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根据2011年9月和2013年8月在柘林湾11各位点采样调查,以化学需氧量(COD)、总氮(TN)、总磷(TP)、叶绿素a(Chla)和溶解氧(DO)为评价指标,采用隶属度模糊综合法对柘林湾海域海水富营养化水平进行评价,并与营养状态质量指数法(NQI)评价结果比较。研究表明,柘林湾西北部海域COD、TN和TP浓度较高,DO浓度较低;2011年COD、TN和Chla在各位点浓度较2013年高。海域各位点2011年全部处于富营养化水平,2013年部分位点营养水平降低。据隶属度权重分析,柘林湾海水富营养化形成主要因素是TN、TP和DO。隶属度模糊综合法对柘林湾海域营养水平评价结果与NQI基本一致。柘林湾海水富营养化主要是由养殖污染、陆源输入污染和航运污染造成,且后二者影响有逐渐增加趋势。
According to the sampling survey conducted in September 2011 and August 2013 in each of the 11 sites in Zhelin Bay, the chemical oxygen demand (COD), total nitrogen (TN), total phosphorus (TP), chlorophyll a (Chla) and dissolved oxygen DO) were used to evaluate the eutrophication level of seawater in Zhelin Bay by fuzzy membership method. The results were compared with the results of NQI (Nutrient Quality Index Method). The results showed that the concentrations of COD, TN and TP in the northwestern part of Zhelin Bay were higher and the concentrations of DO were lower. The concentrations of COD, TN and Chla in 2011 were higher than those in 2013. All sites in the sea area were in eutrophication level in 2011, and nutrient levels decreased in some sites in 2013. According to the analysis of membership degree and weight, the main factors of seawater eutrophication in Zhelin Bay are TN, TP and DO. Membership fuzzy comprehensive method for the assessment of the nutritional level of Zhelin Bay sea area results and NQI basically the same. The seawater eutrophication in Zhelin Bay is mainly caused by aquaculture pollution, land-based input pollution and shipping pollution, and the influence of the latter two is gradually increasing.