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.
journal_name
Chemospherejournal_title
Chemosphereauthors
Hou L,Liu M,Ding P,Zhou J,Yang Y,Zhao D,Zheng Ydoi
10.1016/j.chemosphere.2011.02.041subject
Has Abstractpub_date
2011-05-01 00:00:00pages
917-24issue
7eissn
0045-6535issn
1879-1298pii
S0045-6535(11)00187-1journal_volume
83pub_type
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