阿拉善荒漠区植物多样性与土壤理化性质相关性研究

Correlation between Plant Diversity and Soil Properties in Alax Desert

为了弄清阿拉善荒漠区的植物多样性特征,初步阐明调控荒漠植被空间分布的土壤理化指标,本文对阿拉善荒漠流动沙地、固定沙地、砾质沙地和盐碱地四种生境下植物多样性与土壤理化性质的关系进行了研究,并确定了不同生境下植物多样性与土壤理化指标的逐步回归方程。研究结果表明:固定沙地和砾质沙地的植物多样性明显高于流动沙地和盐碱地;在砂粒含量较高的流动沙地和砾质沙地,灌木物种的Shannon-Wiener指数明显大于草本物种;逐步回归方程表明,土壤pH及砂粒含量显著影响流动沙地的植物多样性,固定沙地和砾质沙地的植物多样性与土壤中全磷、全钾含量密切相关,而土壤中全磷和总盐量则显著影响盐碱地的植物多样性。

In order to understand the characteristics of plant diversity in Alax Desert region, explore soil property index of regulating vegetation spatial distribution, the correlations between plant diversity and soil properties of moving sand, stabilized sand, gravel sand, and salina are discussed. The results show that plant diversity in stabilized sand and gravel sand are significantly higher than those in moving sand and salina. In moving sand and gravel sand, Shannon - Weiner diversity index of shrub is higher than herb, due to the higher sand content. Stepwise regression equations indicate that plant diversity is remarkably influenced by soil pH and sand content in moving sand. In stabilized sand and gravel sand, plant diversity is closely related to total phosphorus and total potassium. Furthermore, plant diversity is significantly affected by total phosphorus and total salt content in Alax Ddesert.