高塬沟壑区全坡面土壤水分布规律试验研究

为使造林树种与造林地合理配置，在高塬沟壑区的阴坡和阳坡分别采用集水造林、普通造林和荒山3种处理，对O～200cm土层水分分布规律进行了试验研究，结果表明：阴坡各层土壤含水率比阳坡高1．65～4．14个百分点，平均高2．58个百分点；在春季造林时，栽植营养钵苗深度为20cm和栽植大苗深度为40cm的土壤含水率，集水造林最高，荒山次之，普通造林最低，阴坡土壤含水率都高于15．19％，阳坡都低于11．51％。

Experimental Study on Soil Moisture Distribution Law of Total Slope of Gullied Loess Plateaus

In order to have rational configuration of species of trees and places of afforestation,it conducts experimental study on the law of water distribution at 0~200 cm layer by three methods of afforestation through collecting water,general afforestation and afforestation on barren hills respectively on both positive and shady slopes of gullied loess plateaus.The outcomes show that the soil moisture content at each layer is 1.65% ~ 4.14% higher in the shady slopes than that of the positive slopes,averaging 2.58% higher and;during afforestation in spring,the sequence of percentage of soil moisture content at depth of 20 cm for seedling in nutrition pot and 40 cm for matured seedling is afforestation through collecting water the highest,afforestation on barren hills the second and the general afforestation the lowest.All the percentage of soil moisture content of shady slopes is higher than 15.19% and the positive slopes lower than 11.51%.