title: Influences of sediment dessication on phosphorus transformations in an intertidal marsh: formation and release of phosphine.
abstract: This study investigated the effects of sediment dewatering on the phosphorus transformations concerning about the production and emission of phosphine in the intertidal marsh of the Yangtze Estuary. The concentrations of matrix-bound phosphine ranged from 18.62-72.53 ng kg(-1) and 31.14-61.22 ng kg(-1) within the August and January exposure incubations, respectively. The responses of matrix-bound phosphine concentrations to sediment dessication demonstrate that the production (or accumulation) of matrix-bound phosphine significantly increased with water loss at the start of the emersion incubations. However, further dehydration inhibited the formation of matrix-bound phosphine in sediments. The significant correlations of matrix-bound phosphine with the organic-P bacteria abundance and alkaline phosphatase activities implicate that the production of matrix-bound phosphine within the dessication incubations was linked closely to the microbial decomposition of organic P. The emissions of phosphine generally decreased with sediment dewatering, with the fluxes of 7.51-96.73 ng m(-2)h(-1) and 5.34-77.74 ng m(-2)h(-1) over the exposure incubations of both August and January, respectively. Also, it is observed that the releases of phosphine during the entire exposure periods were affected not only by its production but also by sediment water and redox conditions.
authors.affiliation: State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, People's Republic of China. Ljhou@sklec.ecnu.edu.cn
authors.forename: Lijun
authors.initials: L
authors.lastname: Hou
authors.forename: Min
authors.initials: M
authors.lastname: Liu
authors.forename: Pingxing
authors.initials: P
authors.lastname: Ding
authors.forename: Junliang
authors.initials: J
authors.lastname: Zhou
authors.forename: Yi
authors.initials: Y
authors.lastname: Yang
authors.forename: Di
authors.initials: D
authors.lastname: Zhao
authors.forename: Yanli
authors.initials: Y
authors.lastname: Zheng
mesh_terms: D003890:Desiccation; D019015:Geologic Sediments / Q000737:chemistry*; D044367:Phase Transition; D010720:Phosphines / Q000032:analysis / Q000737:chemistry*; D010758:Phosphorus / Q000032:analysis / Q000737:chemistry*; D012621:Seasons; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D014877:Water Pollution, Chemical / Q000706:statistics & numerical data; D053833:Wetlands
chemical_list: D010720:Phosphines; D014874:Water Pollutants, Chemical; D010758:Phosphorus; C044646:phosphine