title: Water organic pollution and eutrophication influence soil microbial processes, increasing soil respiration of estuarine wetlands: site study in jiuduansha wetland.
abstract: Undisturbed natural wetlands are important carbon sinks due to their low soil respiration. When compared with inland alpine wetlands, estuarine wetlands in densely populated areas are subjected to great pressure associated with environmental pollution. However, the effects of water pollution and eutrophication on soil respiration of estuarine and their mechanism have still not been thoroughly investigated. In this study, two representative zones of a tidal wetland located in the upstream and downstream were investigated to determine the effects of water organic pollution and eutrophication on soil respiration of estuarine wetlands and its mechanism. The results showed that eutrophication, which is a result of there being an excess of nutrients including nitrogen and phosphorus, and organic pollutants in the water near Shang shoal located upstream were higher than in downstream Xia shoal. Due to the absorption and interception function of shoals, there to be more nitrogen, phosphorus and organic matter in Shang shoal soil than in Xia shoal. Abundant nitrogen, phosphorus and organic carbon input to soil of Shang shoal promoted reproduction and growth of some highly heterotrophic metabolic microorganisms such as β-Proteobacteria, γ-Proteobacteria and Acidobacteria which is not conducive to carbon sequestration. These results imply that the performance of pollutant interception and purification function of estuarine wetlands may weaken their carbon sequestration function to some extent.
authors.affiliation: Key Laboratory of Yangtze River Water Environment, Ministry of Education, School of Environmental Science and Engineering, Tongji University, Shanghai, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Yangtze River Water Environment, Ministry of Education, School of Environmental Science and Engineering, Tongji University, Shanghai, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.affiliation: Key Laboratory of Yangtze River Water Environment, Ministry of Education, School of Environmental Science and Engineering, Tongji University, Shanghai, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Hu
authors.affiliation: Key Laboratory of Yangtze River Water Environment, Ministry of Education, School of Environmental Science and Engineering, Tongji University, Shanghai, China.
authors.forename: Xuefei
authors.initials: X
authors.lastname: Xi
authors.affiliation: Key Laboratory of Yangtze River Water Environment, Ministry of Education, School of Environmental Science and Engineering, Tongji University, Shanghai, China.
authors.forename: Yushu
authors.initials: Y
authors.lastname: Tang
authors.affiliation: Key Laboratory of Yangtze River Water Environment, Ministry of Education, School of Environmental Science and Engineering, Tongji University, Shanghai, China.
authors.forename: Jinhai
authors.initials: J
authors.lastname: Chen
authors.affiliation: Key Laboratory of Yangtze River Water Environment, Ministry of Education, School of Environmental Science and Engineering, Tongji University, Shanghai, China.
authors.forename: Xiaohua
authors.initials: X
authors.lastname: Fu
authors.affiliation: Shanghai Jiuduansha wetland Nature Reserve Administration, Shanghai, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Sun
mesh_terms: D002244:Carbon; D002681:China; D005068:Eutrophication; D009584:Nitrogen; D010758:Phosphorus; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D014876:Water Pollution; D060753:Water Quality; D053833:Wetlands
chemical_list: D012987:Soil; D010758:Phosphorus; D002244:Carbon; D009584:Nitrogen