冀西北风沙半干旱区农田土壤水分动态分析

DYNAMIC ANALYSIS OF SOIL WATER CONTENT IN THE NORTHWEST AEALIAN SEMI-ARID REGION FARMLAND OF HEBEI PROVINCE

根据土壤水分定位观测结果,结合当地气候条件、作物生长过程和土壤物理性状等因子,对河北坝上不同土壤类型的土壤水分动态季节性垂直变化,以及土壤水分与降雨的关系进行了分析,得出了该区旱坡地、滩地土壤水分季节性变化规律,可概括为失墒期、耗墒期、补墒期、缓慢失墒期四个时期,并且提出了该区提高农田水分利用率的几项主要措施。

According to the results of fixed position observation of soil water content, local climatic conditions, crop growth procession and siol physical features, the dynamic seasonal and perpendicular changes of soil water cowtent and rainfall were andysized in different soil types in Bashang region, Hebei province. The soil water content seasonal chang law was obtained which soil water content changed following the four stages (soil moisture loss stage, soil moisture consuming stage, soil moisture suppling stage and soil moisture slow loss stage). At the same time, several key measures of improving this region farmland water vtilization ratio were pointed out in this paper.