| This study has analyzed the soil nutrients under different vegetation types in the Ziwuling Area.The results showed that the vegetation types made a remarkable effect on the soil nutrient content.The changing trend was that the content of total N,K and available N,P,K was basically in the order of trees>brush>grassland>farmland>abandoned field,which accorded with the vegetation succession.In addition,the total P content among the farmland,abandoned field,grass,bush and forest was rather steady.Therefore,in the hill of the Loess Plateau,converting cropland to forestland and grassland is good for improving the conditions of soil nutrient. |