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根据2008年春季(5月)和夏季(8月)在舟山附近海域调查监测资料,采用改良后的营养指数法,结合N/P(物质的量比)潜在性富营养化法,对该海域在春季和夏季的富营养化水平进行了评价,并分析了该海域富营养化的时空分布特征,对富营养化指数与环境因子的相关关系进行了讨论,同时对两种方法的结果进行了比较分析。营养指数法计算结果显示:舟山附近海域的富营养化程度较低,各调查站位富营养化指数均小于富营养化阀值;春季的富营养化水平高于夏季;春季、夏季富营养化指数的平面分布均表现出沿岸到离岸方向呈逐渐降低的特点;春季调查海域N/P平均值为17.35,略高于Redfield系数,夏季N/P平均值为56.34,具有明显的营养盐比例不平衡的特征。潜在性富营养化法计算结果显示:春季属于富营养水平,夏季属于磷限制潜在性富营养;富营养化指数与盐度、溶解氧、pH相关性均不显著,调查海域富营养化水平的时空变化主要受地表径流冲谈水、浮游植物、外海海流等的共同影响。
Based on the survey and monitoring data of waters around Zhoushan in the spring of 2008 (May) and summer (August), the improved nutrition index method and the potential eutrophication method of N / P The eutrophication level in spring and summer was evaluated, and the spatial and temporal distribution characteristics of eutrophication in this area were analyzed. The correlation between eutrophication index and environmental factors was discussed. At the same time, the results of two methods comparative analysis. According to the nutrition index method, the eutrophication of the waters near Zhoushan is low, the eutrophication index of each survey station is less than the eutrophication threshold, the eutrophication level in spring is higher than in summer, and the eutrophication in spring and summer The average N / P in the spring waters was 17.35, which was slightly higher than that of the Redfield coefficient. The summer N / P average was 56.34 with a significant proportion of nutrients Unbalanced characteristics. Potential eutrophication calculation results show that: the spring belongs to the level of eutrophication, the summer belongs to the phosphorus potential potential eutrophication; eutrophication index and salinity, dissolved oxygen, pH were not significant correlation, the eutrophication level Spatio-temporal changes are mainly affected by surface runoff, water, phytoplankton, and oceans.