Study On Soil Microbial Activities In The Chongming Island Tidal Flat Wetland

" Reduce greenhouse-gas emission,Stop the global warming "has become a hot topic in international community.The way to reduce greenhouse gas emission effectively,and achieve the maximization benefit is also one of the research directions between domestic and foreign. Wetland is an ecosystem which has unique hydrology, soil, vegetation and biological characteristic condition, at the same time it stays at the transitional belt between terrestrial and aquatic ecosystems, so wetlands is known as the" kidney of the earth" because of the great environmental benefits and environmental function in water conservation, climate regulation, purification and other aspects of the environment.Take Chongming West Beach and Chongming Dongtan as examples,which are both tidal flat wetlands, to study light beach, reed wetland, woodland soil microbial activity and microbial dynamic changes in growth season among those area,in order to provide research basis for a deeper study of tidal flat wetland carbon sequestration mechanisms of microbiology.Chongming West Beach and East Beach both are the Estuary Tidal Mudflat Wetland type, at the same time be effected by the terrestrial ecosystem and marine ecosystem. A large amount of organic matter carried in the river get together in estuary area, form a huge organic matter accumulation library and special nutritional environment, tidal action promotes the organic exchanges between wetlands and rivers, so the estuary and coastal wetland soil carbon biological chemical conversion process becomes more complex. The paper start the research on carbon cycle of wetlands influence factors from three aspects.This paper analyses the soil basic pHysicochemical index, and the soil enzyme activity and microbial activity changes in growth season and non growing season to explore the relationship between different depth, salinity, soil enzyme activity.The experimental results show that the western part of pHysical and chemical properties, enzyme activities and microbial biomass are higher than Chong Dong's content, and each index in growth season and non growing season changes very much. Each index affected by soil depth is not obvious, but there is a cumulative peak in the soil layer of10～20cm or20～30cm.Wetland organic qualitative content analysis shows that, organic matter is higher during the growth season.The test of soil total nitrogen, total pHospHorus and soil respiration intensity finds that microbial activity, soil total nitrogen and total pHospHorus content is higher in vegetation growing season, but the total nitrogen and total pHospHorus content increased with the soil depth does not change obviously, the total nitrogen content is higher in the layer of10～20cm or20～30cm. Soil enzyme activity analysis indicates that soil invertase activity in the vegetation growing season is higher, but soil catalase activity, amylase activity and cellulase activity in non growing season are slightly higher than that in growth season, suggesting that the three enzyme activity is affected by season. But the change of enzyme activity decreases with soil depth is not very clear, in the soil layer of10～20cm or20～30cm is higher.Soil microbial biomass analysis shows that, soil microbial biomass C and soil microbial biomass N in vegetation growing season is higher than that of non growing season, there are positively correlation between soil microbial biomass C and soil microbial biomass N and organic matter changes, and microbial biomass C and microbial biomass N content shows a downward trend with the soil depth increases.The analysis of each index among optical flat, reed and forest, shows reed wetland in growth season and non growing season are both higher than light beach wetland and woodland wetlands, probably because the reed has a large root tissue, woodland content changes of tidal and litter effect.