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| Spatial Distribution of Nutrients in Sediments of the Maowei Sea |
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| KeyWord:Maowei Sea; sediment; nitrogen; phosphors; organic index |
| Author Name | Affiliation | | WU Wen-cheng | South China Institute of Environmental Sciences, MEP, Guangzhou 510655, China
College of Life Science, Sun Yat-Sen University, Guangzhou 510006, China | | REN Lu-lu | Guangdong Vocational College of Environmental Protection Engineering, Foshan 528216, China | | CAI Xin-de | South China Institute of Environmental Sciences, MEP, Guangzhou 510655, China |
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| Abstract: |
| Understanding environmental processes of nutrients（e.g., nitrogen and phosphorus） in sediments is crucial for fishery, environmental protection and management. Spatial distribution patterns of organic matter（OM）, total nitrogen（TN）, inorganic nitrogen（IN）, total phosphorus（TP） and soluble reactive phosphate（SRP） were investigated in surface sediments（0~30 cm） sampled at seven sites of the Maowei Sea in January 2010. Concentrations of OM, TN and IN decreased from the inner bay to the outer parts. Organic matter did not change at different depths, but concentrations of TN and IN tended to decrease with depths. Significant positive relationships were found amongst OM, TN and IN. Total phosphorus and SRP had low-high-low patterns from the inner to the outer and along depths, and were significantly correlated（r=0.96, P<0.01）. The nutrient index was averagely 0.06 across the sampling sites, with greater than 0.08 at three sites located in the inner bay, indicating high pollution of these sites. High C/N ratio suggested that nutrients in the sediments mainly came from terrestrial ecosystems. |
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