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根据2010年3月、6月、9月和12月4个航次的调查数据,对钦州湾及邻近海域营养盐分布特征及富营养化水平进行了研究。结果表明,钦州湾及邻近海域DIN、PO4-P和SiO3-Si的平均浓度分别为265.7、13.1和669.6μg/L。NO3-N和NH4-N是调查海域DIN主要存在形式,分别占59.37%和43.93%。受茅岭江、钦江、大风江等冲淡水的影响,营养盐分布规律为从湾内向湾口逐渐降低,近岸高而向远岸逐渐降低,呈夏、秋季较高,春、冬季较低的趋势。富营养化指数(EI)范围为0.01~17.29,平均值为1.67,富营养化超标率为39.29%,夏、秋两季富营养化水平较高,COD在EI值构成中所占比例最大。近河口区海域测站主要为P限制,调查海域Si呈富足状态。应用浮游植物群落结构指数评价富营养化程度的结果显示,调查海域综合营养级(q)平均值为1.56,整体上属于中营养化水平,与化学指标的评价结果相比,春、秋两季富营养化水平较高,而一些外湾测站的富营养化水平较近岸测站高。
Based on the survey data of 4 voyages in March, June, September and December 2010, the distribution of nutrients and the level of eutrophication in Qinzhou Bay and its adjacent areas were studied. The results showed that the average concentration of DIN, PO4-P and SiO3-Si in Qinzhou Bay and adjacent waters were 265.7, 13.1 and 669.6μg / L, respectively. NO3-N and NH4-N are the main forms of DIN in the surveyed waters, accounting for 59.37% and 43.93% respectively. Affected by the influence of freshwater such as Maolingjiang, Qinjiang and Dafengjiang, nutrient distribution gradually decreased from the bay to the mouth of the bay and gradually decreased from the high coast to the far coast, showing a higher summer and autumn, lower spring and winter the trend of. The eutrophication index (EI) ranged from 0.01 to 17.29 with an average value of 1.67. The eutrophication over-standard rate was 39.29%. The eutrophication level was higher in summer and autumn, and the COD content was the largest. Nearly estuary sea station is mainly P limit, survey sea Si was rich state. The results of eutrophication evaluation using phytoplankton community structure index showed that the average value of comprehensive trophic level (q) in the surveyed sea area was 1.56, which was generally in the level of eutrophication. Compared with the evaluation results of chemical indicators, the spring and autumn seasons Eutrophication levels are higher, while some of the Outer Bay stations have higher eutrophication levels than nearshore stations.