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利用2000年10～11月和2001年3～4月的调查资料,分析讨论了春、秋季东、黄海营养盐的分布变化特征及营养结构状况。结果表明:该海域表层营养盐高值主要出现在长江冲淡水影响区和江浙近海海域,低值出现于东海陆架区和黄海西北部,黄海中部水域春、秋季因温跃层强弱不同表层营养盐含量差别较大。东、黄海海域春、秋季表层水N/P、Si/N和Si/P值(除秋季黄海北部局部水域N/P值小于10外)均远高于Redfield比值。春季东海海域N/P、Si/N和Si/P值明显高于黄海海域,并高于秋季;秋季黄海海域N/P、Si/N和Si/P值要高于东海海域,变化也大于春季。在强温跃层存在期间和浮游生物旺发季节,表层水域N/P、Si/N和Si/P值原本高的区域往往进一步升高,而温跃层较弱或浮游植物生长繁殖能力较弱的季节,表层水域N/P、Si/N和Si/P值将略有降低。东、黄海水域浮游植物光合作用受N限制的可能性极小,绝大部分水域主要是受P限制,Si的含量普遍较高,它不可能成为限制因子。长江冲淡水区和江浙近海海域过量的N及高N/P值特性且持续升高的趋势可能是近20年来这一地区富营养化程度加剧、赤潮频发的主要原因。
Based on the survey data from October to November in 2000 and from March to April in 2001, the distribution and distribution of nutrients in the East and the Yellow Sea in spring and autumn were analyzed. The results showed that the high surface nutrient values of the waters mainly occurred in the affected areas of the Yangtze River and the coastal areas of Jiangsu and Zhejiang. The low values occurred in the shelf area of the East China Sea and the northwestern Yellow Sea. In spring and autumn, Salt content difference is bigger. Surface water N / P, Si / N and Si / P values in spring and autumn in the East China Sea and Yellow Sea were significantly higher than those in the Redfield except that the N / P values of the northern Yellow Sea waters in autumn were less than 10. The values of N / P, Si / N and Si / P in the spring East China Sea were significantly higher than those in the Yellow Sea and higher than those in autumn. The values of N / P, Si / N and Si / P in the Yellow Sea were higher than those in the East China Sea in autumn, spring. In the period of strong thermocline and the season of plankton bloom, the areas with high original N / P, Si / N and Si / P values in surface waters tend to increase further, while the thermocline is weak or the phytoplankton growth and reproduction capacity is more Weak seasons, surface waters N / P, Si / N and Si / P values will be slightly lower. Photosynthesis of phytoplankton in the East and Yellow Sea waters is extremely unlikely to be restricted by N, most of the waters are restricted by P and Si is generally high, and it is unlikely to be a limiting factor. The trend of excess N and high N / P value in the Yangtze River diluvial water area and the offshore Jiangsu-Zhejiang coastal waters is likely to be due to the increase of eutrophication and frequent occurrence of red tides in the past two decades.