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根据2010年8月的调查资料,分析了珠江口海域溶解氧的分布特征,探讨了其与水体稳定性、营养盐、叶绿素a及CO2分压的关系。结果表明,溶解氧浓度由珠江口内向口外近海逐渐递增,在垂向上则随着水深由浅至深呈下降趋势。相关性分析显示,溶解氧在表底层的浓度差与温度差、盐度差和叶绿素a含量差都达到显著相关的水平,低氧区的形成与水体层化和有机质的降解耗氧密切相关,其中珠江冲淡水为浮游植物的生长和繁殖提供了丰富的N、P营养盐,而浮游生物的消亡和有机质的分解加剧了氧的亏损。溶解氧海气通量呈现明显的空间差异,其中河口上游表现为氧汇,而下游海域为氧源。
According to the survey data in August 2010, the distribution characteristics of dissolved oxygen in the Pearl River estuary area were analyzed. The relationship between dissolved oxygen and water body stability, nutrients, chlorophyll a and partial pressure of CO2 were discussed. The results showed that the concentration of dissolved oxygen gradually increased from the Pearl River estuary to the outside of the estuary and vertically downward, with the water depth decreasing from shallow to deep in the vertical direction. Correlation analysis showed that there was a significant correlation between concentration difference and temperature difference, salinity difference and chlorophyll a content of dissolved oxygen in the bottom of table. The formation of hypoxic zone was closely related to stratification of water body and degradation of organic matter, Among them, the freshwater from the Pearl River provides rich N and P nutrients for the growth and reproduction of phytoplankton, and the extinction of plankton and the decomposition of organic matter aggravate the oxygen loss. The dissolved oxygen flux showed a significant spatial difference, with the upper reaches of the estuary manifested as oxygen sinks and the downstream waters as the oxygen source.