东海区典型断面营养盐潜在性富营养化评价

Analysis of Nutrient Distributions and Potential Eutrophication in Seawater of the East China Sea Nearly Two Decades

根据1989年至2010年丰水期东海区3条断面表层营养盐调查结果，分析近20年来东海典型断面丰水期无机氮、活性磷酸盐、硅酸盐长期变化。结果表明：（1）1989—2010年东海区表层水体中无机氮从1996年开始波动浓度范围明显增大，无机氮的最大浓度增加到1989年的2．15～5．94倍，平均值浓度为1989年的1．80～6．75倍；（2）活性磷酸盐在1989—2010年呈现历年增大的变化趋势。活性磷酸盐的平均浓度是1989年的1．44～9．22倍，在2005年达到最高；（3）硅酸盐的浓度在0．00～107．17μmol／L，波动较大，除了2002年最大浓度骤降外，整体基本呈现上升趋势；（4）从总体上看，除长江口附近3—5个测站外，表层水体基本为贫营养，总体上营养水平很低，水质质量较好。

Based on the investigation data of nutrient and phytoplankton obtained from the East China Sea in Auguest from 1989 to 2010, this paper dealt with the nutrient distribution, trophic level state and potential eutrophication. It is shown that, for surface seawater, the maximum concentration of inorganic nitrogen （DIN） to 2.15-5.94 times in 1989, average concentration of 1989 1.80-6.75 times; The average activity concentration of phosphate is 1.44-9.22 times that in 1989, the highest in 2005; Silicate concentration in the 0.00-107.171a, mol / L, volatile, in addition to the maximum concentration of 2002 plummeted, the overall base on the rise; Overall, in addition to 3-5 Stations near the CHANGJIANG River, the surface water basic nutrition for the poor, the low level of general nutrition, good water quality.