Cycling of phosphorus in the Jiaozhou Bay |
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| Authors: | QI Xiaohong LIU Sumei ZHANG Jing REN Jingling and ZHANG Guiling |
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| Institution: | 1.Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education, Ocean University of China, Qingdao 266100, China2.Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education, Ocean University of China, Qingdao 266100, China;State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China |
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| Abstract: | Dissolved inorganic phosphorus (DIP), dissolved organic phosphorus (DOP), particulate inorganic
phosphorus (PIP) and particulate organic phosphorus (POP) in the Jiaozhou Bay (JZB) and
its adjacent major rivers were analyzed during 2001-2003. DIP was the major form of dissolved
phosphorus in JZB, representing 62%-83% of the total dissolved phosphorus (TDP), and the PIP
concentration generally exceeded the POP concentration. The concentrations of phosphorus were
higher in the north than in the south of the bay, which were related to the fluvial input and water
exchange rate. The dissolved phosphorus concentrations were higher in the autumn and spring than
in the summer, while the seasonal variation of particulate phosphorus showed opposite pattern. The
distribution of phosphorus is mainly affected by the growth of phytoplankton, desorption/adsorption
of DIP from and to particulates, and anthropogenic activities. A preliminary phosphorus budget
was established. In JZB, riverine input and water exchange flow between JZB and the Huang-
hai (Yellow) Sea are the major sources of phosphorus, followed by industrial and domestic waste
transport, and then atmospheric deposition. Phosphorus burial efficiency is estimated to be 91%.
About 52.2×106 mol/a of phosphorus were assimilated by phytoplankton, of which about 68% was
recycled in the water column and sediment. |
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| Keywords: | phosphorus cycling suspended particulate matter sediment rive the Jiaozhou Bay |
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