Abstract: [Objective and Metnod]This paper comparatively analyzes the characteristics of the spatial variability of soil profile average water and salt content in the bare land and vegetational area using the typical salinizational area of oasis-desert ecotone in Qitai as the study area.[Result]The results showed that the soil water and salt content of bare land and vegetational area obey normal distribution; soil salinity belongs to moderate variability with a stronger spatial autocorrelation. Soil moisture variability in the bare land belongs to weak variability with moderate intensity of the spatial autocorrelation; vegetational area belongs to medium (weaker) variability with strong spatial autocorrelation. Bare land correlation distance is about 1/10 of vegetational area. With soil depth increasing, the activity changes of soil salinity in bare land and vegetational area are as follows: active layer, sub-active layer and stabler layer. Soil moisture change and its relationship with salt content are inconsistent, the surface of bare land affected largely by random factors is the most active and its correlation with salinity is also poorer,while the vegetation area in the middle and lower layer (60-80 cm) is the most active, which shows highly positive correlation with the salt. [Conclusion]Affected by random factors and structural factors (such as vegetation, micro-topography, etc.), the spatial variability of soil water-salt in the two vegetational coverages shows obvious difference and reflects significant active force and reactive force that the vegetation affects the water and salt distribution and the random factors of water and salt distribution.

摘要： [目的]裸地和植被覆盖地土壤剖面平均水盐含量的空间变异特征.[方法]应用统计学方法、聚类分析法和相关分析法,以奇台绿洲-荒漠交错带典型盐渍化地为研究区进行对比分析.[结果]裸地和植被地土壤水盐都服从正态分布,土壤盐分均属中等变异性,具有较强的空间自相关性.裸地土壤含水量属弱变异性,具有中等强度的空间自相关性;植被地属中等(偏弱)变异性,具有较强空间自相关性.裸地的相关距离仅是植被覆盖地的1/10左右.随着土层深度的增加,两者土壤盐分活跃程度变化依次为:活跃层、次活跃层和较稳定层.土壤水分的变化及其与盐分的关系则不一致,裸地是以受随机性因素影响较大的表层最为活跃,其与盐分的相关性也较差;而植被地是以中下层(60～80 cm)最为活跃,其与盐分呈极显著正相关性.[结论]由于随机性因素和结构性因素(如植被、微地形等)的影响,两种植被覆盖度下的土壤水盐的空间变异表现出明显的差异性;也反映出植被对土壤水盐分布及影响水盐分布的随机性因素均具有显著的作用力及反作用力.