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Circulation, biogeochemistry and carbon cycling in ocean margins
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POC export regulated by plankton community structure in a subtropical marginal sea
Monday 7th @ 1430-1450, Concert Hall
Yong Qiu, Fujian Provincial Key Laboratory of Coastal Ecology and Environmental Studies, State Key Laboratory of Marine Environmental Science, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China.
College of Oceanology and Food Science, Quanzhou normal university, Quanzhou 362000, China.
Yuyuan Xie, Fujian Provincial Key Laboratory of Coastal Ecology and Environmental Studies, State Key Laboratory of Marine Environmental Science, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China.
Edward Laws, Department of Environmental Sciences, College of the Coast and Environment, Louisiana State University, Baton Rouge, Louisiana, USA.
Bangqin Huang* , Fujian Provincial Key Laboratory of Coastal Ecology and Environmental Studies, State Key Laboratory of Marine Environmental Science, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China.
Presenter Email: bqhuang@xmu.edu.cn |
| Floating sediment traps were deployed at the marginal sea of the South China Sea in the western Pacific to studied POC flux in shelf, slope and basin ecosystems, in the summers between 2014 and 2017. As the biomass of phytoplankton community decreased gradually, the aggregate and zooplankton fecal pellets were both the main contributors of POC flux in the shelf and slope upper layer. Nevertheless, the main contributor to POC flux was zooplankton fecal pellets in the slope depth layer and basin. The contribution of zooplankton fecal pellets to the POC flux increased as the depth increased in shelf, slope and basin ecosystems. The cylindrical fecal pellets produced by the dominant zooplankton group copepods were the main types of zooplankton fecal pellets POC fluxes in the shelf, slope, and basin ecosystems. The dominated group of phytoplankton chlorophyll a biomass in sinking phytoplankton from traps were diatoms groups in all ecosystems. Phytoplankton regulated POC flux by aggregation and repackaging, while influencing aggregates and zooplankton fecal pellets production and sinking export.
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