Influence of edaphic factors on plant distribution and diversity in the arid area of Xinjiang, Northwest China

土壤学 环境科学 干旱 土壤pH值 植物群落 横断面 土壤盐分 生态学 土壤有机质 植被(病理学) 农学 土壤水分 土壤科学 物种丰富度 生物 病理 医学
作者
Xueni Zhang,Xiaodong Yang,Yan Li,Xuemin He,Guanghui Lv,Jianjun Yang
出处
期刊:Arid Land Research and Management [Informa]
卷期号:32 (1): 38-56 被引量:33
标识
DOI:10.1080/15324982.2017.1376004
摘要

The influence of edaphic factors on plant distribution is essential to community ecology and important for vegetation restoration and management in arid ecosystems. In this study, desert plant distribution and diversity as well as soil water, salinity, and nutrients were measured in the Ebinur Lake Wetland Nature Reserve (ELWNR) in arid Northwest China. We determined relationships between plant distribution and soil factors along a transect with increasing distance from the river and created optimal models using soil factors to explain variations in plant diversity. In general, soil factors decreased with increasing distance from the river. Soil volumetric water content (SVWC), electrical conductivity (EC), pH, nitrogen (N), phosphorus (P), and sulfur (S) were closely related to plant distribution. According to canonical correspondence analysis, plants along the transect were divided into three groups: saline–alkaline tolerant, drought tolerant, and high P-demanding. SVWC, pH, soil organic carbon (C), N, P, and S account for 93.8% of the variations in plant diversity in the ELWNR. Compared with other soil factors, S explained the largest percentage of variations in diversity when single soil variables were considered in generalized additive models (R2 = 38.9%). Our results suggest increases in soil pH, P, N, and S would improve plant diversity significantly. We found differences among species groups in preference for habitat, and N and S content had a significant positive effect of on plant diversity, providing a scientific reference for plant restoration and saline soil remediation in desert ecosystems.
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