研究黄土高原土壤水分变化规律，有着极其重要的科学和实际意义。
That has practical and scientific significance to study the dynamic law of soil moisture.
利用定位观测数据，对四川中部丘陵地区不同种植模式下旱地土壤水分变化规律进行了初步研究。
Based on the data of observation in fixed location, the pilot study on the law of soil moisture variation in different cropping patterns on dryland in hilly area of Central Sichuan has been done.
依据定位观测数据，对紫色土丘陵区农用地土壤水分的动态变化规律进行了初步研究。
Based on the data of observation in fixed location, the pilot study on soil moisture dynamic variation law of farmland in purple soil hilly region has been done.
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