title: Effects of dissolved oxygen on extracellular enzymes activities and transformation of carbon sources from plant biomass: implications for denitrification in constructed wetlands.
abstract: Dissolved oxygen (DO) concentrations have often been shown to be important to decomposition rates of plant litter and thus may be a key factor in determining the supply of dissolved organic carbon (DOC) and carbon-dependent denitrification in wetlands. During the 2 months operation, DOC accumulation in anaerobic condition was superior to aerobic condition due to higher activities of hydrolase enzymes and lower hydrolysates converted to gaseous C. Also, much higher denitrification rates were observed in wetland when using anaerobic litter leachate as the carbon source, and the available carbon source (ACS) could be used as a good predictor of denitrification rate in wetland. According to the results of this study, extracellular enzymes activities (EEAs) in wetland would change as a short-term consequence of DO. This may alter balance of litter carbon flux and the characteristics of DOC, which may, in turn, have multiple effects on denitrification in wetlands.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, PR China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Chen
authors.forename: Yue
authors.initials: Y
authors.lastname: Wen
authors.forename: Jing
authors.initials: J
authors.lastname: Cheng
authors.forename: ChongHua
authors.initials: C
authors.lastname: Xue
authors.forename: Dianhai
authors.initials: D
authors.lastname: Yang
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhou
mesh_terms: D018533:Biomass; D002244:Carbon / Q000737:chemistry*; D058440:Denitrification; D004789:Enzyme Activation; D004798:Enzymes / Q000737:chemistry*; D045604:Extracellular Fluid / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D032401:Typhaceae / Q000737:chemistry*; D053833:Wetlands
chemical_list: D004798:Enzymes; D002244:Carbon; D010100:Oxygen