黄土残塬沟壑区混农林系统土壤养分研究初报

Preliminary Survey of Soil Nutrients of Agroforest Systems in Gully Region of Loess Plateau

分析了1991～1992年淳化县泥河沟流域塬面的道路防护型和农桐间作型混农林系统土壤养分的试验资料,结果表明,虽然混农林系统土壤养分垂直分布规律与一般农田一样,但变化梯度大。而林木的存在对农田土壤养分的水平分布产生了明显的影响。

Analyses the characteristics of soil nutrients distribution in agroforest systems of Ni-he gully watershed, Chunhua County based on an investigation data of 1991-1992. The vertical distribution regularity of soil nutrients in agroforest systems is same as that in ordinary farms, except the variation gradient is greater. The presence of forest trees in agroforest systems influences the level distribution of soil nutrients of farmland obviously in the range from the trees to a distance of 25 times the tree height