额济纳胡杨空间分布格局及其与微生境异质性的关系研究

Relationships between Microhabitat Heterogeneity and Spatial Distribution Pattern of Populus euphratica in Ejina of Inner Mongolia

通过地统计学与方差分解等方法,对额济纳二道桥胡杨幼苗、幼树、成树以及微生境因子的分布格局进行研究。结果表明:受不同生活史阶段和微生境异质性的影响,胡杨幼苗趋于聚集分布,而幼树、成树则表现为随机分布;土壤全氮、含水率、全盐表现出显著的空间自相关结构,在空间上表现为聚集分布;胡杨幼苗的空间分布与土壤全盐含量呈负相关,而成树与土壤全氮、全盐显著正相关;环境因素与空间因素是影响胡杨种群分布格局的2个重要原因。

By means of geostatistics and variance decomposition,the distribution patterns of seedling,young tree,adult tree and microhabitat factors of Populus euphratica were studied.The results showed that the seedlings were in aggregating distribution,which were mainly influenced by different life stages and microhabitat factors,while young trees and adult trees were random distribution.Soil total nitrogen,soil moisture content and soil total salt showed significant spatial autocorrelation structure,which were also in aggregating distribution.The spatial distribution of seedlings had negative correlation with soil total salt content,while adult trees had significant correlation with soil total nitrogen and total salt.The environment and the spatial factors had an important effect to the distribution patterns of Populus euphratica.