黄土丘陵区退耕还林(草)土壤环境效应

Based on sampling and analyses,the effects on soil nutrients of different types of land use, different vegetative measures in sloping cultivated land and different years of vegetative restoration were studied.The results show that:there are,to some degree,degenerated phenomenon in the soil of cultivated land,the contents of nutrient and soil organic matter are relatively low;comparing with the different methods of restoration,the contents of available N,K and soil organic matter are relatively low,while the...