科尔沁沙地植物物种丰富度格局及其与环境的关系

能量、水分和生境异质性是物种丰富度分布格局的重要因素。本文以特殊环境科尔沁沙地为对象,通过植物区域物种丰富度数据和对应气候数据统计,结合生境异质性分析,对科尔沁沙地物种丰富度格局及其主导因素进行研究。结果显示:(1)科尔沁沙地植物共计有115科1030种,呈现显著的空间异质分布,随着经度的增加物种丰富度呈先下降后上升的趋势,而受纬度影响较小。(2)水热动态假说最适合用于解释科尔沁沙地植物物种丰富度格局。说明水资源可利用性是科尔沁沙地植物物种丰富度的主要影响因素。

Biogeographical patterns and environmental interpretation of plant species richness in the Horqin Sandy Lands

Energy, water, and habitat heterogeneity are important factors for species richness distribution. Based on regional species richness data, corresponding climatic data, and habitat heterogeneity, the species richness pattern of the Horqin Sandy Lands and its dominant factors were studied. Results demonstrated there were 115 families and 1030 species of plants in the Horqin Sandy Lands, which showed significant spatial heterogeneity. With the increase in longitude, species richness decreased at first and then increased, whereas latitude had less effect. Furthermore, the water-energy dynamics hypothesis was most suitable for explaining the species richness patterns in the Horqin Sandy Lands. Our results therefore indicated that water resource availability was the main factor affecting species richness in the Horqin Sandy Lands.