清水河县退耕还林工程建设对林下土壤物理性质修复效果分析

Effect of Returning Farmland to Forests Program on Restoration of Forest Soil Physical Properties in Qingshuihe County

研究内蒙古清水河县退耕还林区不同造林类型地和农田的土壤容重、土壤孔隙度、土壤水稳性团粒结构等土壤物理性质。结果显示：不同植被类型的土壤容重均比农田（1．31g／cm3）低7％～14％，为1．13—1．25g/cm3，差异较小；不同植被类型地各层土壤不同粒径的土壤团粒结构百分含量高于相应的农田，在所有的类型及土层中，中国沙棘不同粒径的水稳性团粒结构含量都是最高的；不同退耕还林饱和导水率均值比农田均值高2．73～11．55倍。以上分析结果表明实施退耕还林后，林地土壤物理性质得到明显改善。

The soil bulk density, soil porosity, soil crumb structure of different types of afforestation land and farmland in Qingshuihe County, Inner Mongolia were studied. The results showed that the soil bulk density of different vegetation types were lower than the farmland （ 1.31 g/cm3 ） 7% - 14%, and 1.13 - 1.25 g/cm3, the difference is small, the layers of soil size of different soil granular structure percentage is higher than the corresponding farmland vegetation types, of all the types and soil layer, Hippophae rhamnoides crumb structure stability of dif- ferent particle size of water content is the highest ; Saturated hydraulic conductivity of different types vegetation planting area is higher than cropland 2.73 - 11.55 times. The above analysis results showed that after the implementation of returning farmland to forest, the soil physical properties were improved obviously.