The Analysis Of Bio-activity And Relativity Of Different Type Wetlands Soil In Chongming Dongtan

To attain the ecological effect, the influence of the agricultural mode to the fertility and bio-activity in inning lands, three types of wetlands in Chongming (Area A, B, and C) are chosen as the research target. Purification ability and carbon accumulaition ability are analyzed by measuring the microbial biomass, enzyme activity, organic matter of the wetlands soil. And it is possible to estimate the fertility and bio-activity of the inning lands soil by different utilization mode. The result could be contributed to optimize the management of the wetlands and improve the ecological effect of the soil. Also the result could provide the theory basis for the design of different type of constructed wetlands.The result shows that the concentration of organic matter in area A is the lowest, but the microbial biomass and enzyme activity which is related to carbon metabolism is the highest in the wetlands of the outer levee. It shows that the sandy soil of bulrush wetland is favorable for the breath, metabolism and propagation of microbe. And the purification ability to organic pollution of area A is stronger than area B and C. However, the concentration of organic matter, nitrogen and phosphorus in area B and C is higher than area A, but the microbial biomass is lower than other areas. Therefore, the viscous soil of brush/spartina alterniflora wetlands is suitable for the transformation of nitrogen and phosphorus.As the the wetlands in Chongming Dongtan close to the ocean, it may be polluted by the oil contaminants. The experimental results show that the soil of three wetlands has been polluted by the oil pollutants. The oil concentration of area C is the highest. The efficiency of degradation could be 34% by bio-renovation of high efficient bacteria after 28 days. However, the bio-activity of the wetlands is not influenced by the oil pollutants seriously.The mode of the inning lands in Chongming is: area A is used to plant paddy; area B is used to breed fish; area C is used to plant vegetable. In the inning lands of the inner levee, the organic matter, microbial biomass and enzyme activity (except catalase) area C is the highest, area A is the second and area B is the lowest. It shows that the fertility and bioactivity of the inning land could be improved by breeding fish, planting paddy and planting vegetable orderly. The mode of ordinal utilization of the inning lands could produce much more economic benefit. Furthermore, the mode could improve the property of the soil and enhance the fertility and bioactivity of the soil.In this paper, the organic matter, microbial biomass, organic pollutions and enzyme activity of different types of wetlands in the outer-levee are analyzed to find the ecological effect and purification ability of different wetlands. And the indexes above are also analyzed to confirm the fertility and bioactivity of the inning lands in the inner-levee. And the research results would provide theory basis for the protection and optimization of the natural wetlands, the renovation and reasonable utilization of the inning lands.