Photo-and Bio-degradation of dissolved organic matter in mangrove pore-water

BAO Hongyan; WU Ying; ZHANG Jing

doi:10.3969/j.issn.0253-4193.2013.03.017

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BAO Hongyan, WU Ying, ZHANG Jing. Photo-and Bio-degradation of dissolved organic matter in mangrove pore-water[J]. Haiyang Xuebao, 2013, 35(3): 147-154. doi: 10.3969/j.issn.0253-4193.2013.03.017

Citation:

BAO Hongyan, WU Ying, ZHANG Jing. Photo-and Bio-degradation of dissolved organic matter in mangrove pore-water[J]. Haiyang Xuebao, 2013, 35(3): 147-154. doi: 10.3969/j.issn.0253-4193.2013.03.017

BAO Hongyan, WU Ying, ZHANG Jing. Photo-and Bio-degradation of dissolved organic matter in mangrove pore-water[J]. Haiyang Xuebao, 2013, 35(3): 147-154. doi: 10.3969/j.issn.0253-4193.2013.03.017

Citation:

BAO Hongyan, WU Ying, ZHANG Jing. Photo-and Bio-degradation of dissolved organic matter in mangrove pore-water[J]. Haiyang Xuebao, 2013, 35(3): 147-154. doi: 10.3969/j.issn.0253-4193.2013.03.017

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Photo-and Bio-degradation of dissolved organic matter in mangrove pore-water

doi: 10.3969/j.issn.0253-4193.2013.03.017

State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China

Received Date: 2012-10-09
Rev Recd Date: 2013-02-28

Abstract

Abstract

Terrestrial dissolved organic matter (DOM) exported from mangrove comprises an important fraction of terrestrial DOM in the ocean. The study of photo-and bio-degradation of mangrove DOM can help better understanding the fate of mangrove DOM and the role of mangrove DOM in the coastal biogeochemical cycle. Therefore, mangrove pore-water samples were collected in April 2010 to perform the photo-and bio-degradation of mangrove DOM. Dissolved organic carbon (DOC), density of bacteria and dissolved lignin phenols were measured in light(photo-degradation) and dark incubation (bio-degradation), respectively. The results showed that after 128 d dark incubation, DOC decreased from 2 216 μmol/L to 718 μmol/L, indicating that the bioavailability of mangrove pore-water DOC was approximately 70%; after 11 days exposure to the natural sunlight, DOC decreased from 2216 μmol/L to 800 μmol/L. The degradation rates of lignin phenols were much higher in light incubation(-0.132 d^-1) than dark incubation(-0.008 d^-1).During the light incubation, the degradation rates of lignin phenols were higher than DOC. The rates of photo-degradation of lignin phenols were different among different lignin groups, with the increase of sunlight exposure, the ratio of syringyl (S) phenols to vanillyl (V) phenols decreased and the ratio of vanillic acid to vanillin (Ad/Al)v increased. The comparison of the variations of DOC and lignin phenols during photo-and bio-degradation suggested that microbial consumption was the major factor for the removal of mangrove DOC and photo-degradation was the major factor for the removal of terrestrial DOM in water column. The comparison of the variations of bacteria during photo-and bio-degradation implied that light can improve the utilization of DOC by bacteria. The degradation rate of lignin in mangrove forest was close to Congo River sample, but higher than that of Mississippi River samples. However, the trends of S/V and (Ad/Al)v were similar as other regions.
- photo-degradation,
- bio-degradation,
- dissolved organic matter,
- lignin phenols,
- mangrove

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