Temporal and spatial distributions of nutrients under the influence of human activities in Sishili Bay,northern Yellow Sea of China |
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| Institution: | 1. Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, 17 Chunhui Road, Yantai City, Shandong Province, China;2. Shandong Marine Resource and Environment Research Institute, 216 Changjiang Road, Yantai City, Shandong Province, China;3. Ludong University, 186 Red Flag Middle Road, Yantai City, Shandong Province, China;4. University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing City, China |
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| Abstract: | The temporal and spatial distributions of dissolved inorganic nitrogen (DIN), dissolved organic nitrogen (DON), soluble reactive phosphorus (SRP) and dissolved reactive silica (DRSi) together with chlorophyll-a, temperature and salinity were analyzed monthly from December 2008 to March 2010 at four zones in Sishili Bay located in the northern Yellow Sea. The nutrient distribution was impacted by seasonal factors (biotic factors, temperature and wet deposition), physical factors (water exchange) and anthropogenic loadings. The seasonal variations of nutrients were mainly determined by the seasonal factors and the spatial distribution of nutrients was mainly related to water exchange. Anthropogenic loadings for DIN, SRP and DRSi were mainly from point sources, but for DON, non-point sources were also important. Nutrient limitation has changed from DIN in 1997 to SRP and DRSi in 2010, and this has resulted in changes in the dominant red tide species from diatom to dinoflagellates. |
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