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根据2012年9月底对莱州湾沿岸河流和邻近海域表层水体中Chl a和相关环境参数的调查,分析了Chl a在该区域的分布、影响因素、富营养化状况以及变化趋势。莱州湾沿岸河流Chl a浓度平均值为51.9μg/L,邻近海域为3.9μg/L。在沿岸河流,与Chl a呈显著正相关的仅有悬浮颗粒物(SPM),而在邻近海域,与Chl a呈显著正相关的有SPM、PO4-P、NH4-N、NO3-N。氮和磷都是莱州湾近岸海域Chl a的限制因子,其中氮的限制作用较大。莱州湾沿岸河流水体的富营养化程度主要表现为过度和高度富营养化,近岸海域水体的富营养化程度则主要表现为低度富营养化。沿岸河流高浓度的氮磷汇入,将会促进莱州湾近岸海域浮游植物生长,进而导致莱州湾近岸海域Chl a浓度增加并有可能使该区域的富营养化程度增加。
Based on a survey of Chl a and related environmental parameters in the surface waters of the Laizhou Bay rivers and adjacent waters at the end of September 2012, the distribution, influencing factors, eutrophication status and trends of Chl a in this area were analyzed. The average concentration of Chla in rivers along the Laizhou Bay was 51.9 μg / L and in the adjacent waters was 3.9 μg / L. In coastal rivers, only SPM was positively correlated with Chl a, while SPM, PO4-P, NH4-N and NO3-N were positively correlated with Chl a in the adjacent waters. Nitrogen and phosphorus are the limiting factors for the Chl a in the coastal waters of the Laizhou Bay, of which the limiting effect of nitrogen is larger. The eutrophication of rivers in Laizhou Bay is mainly characterized by over-eutrophication and eutrophication of waters in coastal waters mainly by low eutrophication. The incorporation of high levels of nitrogen and phosphorus into coastal rivers will promote the growth of phytoplankton in the coastal waters of the Laizhou Bay and further increase the concentration of Chla in the coastal waters of the Laizhou Bay and may increase the eutrophication of the area.