高原湿地纳帕海退化土壤养分与酶活性研究

对滇西北纳帕海退化湿地土壤养分与酶活性的系统研究表明：人为活动干扰下不同湿地类型间土壤养分及酶活性存在明显差异；土壤有机质、全氮含量从原生沼泽向沼泽草地、草地、耕地逐渐减少；土壤脲酶、蔗糖酶、蛋白酶和过氧化氢酶的活性大小顺序也呈现出相同的趋势，多酚氧化酶则与此相反．经分析比较，土壤酶活性和土壤养分退化密切相关，且不同酶活性间也存在相关性，较好地反映了土壤退化程度，可作为评价该地区高原湿地土壤肥力的敏感指标。

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.