塔克拉玛干沙漠土壤水分运动参数的计算  

CALCULATING SOIL HYDRAULIC PROPERTIES IN TAKLIMAKAN DESERT

作　　者：黄强[1] 刘玉芸 李生秀[1] 宋郁东[3] 

机构地区：[1]西北农林科技大学,杨陵72100 [2]新疆农业高等职业专科学院,昌吉831100 [3]中国科学院新疆生态与地理研究所,乌鲁木齐830011

出　　处：《干旱区地理》2002年第1期75-78,共4页Arid Land Geography

基　　金：中国西部干旱区生态环境演变与调控研究 (G19990 435 0 6 ) ;中国科学院"西部之光"项目 ( 2 0 0 12 0 34)

摘　　要：利用田间实测的一套土壤含水率对应基质势数据 ,根据VanGenuchten提出的水分特征曲线公式 ,用最小二乘法拟合了塔克拉玛干沙漠中部土壤的水分特征曲线方程。根据水分特征曲方程中的参数 ,采用Mualem提出的非饱和土壤导水率公式 ,推算了当地非饱和土壤导水率公式。并根据上述计算结果 ,推算了非饱和土壤扩散率和比水容量两个参数的计算公式。Summary A set of data about soil water contents corresponding to soil water potentials were collected in the center of Taklimakan Desert. A water retention equation based on a closed form equation quf forwarded by Van Genuchten was established by using this set of data, and as a results, there were small differences between calculated values and observed values. Meanwhile, an equation for soil water conductivity vs soil water potential was also established by employed the equation forwarded by Mualem. Finally, equations for soil water diffusion vssoil water potential and soil water capacity vs soil water were calculated by using above two results. From above calculated equations, the results shows that the water retention curve sharp declined when soil water potentials were between 0～300cm. Also, in corresponding to this characteristic, the soil water conductivity and soil water capacity were larger than those of clay when soil water potentials were between 0～300cm.

关 键 词：塔克拉玛干沙漠 水分特征曲线 土壤导水率 土壤水分扩散率 比水容量 最小二乘法 

分 类 号：S152.7[农业科学—土壤学]