渭北旱塬不同覆盖措施的土壤水分分布特征

通过田间定位试验研究了渭北旱塬秸秆覆盖、地膜覆盖、秸秆加地膜覆盖及传统耕作保墒方式的土壤水分含量及动态变化 ,结果表明秸秆覆盖方法的保墒效果最好 ,2 m土层的有效水达 2 74.3 mm,比对照增加 3 3 .3 mm,降雨可下渗到 1 .6m。9月 1 5日分析 ,秸秆覆盖的表层土壤含水 2 9.9% ,地膜覆盖的 1 8.6% ,对照只有 1 3 .8%。

The method used in this study are plastic film beside mulching, plastic mulching, straw mulching, straw with plastic film mulching and no any mulching. From the field experiment these shown that the change characteristics of soil moisture of different mulching method in weibei rained area. The minimum tillage and straw mulching is the best method for conservation of soil moisture. The topsoil moisture content of straw mulching method and plastic film mulching are 21.9 percent and 29.9 percent respectively i...