梁子湖湿地土壤酶初步研究

Soil enzyme activities of wetland in Liangzi Lake

在梁子湖湿地区域内分别采取稻田、沉积物、荒滩、藕塘的土壤样品。测定了与土壤碳、氦、磷转化相关的多酚氧化酶、磷酸酶和脲酶的活性及有机质、N、P含量，分析了湿地土壤酶的活性与土壤有机质、N、P的关系。结果表明：尿酶的活性（以NH3-N计）在0．084-0．255mg·g^-1之间，磷酸酶的活性（以酚计算）在8．239～30．898mg·g^-1之间，多酚氧化酶的活性（以I2计）在0．577-1．467ml·kg^-1之间。脲酶可促进土壤全氮的降解转化。脲酶活性与土壤有机质、全N都呈显著正相关；磷酸酶的活性与土壤磷的转化关系密切。磷酸酶的活性与有机质、全P和速效P都呈正相关，但与有机质的相关性不显著；与速效P的相关性只在水田中达到显著水平；与土壤全磷的含量间相关性显著；多酚氧化酶的活性与土壤碳、氮、磷有密切关系。多酚氧化酶的活性与有机质、全N、全P的含量均呈负相关关系，与有机质的含量之间的负相关在水田和湖泊沉积物中达到显著水平。

Soil enzyme activity is closely related to ecosystem course and function. Tendency and intensity of different biochemical course carried on in the soil was reflected by enzyme activity. This paper deals with the soil enzyme activity, content of organic matter, N, P, and the relation of the enzyme activity with soil organic matter, N, P in soil of Liangzi Lake wetland by soil samples analyzed, and its result is hope to be the foundation to further study the shifting mechanisms of carbon, nitrogen, phosphorus in wetland, the wetland ecosystem course and setting up early sensitiveness index system for the wetland ecosystem restoration. The results shows that in the wetland soil, the urease activity is NH3-N 0.084-0.255 mg·g^-1; the phosphatase activity is phenol 8.239-30.898 mg·g^-1 ; polyphenol oxidase is I2 0.577-1.467 ml·kg^-1. The urease can promote the degradation and transformation of the total nitrogen in the soil. There is notably positive correlation between the urease activity and soil organic matter, total N. The activity of phosphatase has close relation with transformation of the soil phosphorus. There is positive correlation between the phosphatase activity and soil organic matter, total P and available P. There is notably positive correlation between the phosphatase activity and soil available P in the paddy field. The activity ofpolyphenol oxidase has close relations with soil carbon, nitrogen, phosphorus, Polyphenol oxidase activity is negative correlated with the content of organic matter, total nitrogen and total phosphorus.