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Spatial Variability of Soil Water in Karst Rocky Desertification Area in the Eastern Part of Yunnan Province

SU Yue1,2,3,HE Bing-hui1,YAO Xiao-hua2,3,REN Hua-dong2,31.School of Resources and Environment,Southwest University,Chongqing 400716,China;2.Research Institute of Subtropical Forestry,CAF,Fuyang Zhejiang 311400,China;3.Key Laboratory of Subtropical Forest Silviculture of the State Forestry Administration,Fuyang Zhejiang 311400,China  
Karst is one of the weakest kinds of ecological environments and one of the main factors that restricts economic development in southwest of China.A field study of distribution of soil water contenting in different directions and locations in karst rocky desertification area was out to make clear the characteristics,which can be used for the ecological reconstruction in the rocky desertification in karst area in eastern part of Yunnan.And restoring vegetation and improving soil quality is among urgent affairs of the region.The badly vegetation construction resulted in the serious loss of soil and water in this region.So it is necessary to reconstruct the vegetation in karst rocky desertification area.But the vegetation construction is limited by the distribution of soil water in large degree.So it is important to research the spatial distribution of soil water on slope.In this paper seven vegetation models were selected to study the spatial variability of soil water and bulk density.The results indicated that there was little difference in bulk density among different vegetation models,but more in soil water.In different vegetation models,soil water of virgin forest is the highest,but of new young forest is the lowest.In different positions of slope,soil water in lower slope is the highest.The tendency of bulk density is opposite from soil water.The distributions of water on slope in different directions and locations were different.The result also showed that it is important for the reconstruction of vegetation in karst rocky desertification area to supply enough water.
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