Changes of Soil Physical Properties and Moisture among Different Vegetation Restoration Types

Abstract：The changes of soil physical properties and moisture during 5 different vegetation restoration types（natural grassland,enclosed grassland,abandoned land,land as returning farmland to grassland,fixed sandy land） were studied in Yanchi County where located in the ecotone of agriculture-animal husbandry of China,with the method substituting spatial sere for time course.The results showed that： enclosed grassland,returning farmland to forests land and fixed sandy land,which were the combination of shrub and herb,played a role in reducing soil bulk density better than natural grassland and abandoned land with mainly herb.There were significantly differences in soil porosity among different vegetation types,the type whose roots were better vertical distribution improved deep soil better.Fencing,returning farmland to forests and other artificial vegetation restoration measures could reduce soil bulk density,increase porosity,and improve soil structure and physical properties,but also need a long time to improve the soil texture.There were obviously differences in soil moisture among the different vegetation restoration types,which may be closely related to the bulk density and porosity and other physical properties of soil and vegetation distribution.