珠江口上游海域春季水体缺氧特征及相关因素  

The character of hypoxia and the correlating factors in the upper reach of the Pearl River Estuary during spring

作　　者：李秀芹[1,2] 卢楚谦[1] 蔡伟叙[1] 彭晓鹃[1] 余汉生[1] 

机构地区：[1]国家海洋局南海环境监测中心,广东广州510300 [2]中山大学海洋学院,广东广州510275

出　　处：《海洋环境科学》2014年第6期854-859,共6页Marine Environmental Science

基　　金：海洋公益性科研专项经费项目(201205015)

摘　　要：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。On the basis of the data obtained through the cruise carried out in the upper reach of the Pearl River Estuary in April 2011,the distribution character of DO（ dissolved oxygen） and correlating factors were analyzed and the relationship between DO and salinity,p H,COD（ chemical oxygen demand）,ammonia,and other environmental factors were studied,the oxygen consumption factors was discussed,and the relationship between the hypoxia and concentration of sulfide in the surface sediment was initially explored. The result showed that the surface and bottom water were in the state of hypoxia between the mouth of East River Mainstream and the mouth of Dongguan River,and the concentration of DO in water were less than 3. 5 mg / L at most sites. COD and NO3- N decreased downstream,while ammonia increased. The correlation between DO and COD was negative,while positive between DO and ammonia. Oxygen depletion by organic chemical oxygen consumption was evident. The concentration of sulfide in the surface sediment was much higher at the coastal water of Xinsha City in Dongguan,the mouth of Danshui River,and in the Taiping Waterway,where the concentration of DO at bottom was much lower.

关 键 词：珠江口 DO 缺氧 NH4-N COD 

分 类 号：P734[天文地球—海洋化学] P736[天文地球—海洋科学]