摘要: 为探明天山南坡拜城县山前荒漠草地植物群落分布对地形与土壤因子的响应，本研究选取了拜城山前荒漠草地典型区域进行调查，采用优势度法和典范对应分析（Canonical correspondence analysis，CCA）法，研究山地荒漠草地植物群落分布与地形和土壤因子之间的关系。结果表明：（1）不同调查样点灌木层和草本层物种多样性存在差异，东坡调查样点Shannon-Wiener指数、Pielou指数和Simpson指数均表现为灌木大于草本，西坡和北坡调查样点Shannon-Wiener指数、Pielou指数和Simpson指数均表现为草本大于灌木；（2）典范对应分析法分析结果表明，地形因子对植物群落的影响大小顺序为：坡向（SA）>坡度（SG）>坡位（SP），土壤因子对植物群落的影响大小为：30~100 cm土层土壤水分（SMC-2）>土壤总孔隙度（STP）>0~30 cm土层土壤水分（SMC-1）。地形和土壤因子对不同植物群落的形成具有一定的筛选作用，30~100 cm土层土壤水分和坡向是影响天山南坡拜城县山前荒漠草地植物群落分布的关键因子。
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.
| [V1] | 2023-08-26 13:24:04 | ChinaXiv:202308.00667V1 | 下载全文 |
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