中文摘要：

为分析不同农作物用地土壤团粒结构稳定性,揭示种植模式和作物生长对土壤质量的作用与影响,以晋西黄土丘陵区主要农作物用地土壤为研究对象,以分形维数D和矩法参数为指标,分析不同种类农作物用地土壤团聚体稳定性。结果表明：基于表层土壤团粒分形维数,土壤结构稳定性变化由强到弱依次为土豆、黍子、绿豆、黄豆、苹果、玉米、向日葵、核桃;基于表层土壤水稳性团粒分形维数,土壤结构稳定性变化由强到弱依次为绿豆、黄豆、土豆、向日葵、黍子、玉米、苹果、核桃;比较不同农作物用地0.25~3 mm粒径土壤团粒含量,得出土壤肥力变化由大到小依次为黍子、绿豆、黄豆、土豆、玉米、向日葵、苹果、核桃。用矩法的理论和特征参数评价得出：农作物用地0~20 cm深度的土壤偏度系数CS普遍小于20~40 cm土层;核桃地表层土壤偏度系数CS甚至转为负值;峰凸系数CE差异不大,均为负值。研究成果表明：人为干扰对表层土壤结构破坏作用明显,农作物用地土壤结构稳定性普遍较差。

英文摘要：

To analyze and compare the stability of soil aggregate under different land use for crops,and reveal the effect and influence of human activities and crops growth on soil quality,an experiment on farmland soil was con-ducted.Fractal dimension and moment method parameter were employed,and farmland soil in the hilly-gully re-gion of loess plateau in west Shanxi province is taken as research object.Results reveal that：1 ）according to the aggregate fractal dimension of surface soil,the stability of soil structure ranges in order of potato,millet,mung bean,soybean,apple,corn,sunflower and walnut from strong to weak;2）according to the fractal dimension of water-stable soil aggregate,the stability of soil structure ranges in order of mung bean,soybean,potato,sunflower, millet,corn,apple and walnut from strong to weak.The amount of soil aggregates （0.25 ~3mm）of millet is the highest,followed by mung bean,soybean,potato,corn,sunflower,apple and walnut.In consideration of the com-position of soil aggregates,water stable aggregates and the fractal dimension,the soil structure and stability of pota-to,millet,mung bean,soybean and apple are better,and that of walnut is the lowest among these eight crops.By using moment method and characteristic parameters we concluded that the value of CS of soil layer in depth 0 ~20cm is generally smaller than the CS in depth 20~40cm.The value of CS of walnut ground even is negative.The difference of convex peak coefficient （CE）is not obvious and are all negative.The research achievements suggest that the damage of human disturbance to the structure of surface soil is apparent and the soil structure of land use for crops is generally poor.