广西北海珍珠养殖海域水体自净能力的表现特点

Self-purification characteristics of pearl-cultivating sea waters of Beihai,Guangxi

根据2008年9月和2009年4月的调查资料,首次对北海珍珠养殖海域的水体自净能力进行分析探讨。结果表明:该海区不仅具有较强的水体自净能力,而且显示了贝类养殖海区特有的水体自净特点。其中物理自净能力是以潮海流的水动力影响为主,而海区优越的地理位置也为污染物的迁移扩散提供了极为有利的条件;较强的化学净化能力主要体现在作为水体氧化剂的溶解氧较高的含量水平上以及作为表征水体有机污染程度高低的总有机碳较低的含量水平上,同时也体现在作为有机物氧化产物的氮磷循环特征上;生物自净能力则主要从该海区生化过程的表现形式、海洋食物链的传递作用以及适宜的现存浮游植物生物量和初级生产力水平显示出来。

According to the investigation data obtained in Sep. 2008 and Apr. 2009, the research for the first time on the self-purification characteristics of pearl-cultivating sea waters of Beihai, Guanxi Province was made. The result showed that the waters in this area not only had the stronger self-purification capability, but also the unique self-purlfication characteristics in the shellfish cultivating water bodies. The physical self-purification capability was achieved from the tide water power, and the preferred geographic location pro vides the most favorable conditions for the pollutants to be transferred and diffused. A stronger chemical self-purification capability was represented by a higher level of dissolved oxygen content--the oxidizing agent in the water body, by the lower levels of total organic carbon content--an indicator of the degree of the organic pollution, and at the same time, by the nitrogen phosphorus circulation, which was the product of organic oxidation. The Biological self-purification capability was represented by the form of the biochemical process in the sea, by the transferring effect of the marine food ehain, and by the biomass and the primary productivity level of the existing phytoplankton suitable in the water.