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CHBr3 fluxes and controlling factors in tidal flat wetland of Jiaozhou Bay |
GONG Jian, XIE Wen-xia, CHAI Na |
Department of Environment Science and Engineering, Qingdao University, Qingdao 266071, China |
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Abstract Characteristics of methenyl bromide (CHBr3) fluxes from tidal wetlands of the Jiaozhou Bay were observed using static flux chambers methods during 2016/2017, and the key factors affecting CHBr3 fluxes were discussed. The results showed that CHBr3 average fluxes from S. alterniflora marsh and bare flat marsh were 10.92nmol/(m2×d) and 8.96nmol/(m2×d), respectively, indicating that the tidal marsh ecosystems in the Jiaozhou Bay acted as CHBr3 source. It indicates that S. alterniflora marshes could promote CHBr3 emissions to some extent. The emission fluxes of CHBr3 between different tidal marshes was distinctly different. The higher CHBr3 emissions from the S. alterniflora marshes were occurred in summer and autumn were probably related to the effects of temperature and vegetation biomass. The higher fluxes of CHBr3 in bare flat during early spring and winter may be related to the freeze-thaw cycle. The change of environmental factors in the tidal flat marsh of Jiaozhou Bay was complex, and the emission fluxes of CHBr3 were affected by many factors. The dominant factor affected the CHBr3 emission in S. alterniflora marsh of Jiaozhou Bay was temperature, while the influences of vegetation growth status and water and salinity condition and nutrient elements on the CHBr3 fluxes characteristics might not be ignored.
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Received: 16 December 2017
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