锡林郭勒草地表层土壤粒度分形特征及其与风蚀的关系

在锡林郭勒草地以400 m为间距均匀布设160个样点，采集各点表层0~1 cm土样，测定土壤机械组成，计算土壤粒度分形维数，分析锡林郭勒草地景观尺度土壤粒度分形特征及其与风蚀的关系。结果表明：（1）分形维数越小，土壤质地越粗，分形维数与小于0.05 mm细颗粒含量显著正相关，与大于0.05 mm粗颗粒含量显著负相关；（2）分形维数随土地利用状况的变化趋势为禁牧>轻牧>中牧>重牧>耕地。在草地条件下，土壤容重值越大，分形维数越小；在耕地条件下，二者无显著相关关系；（3）分形维数越大，风蚀危险性越低，分形维数越小，风蚀危险性越高。

Fractal Characteristics of Surface Soils in the Xilinguole Grassland Landscape System and Its Relationship to Wind Erosion

A landscape scale transect was chosen in the Xilinguole grassland, in which 160 investigating and sampling points with an interval of 400 m were designed to collect surface soil in the depth of 0-1 cm. Soil particle distribution of the samples was determined, and the characteristics of fractal dimension of the soil particles as well as their relationship to wind erosion were analyzed. Results show that:(1) the smaller the fractal dimension is, the coarser the soil texture is. Fractal dimension has a significant positive correlation with fine particles smaller than 0.05 mm, and significant negative correlation with coarse particles larger than 0.05 mm. (2) The trend of fractal dimensions among different land use is ungrazed > lightly grazed > moderately grazed > heavily grazed > cultivated land. In grassland, the larger the soil bulk density is, the smaller the fractal dimension is. In cultivated land, there is no significant correlation between fractal dimension and soil bulk density. (3) The greater the fractal dimension is, the lower the wind erosion risk is. The smaller the fractal dimension is, the higher the wind erosion risk is.