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根据2006年4月和2011年4月两个航次的调查数据,对比分析了桑沟湾水域春季水温、盐度及溶解无机氮(DIN)、活性磷酸盐(PO34-)、活性硅酸盐(Si23--Si)含量的时空分布特征,探讨了目前大面积赤潮暴发的可能原因。结果显示,2011年的氮、磷、硅浓度都高于2006年同期调查结果,分别是2006年的5.6倍,1.3倍和3.2倍。氮磷比高达(66.33±47.16),硅磷比为(35.12±21.44),硅氮比为(0.82±0.77),严重偏离Redfield比值。块状分布明显,氮、磷、硅的空间分布情况相似,都是在湾口的东南部(褚岛外海)有高值区,向湾内递减;在湾底的西北部赤潮的始发区,有次高值区,与盐度的低值区几乎重叠。从营养盐、水文、大型藻类营养盐竞争与克生作用及水温4个方面,分析了赤潮暴发的可能原因。
Based on the survey data of April, 2006 and April, 2011, the spring water temperature, salinity and dissolved inorganic nitrogen (DIN), active phosphate (PO34-), active silicate Si23 - Si), and discussed the possible causes of the current large area red tide outbreak. The results show that in 2011 the nitrogen, phosphorus and silicon concentrations were higher than the same period in 2006 survey results were 5.6 times in 2006, 1.3 times and 3.2 times. The ratio of nitrogen to phosphorus was as high as (66.33 ± 47.16), the ratio of silicon to phosphorus was (35.12 ± 21.44), and the ratio of silicon to nitrogen was (0.82 ± 0.77), which deviated seriously from the Redfield ratio. The block distribution is obvious. The spatial distributions of nitrogen, phosphorus and silicon are similar. Both of them are high in the southeastern part of the mouth of the mouth (Chuhai off the sea) and decrease toward the bay. In the starting area of red tide in the northwest of the bay, The next highest value area, and the low value area of salinity almost overlap. The possible reasons for the outbreak of red tide were analyzed from four aspects: nutrition salt, hydrology, nutrition competition of large-scale algae and its role in gobo and water temperature.