词：阿克苏河流域；山水工程；物种多样性;分布格局;数量分类；排序分析；结构方程模型中图分类号：Q948 文献标识码：A 文章编号：1007-0435（2026）04-1376-15

Abstract：To explore the distribution pattern and influencing factors of plant communities in the desert zone of the Aksu River basin’s landscape engeneering area，this study used field survey results as the research object. The TWINSPAN method was used for quantitative clasification of communities，and the CCA（canonical correspondence analysis）method was emplyed to screen significant influencing factors.The structural equation modeling was used to investigate the interactive relationship betweenthe distribution paterns of plant communities and environmental variables.The results showed that the TWINSPAN hierarchical classification classified the 3O survey locations into 6 association types. The Simpson and Shannon-Wiener diversity indices showed that association I and III had the highest values，while association Iand ΔV had the lowest. The Mrgalef richness index showed that association I had the highest value，which was significantly higher than association Vby 1.02 times （ （P<0.05） . The Pielou index showed that association IV had the highest value，with relatively uniform distribution. The similarity of each community type was highest between asociation I and II，with the highest Jaccard’s index and Sorenson’s index values of0.478 and O.393.CCA ranking results indicated that the primary environmental factors influencing community distribution patterns were multi-year average precipitation，elevation，soil organic matter，and soil bulk density P<0.001 .Further analysis of the interaction betwee environmental factors and association distribution paterns revealed that topographic factors，consisting of elevation and slope，had the greatest influence，with atotal effect size of O.852.These factors significantly influenced meteorological and soil factors such as annual average precipitation，evaporation，and soil organic mater，thereby influencing asociation spatial distribution paterns.This research provides a scientific theoreti cal foundation and empirical support for setting ecological restoration targets，vegetation selection，and measurement formulation for the Aksu River Basin landscape engineering project.

Key Words：Aksu Riverbasin;Mountain-water Project;Speciesdiversity;Distribution pattern;Numerical classi fication;Ordination analysis;Structural equation modeling

植被作为陆地生态系统的主要组成部分，是反映区域和全球生态系统稳定性的重要指标[1]。（剩余25004字）