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

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。结果表明，各种植模式土壤水分的季节变化具有明显差别，依据其变化特征可划分为3种类型；垂直梯度变化基本表现为增长型，标准差和变异系数可用于对其变化特征的描述和层次划分，据此划分出了速变层（0cm～20cm）和弱变层（20cm～50cm）2个差异明显的土壤水分垂直变化层。最后依据土壤水分的高效利用，对该区旱地种植模式的优化进行了探讨。

The law of soil moisture variation in different cropping patterns on dryland in hilly areas of Central Sichuan

Based on the data of observation in fixed location, the pilotstudy on the law of soil moisture variation in different cropping patterns on dryland in hilly area of Central Sichuan has been done. The results show that the differen ce of soil moisture seasonal variation in each cropping pattern is distinct, the cropping patterns can be divided into three types by the character of soil mois ture seasonal variation, the soil moisture vertical changes in different croppin g patterns on dryland has showed rising with the depth increased, the two index es of standard deviation and variation coefficient are used to describe the char acter of soil moisture vertical changes, the rapid variation layer (0 cm～20 cm) and the slow variation layer (20 cm～50 cm)are made off by this two indexes. Fina lly, based on the purpose of high efficient utilization of soil water, the optim ization of cropping patterns in hilly area of Central Sichuan is discussed.