The Effects of Land Utilization Type on Soil Property in Coastal Saline Alkali Wetland

The effects of four types of land utilization(i.e.cotton growing area，corn growing area，alfalfa growing area and natural reed area)on physicchemical factors and enzymatic activities in soil of Nandagang wetland were investigated in order to improve the property of saline alkaline soil.Results showed that the soil salinization in Nandagang wetland was severe.Compared to the alfalfa area and the natural reed area，pH was lower in the cotton and the corn area.Soil organic matter，total nitrogen，nitrate nitrogen，ammonium nitrogen，and total phosphorus(TP)were also relatively higher.Activities of alkaline phosphatase，dehydrogenase，and FDA hydrolase also were enhanced accordingly，which were related to high soil fertility.The crops could reduce the soil pH of Nandagang saline alkline land，increase the level of nutrients，and improve soil quality obviously.