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根据2011年4月份的调查资料,分析了珠江口上游海域DO及其相关因子的分布特征,对DO与盐度、p H、COD、NH4-N等相关因子之间的关系进行了研究,对缺氧原因进行了探讨,同时对底层海水缺氧与表层沉积物中硫化物含量之间的关系进行了初步研究。结果表明,2011年春季珠江口在东江干流入海口到东莞江入海口之间海域的表、底层海水均处于缺氧状态,多数站点海水中DO含量低于3.5 mg/L;COD和NO3-N含量沿径流方向降低;NH4-N沿径流方向升高;DO与COD呈现显著负相关关系,与NH4-N呈现显著正相关关系,有机物耗氧作用明显;在东莞新沙城近岸、淡水河入海口和太平水道DO极低的海域,表层沉积物中硫化物的含量偏高。
According to the survey data in April 2011, the distribution characteristics of DO and its related factors in the upper reaches of the Pearl River Estuary were analyzed. The relationships between DO and related factors such as salinity, p H, COD and NH4-N were studied. The causes of hypoxia were discussed. At the same time, a preliminary study was carried out on the relationship between the underlying sea water anoxic and sulfide content in surface sediments. The results showed that in the spring of 2011, the surface of the Pearl River Estuary in the sea area between the estuary of the Dongjiang River and the estuary of Dongguan River was hypoxia, the DO content in most sites was less than 3.5 mg / L; the COD and NO3-N The content of NH4-N increased along the runoff direction; DO and COD showed a significant negative correlation, with NH4-N showed a significant positive correlation, the role of oxygen consumption of organic matter significantly; Haikou and Pacific waterways DO extremely low waters, the surface sediment sulfide content is high.