天山南坡山前荒漠草地植物群落分布对环境因子的响应——以拜城县为例

Subjects: Biology >> Ecology submitted time 2023-08-26 Cooperative journals: 《干旱区研究》

鲁元波1,2,3 严成1,3 宋春武1,3,4 李雅娟5 来赪雲5

Abstract：  To investigate the response of plant community distribution to topography and soil factors in the premountaindesert grassland of Baicheng County on the southern piedmont of Tianshan Mountain, we selected atypical area for investigation. We used the dominance method and canonical correspondence analysis (CCA) tostudy the relationship between plant community distribution and topography and soil factors in the mountaindesert grassland. We observed differences in the species diversity of shrub and herb layers between survey samplesites. Specifically, the Shannon-Wiener index, Pielou index, and Simpson index on the eastern slope showed moreshrubs than herbs; while on the western and northern slopes, these indexes showed more herbs than shrubs. Theresults of CCA show that topographic factors influenced plant community diversity in the order of slopeorientation > slope gradient > slope position; and soil factors influenced plant community diversity in the order ofsoil moisture in the 30-100 cm soil layer > total soil porosity (STP) > soil moisture in the 0-30 cm soil layer(SMC-1). Topography and soil factors had certain screening effects on the formation of plant communities. Soilmoisture in the 30-100 cm soil layer and slope orientation were the key factors affecting the distribution of plantcommunities in the pre- mountain desert grassland of Baicheng County on the southern piedmont of TianshanMountain.

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