Investigation on soil physicochemical properties in typical ecosystems of Saihanwula forest-steppe ecotone
In order to reveal the consequence of vegetation management on soil physical and chemical properties in the Saihanwula forest-grass ecotone of Inner Mongolia,this study collected the soil samples of grassland,planted forest and farmland at depths of 0 cm,10 cm,20 cm,40 cm,and 60 cm.By comparison of the soil properties and soil nutrients contents at different vegetation types,the results showed that:1)An obvious plough pan layer existed in the farmland,and the nutrients contents decreased rapidly below the plough pan layer.2)Grassland had low pH value but high organic carbon,whereas,the pH value at farmland is high but the organic carbon content is low.The planted forest has moderate soil properties between farmland and grassland,except for the low soil organic carbon at the shallow layers.3)Cropland soil nutrients were lower than the grassland,except for available phosphorus and total potassium.4)Correlation analysis revealed that,the soil organic carbon played a decisive role in soil physicochemical properties.This study indicates that soil properties of natural grassland,planted forest,and farmland were derived from the same parent materials.Different vegetation types and managements cause the difference of soil properties,and the soil organic carbon content plays a decisive role in determining the other nutrients contents.Therefore,the restoration of carbon fixation function was the utmost important for the protection of the other ecological functions such as wind-break and sand-fixation function.The conversion of farmland to grass is an appropriate measure for ecological restoration.The conversion of farmland to forest project should restore the herbage and shrub biomass on the forest floor.
Soil nutrientsforest-grass ecotonegrain to green projectcropland soil propertiesgrassland soil properties
NETL
NSTL
万方数据
