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Distribution and budget of nitrogen and phosphorus and their influence on the ecosystem in the Bohai Sea and Yellow Sea |
ZHAO Chen-ying1, ZANG Jia-ye1, LIU Jun1,2, SUN Tao1, RAN Xiang-bin1 |
1. Research Center for Marine Ecology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;
2. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China |
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Abstract Based on results obtained from the comprehensive investigation in the Bohai Sea and the Yellow Sea (BYS), distributions and sources of dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP) in the sea water and sediment pore water in the study area were discussed; and a budget model of nitrogen (N) and phosphorus (P) in the BYS was established. Concentrations of DIN and DIP in the study area are affected by riverine input and benthic flux. The major sources of the DIN in the water column of the BYS are benthic diffusion, followed by the atmospheric deposition and inputs from adjacent rivers the groundwater and the East China Sea; while the dominant removals of DIN from water column in the BYS are phytoplankton utilization and sedimentation. The key sources of the DIP are phosphorus minerals desorption and weathering, accounting for 91%, followed by benthic flux and atmospheric deposition, then riverine flux and groundwater input; while the dominant outputs of DIP are sedimentation and the outflow to the East China Sea. There was a 11Gmol/a of nitrogen accumulated in the BYS, which would result in an increasing of DIN concentration by 0.6 μmol/(L·a). DIN concentrations and N/P ratio in the Bohai Sea and the Yellow Sea BYS kept increasing in recent decades due to the increasing of nitrogen N accumulation and phosphorus P sedimentation. Terrestrial nitrogen loadings might enhance the primary production and alter the structure and function of ecosystem, which had would have significant effects on the ecosystem of Bohai Sea and Yellow Sea the BYS in the long-time scale. We, therefore, should reduce the riverine nitrogen N loads to maintain the ecosystem stability in the BYS Bohai Sea and Yellow Sea.
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Received: 07 December 2015
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