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Bridging microbial diversity and chemodiversity of dissolved organic matter to better constrain processes in biogeochemical cycles
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Marine microbially-mediated transformations of phytoplankton-derived LDOC into RDOC
P-M4-09
Qiang Zheng* , State Key Laboratory for Marine Environmental Science, Institute of Marine Microbes and Ecospheres, Xiamen University, Xiamen 361102, People's Republic of China.
Qi Chen, State Key Laboratory for Marine Environmental Science, Institute of Marine Microbes and Ecospheres, Xiamen University, Xiamen 361102, People's Republic of China.
Ruanhong Cai, State Key Laboratory for Marine Environmental Science, Institute of Marine Microbes and Ecospheres, Xiamen University, Xiamen 361102, People's Republic of China.
Nianzhi Jiao, State Key Laboratory for Marine Environmental Science, Institute of Marine Microbes and Ecospheres, Xiamen University, Xiamen 361102, People's Republic of China.
et al.,
Presenter Email: zhengqiang@xmu.edu.cn |
| Marine phytoplankton contribute to almost one-half of the global primary production (Falkowski et al., 1998; Field et al., 1998; Azam and Malfatti, 2007). A variable fraction of carbon fixed by phytoplankton is released into seawater as dissolved organic matter (DOM) and particulate organic matter (POM) via secretion, natural death, viral lysis and protists predation. These phytoplankton released organic matters are the foundation of the microbial loop, which are directly processed by heterotrophic bacteria. Bacterially transformed these organic matters has several different fates, and most of them were respired back to CO2. Some of them are converted into microbial biomass which can return into the classic marine food web by prey-predator interaction. A small fraction of microbially released dissolved organic carbon (DOC) resists further degradation and contributed to the huge recalcitrant DOC (RDOC) pool which represents >90% of the total DOC reservoir in the ocean. Microbial production of RDOM with 43 Tg C per year plays significant roles in carbon sequestration in the ocean. However, the chemical complexity of DOM and genetic diversity of microbes hampered our understanding about their interactions. With the development of high throughput sequencing, a great number of studies report the marine bacterial metabolic potential. How marine bacteria transform phytoplankton-derived carbon into RDOC is still a puzzle.In this study we tried to reveal the process from photosynthate to marine RDOC. |
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