Water Retention Capability of Yellow Soil Reservoir and Its Fractal Dimension Estimation in the Karst Area

Choosing three kinds of yellow soil in Qianjiang district of Chongqing as the research objects,this paper discussed the basic characteristics of their soil reservoir,and figured out the water retention capacity of soil reservoir based on soil fractal dimension calculated by soil particle size distribution.The results showed that,①the water retention capacity of soil reservoir of the yellow soil in karst area was influenced by bulk density,organic matter,soil particles,as well as the soil depth.②Field capacity,wilting coefficient and the water retention capacity of soil reservoir of tested soil could be estimated by the fractal dimension(D1) based on the relationship between soil particle size and soil particle number and the fractal dimension(D2) based on the relationship between soil particle size and soil particle weight,however,much poorer result in the deeper soil.③The prediction of wilting coefficient was poorer than that of the field capacity,resulting in the same poorer estimation in available water storage capacity and non-available water storage capacity.