中文摘要：

在科研及实践工作中往往需要大量的、空间分辨率较高的凋萎系数、田间持水量和饱和含水量数据，大规模布点测定这些土壤水分常数难度较大，需要探索估算这几种常用土壤水分常数的新方法。以黑龙江省呼兰河流域为例，采用DEM数据提取流域边界，应用提取后的流域DEM从世界土壤数据库（HWSD）中提取流域土壤的砂粒、粘粒百分含量及USDA土壤质地分类数据，再应用这三种土壤属性数据估算流域各栅格的凋萎系数、田间持水量和饱和含水量。研究结果表明：应用HWSD可以估算出呼兰河流域0～30cm和30～100cm两种土层的凋萎系数、田间持水量和饱和含水量．空间分辨率可达到30″，为获取较高分辨率及深土层的区域土壤水分常数提供了一种新方法。

英文摘要：

The wilting point, field capacity and saturated water content are the basis for the scientific research and productive practice. It is necessary to explore the new method for estimating the staple soil water constants by reason that to achieve such soil water constants by way of point-distribution observation is unadvisable. In this study, the Hulanhe River Basin boundary was extracted by using DEM data. The data of percentage composition of sand and clay, and USDA Texture Classification was acquired from Harmonized World Soil Database based on the extracted DEM. The wilting point, field capacity, and saturated water content were estimated by using the acquired three soil properties data. The results indicate that the wilting point, field capacity, and sat- urated water content in the two soil layers of the depth of 0-30 cm and 30-100 cm in the Hulanhe River Basin could be esti- mated by using HWSD of the current version, and the spatial resolution of the data was up to 30＂. Therefore, a new method for achieving the regional soll water constants with high resolution and in the deep soil layer was provided.