锡林郭勒草地表层土壤粒度分形特征及其与风蚀的关系  

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

作　　者：孙传龙 张卓栋[1] 邱倩倩 刘亮[1] 

机构地区：[1]北京师范大学地理学科学学部地理学院,北京100875

出　　处：《中国沙漠》2017年第5期978-985,共8页Journal of Desert Research

基　　金：国家自然科学基金项目(41301282)

摘　　要：在锡林郭勒草地以400m为间距均匀布设160个样点,采集各点表层0~1cm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0.05mm细颗粒含量显著正相关,与大于0.05mm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。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 than0.05 mm,and significant negative correlation with coarse particles larger than0.05 mm.（2）The trend of fractal dimensions among different land use is ungrazedlightly grazedmoderately grazedheavily grazedcultivated 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.

关 键 词：土壤粒度 分形维数 土地利用 风蚀危险性 锡林郭勒草地 

分 类 号：S151.9[农业科学—土壤学] S157.1[农业科学—农业基础科学]