Studies on Soil Nutrients and Enzyme Activities of Degraded Wetland in Napahai

Studies were made on nutrients and soil enzyme activities of degraded wetland in Napahai.The results showed that nutrients and soil enzyme activities differed obviously among different wetland types in Napahai.The contents of soil organic matter and total N were in the order of marsh >swampy marsh >cultivated land >sward;the enzyme activities of urease, invertase, protease and peroxidase in wetland soils were almost in the same order, but the activity of polyphenol oxidase in wetland soils was on the contrary.Enzyme activities in wetland soils were significantly related to soil nutrients.There were also correlations among different enzyme activities.So enzyme activities could be used as an index for soil fertility evaluation of degraded wetland.