中文摘要：

利用经典统计学与地统计学相结合的方法对甘肃敦煌绿洲天然胡杨林下土壤水盐的空间变化特征进行研究。结果表明：敦煌绿洲天然胡杨林土壤含水量变化趋势总体表现为随深度增加而增加的趋势;0~60 cm土壤含水量变化程度较大,再向下各层土壤含水量变化趋于平缓。土壤全盐含量变化具有表浅层较高,平均含盐量达9.24%;从40~60 cm以下各层土壤全盐含量的变化均随深度增加而逐渐减少。土壤水盐含量的变异性在不同土壤层有较明显的差异,土壤含水量的变异性均属于中强度变异,土层越深,其含水量变化程度越小;而土壤全盐含量的变异均属于中度变异性,其变异程度由表层向下各不相同。采用ArcGIS的反距离加权（Inverse Distance Weighted）插值法分析表明,研究区土壤水盐含量存在明显的空间差异和较强的相似性,即各层土壤水盐均表现为西南低、东北高的空间分布规律。

英文摘要：

The spatial variability of soil water and salt content is remarkable.The traditional statistics and semi-variance analysis of geostatistics were used to study the spatial variability of the soil water and salt content under the natural populus euphratica forests in the west lake nature reserve of Dunhuang oasis.The results showed that there was about 15-20 cm dry sand layers in most parts of land,which made the surface soil water content at the lowest level of 0.8%-4.49%.The soil water content increased with soil depth.The soil water content changed more greatly in 0-60 cm layer than the deeper layers.The soil saline content was higher in the surface and averaged 9.24%.and reduced with soil depth from 40cm to 120cm.The variation of the soil water and salt contents changed evidently with soil depth.Water content changed in a medium-intensity way,and its variation range was getting smaller in deeper soil layers.While soil total saline content variance was medium and its intensity was different between surface and deep layers.Using the ArcGIS（Inverse Distance Weighted,IDW） interpolation method analysis,the soil water and saline content of studied area possessed obvious spatial differences and strong comparability.Both water and saline content in each layer exhibited the same spatial pattern of being lower in southwest and higher in northeast.