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根据对环钦州湾区域的入海河流、直排海污染源及养殖废水无机氮入海通量的估算,2011年钦州湾无机氮入海通量约为7 655 t,其中入海河流无机氮入海通量占总量的96.4%,直排海污染源次之。入海无机氮占钦州湾无机氮总量的比重为36.7%,说明钦州湾已属中等强度人为影响海域。根据对钦州湾富营养化症状——叶绿素a含量的分析,钦州湾富营养化症状不明显,钦州湾整体的富营养化程度较低。因而仅以营养盐含量评价目标海域的富营养化程度,易失之偏颇,宜结合富营养化症状来判断目标海域的富营养化程度。
According to the estimation of the inland seawater flow into the sea, the in-line seawater and the inorganic nitrogen into the seawater in the Qinzhou Bay area, the influx of inorganic nitrogen in the Qinzhou Bay in 2011 is about 7 655 t, of which the influx of inorganic nitrogen into the sea reaches The amount of 96.4%, in-line sea pollution sources. The proportion of inorganic nitrogen in the sea to the total inorganic nitrogen in Qinzhou Bay was 36.7%, indicating that Qinzhou Bay is already a sea area with medium-intensity artificial influence. According to the eutrophication of Qinzhou Bay chlorophyll a content analysis, Qinzhou Bay eutrophication symptoms are not obvious, Qinzhou Bay overall eutrophication is low. Therefore, only the nutrient content of the target area to assess eutrophication, volatile bias, eutrophication symptoms should be combined to determine the target eutrophication.