锡林河流域栗钙土具有典型的草原土壤特征。土壤水分是生产力主要的制约因素，水分状况受到天然降水及土壤性状的影响，水分特征曲线研究表明，土壤持水力与质地及有机质含量有密切关系，水分有效性主要取决于土壤含水量及释水性。土壤水分动态有明显的阶段性变化规律。地形、母质、地表状况、质地及剖面特征决定了水分空间变异情况，长期低水平的水分循环是栗钙土生产力不高、不稳的主要原因 The chestnut soil in Xilin River Basin has typical characteristics of grassland soil. Soil moisture is the main limiting factor of productivity. The water status is affected by natural precipitation and soil properties. The study of water characteristic curve shows that the soil water holding capacity is closely related to the texture and organic matter content. The water availability mainly depends on the soil water content and water release . Soil water dynamics have obvious stages of change. Topography, parent material, surface condition, texture and profile characteristics determine the spatial variability of water. The long-term low-level water cycle is the main reason for the low productivity and instability of chestnut soil