珠江口咸淡水交汇区营养盐的化学自净研究  

A STUDY ON CHEMICAL SELF-PURIFICATION OF NUTRIENTS IN THE MIXING REGION OF SALT AND FRESH WATER OF ZHUJIANG RIVER ESTUARY

作　　者：郑庆华[1] 何悦强 张银英[1] 温伟英[1] 张慕贞 梁雪仪 

机构地区：[1]中国科学院南海海洋研究所,香港浸会学院

出　　处：《热带海洋学报》1995年第2期68-75,共8页Journal of Tropical Oceanography

基　　金：国家自然科学基金;香港浸会学院合作项目

摘　　要：珠江口咸淡水交汇区是河流污染物质的集散地。为了揭示营养盐（氮、磷）在河口区复杂的化学自净过程，深入了解其微妙变化，首次用珠江口咸淡水交汇区采集的水和沉积物，在香港浸会学院进行自净试验，探索其自净过程和变化规律。ome conclusions can be drawn up on the basis of the experiment results:The contents of nitrogen and phosphorus in the water body decrease with the prolongation of time. NO3-N content decreases more rapidly in the water with lower salinity, but the salinity does not give obvious effect on the decrement of NO2-N, NH4-N and PO4-P contents, the transformation of nitrogen in rapid flowing water is faster than that in slow flowing water.The self-purification of nutrients (nitrogen and phosphorus) in water body takes place more rapidly on the first day, especially in the first six hours from the begining of the experiments, the most obvious self-purifications occur for NO3-N and PO4-P.Half decay time (D50%) of NO3-N, NO2-N and NH4-N are 0. 7-5.3, 1-8 and 1-3. 2 days, respectively, but it is rather longer for PO4-P, amounting to 5. 7-8. 2 days.90% decrement of their contents (D90% ) takes more than 12 days (except NH4-N).9.3% of the added inorganic phosphorus and 28.6% of added inorganic nitrogen are deposited, the sedimentation percentages of nitrogen and phosphorus are in proportion to the content of suspended matters but in reverse proportion to the content of organic matters.

关 键 词：珠江口 交汇区 营养盐 自净 

分 类 号：P734.2[天文地球—海洋化学]