黄土高原丘陵沟壑区土壤水分变化规律的研究

Study on dynamic laws 0f soil moisture in hilly area 0f the Loess Plateau

摘要: 对黄土高原丘陵沟壑区土壤水分变化规律研究结果表明，该区土壤水分随时间变化主要受控于降水量，表现为与降水量变化同步。土壤水分垂直分布变化0-30cm土层土壤含水量随深度增加而减少，30～120cm土层土壤含水量随深度增加而增加，总体变化趋势平缓。裸地和农田土壤水分空间变异范围分别为3．17m和7．25m。

Abstract: The dynamic laws of soll moisture in hilly areas of the Loess Plateau are studied in this paper．The results show that the precipitation is the most important factor to determine the tempo ral change of soil moisture；the soil moisture decreases from Ocm to 30cm and increases from 30cm to 120cm and the total changing trend is slowly；the ranges of spatial variability of soil moisture for bareness and farmland are 3．17m and 7．25m respectively．