強(qiáng)降雨對膠州灣生源要素補充和分布的影響
[Abstract]:The heavy rainfall caused by typhoons can transport a large amount of fresh water and source elements from land to offshore, which will have a significant impact on the hydrologic and biogeochemical processes in the coastal waters in a short period of time. This paper takes Jiaozhou Bay, a typical semi-enclosed bay, as the research object, and takes the heavy rainfall event brought about by Typhoon "Davi" in 2012 as the background. The effects of heavy rainfall on the input, concentration and composition of source elements in Jiaozhou Bay were investigated by means of the input of source elements into the gulf and the input of wet subsidence and the synchronous investigation of marine distribution before and after rainfall. The results show that during heavy rainfall, the flux of source factor DIN,SiO3-Si,PO4-P input through river and wet deposition is 2.7, 19.7 and 25.6 times higher than that before rainfall, respectively. Accordingly, the average concentration of DIN,SiO3-Si,PO4-P in the surface seawater of Jiaozhou Bay reached (37.90 鹵26.72), (20.18 鹵17.22) and (1.75 鹵1.28) 渭 mol 路L-1 respectively, which was 1.5, 2.4 and 2.3 times higher than that before rainfall, respectively. At the same time, the structure of source elements in Jiaozhou Bay changed obviously, and the ratio of N/Si/P changed from 24:8:1 before rainfall to 19 脳 10 ~ 1 after rainfall, which was closer to Redfield value and suitable growth of phytoplankton. Further analysis of eutrophication index (EI) showed that the eutrophication degree increased after rainfall, and the mean EI index increased from (4.35 鹵6.40) before rainfall to (13.71 鹵21.20) after rainfall. At the same time, the area of severe eutrophication area of EI5 after rainfall was up to 50%. The above analysis indicates that the heavy rainfall caused by typhoon provides a large number of biological elements suitable for phytoplankton growth, which may be the cause of the aggravation of eutrophication in Jiaozhou Bay.
【作者單位】: 中國海洋大學(xué)海洋化學(xué)理論與工程技術(shù)教育部重點實驗室;中國海洋大學(xué)化學(xué)化工學(xué)院;青島市環(huán)保局;青島市環(huán)境監(jiān)測中心站;
【基金】:國家海洋局公益性課題項目(201205018) 中央高;緲I(yè)務(wù)費項目(201362014)資助~~
【分類號】:P734;X55
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