滇东喀斯特石漠化区不同植被恢复模式下土壤水分空间变异特征研究

分析了7种不同植被恢复模式的土壤容重和水分等土壤特性的变异及分布特征．结果表明，土壤容重变异较小，土壤水分含量变化相对较大．不同植被恢复模式之间，天然成熟林的含水量最大，新造林最低；不同坡位之间，以下坡的含水量最大．容重变化与水分含量变化恰好相反．通过研究滇东喀斯特石漠化地区不同年龄植被在不同坡向、坡位、石漠化程度等条件下土壤水分的空间变异规律，为滇东喀斯特石漠化地区的植被建设和规划提供理论依据和实践依据．

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

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 he 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.