Changes in available nutrient content of coastal light loamy saline soil during the process of forming fluviogenic soil in Jiangsu Province [China]

azote coastal plains coastal soils disponibilidad de nutrientes fertilidad del suelo fosforo jiangsu llanura costera nitrogen nutrient availability pedogenese phosphore phosphorus potasio potassium saline soils soil fertility soil genesis sol littoral sol salin suelo costero suelo salino