北海湾生态环境特征及其营养状况分析

AN ANALYSIS OF THE ENVIRONMENTAL CHARACTERISTICS AND NUTRIENT STATUS OF BEIHAI BAY

根据 1 998年 1 0月～ 1 999年 8月四个季度月对北海湾的调查资料 ,分析研究了该湾的生态环境特征及其营养水平。结果表明 :该湾的基本环境参数 (水温、盐度、pH、DO、SS)均有利于亚热带各种海洋生物的繁殖和生长 ;DIP具有低磷特征 ,但DIN在春夏季节显得过剩 ,秋冬季节显得紧缺 ;Chl a含量居中 ,但COD在春夏秋季节均出现超标现象 ,尤以夏季为甚。NQI和A的分析结果显示 ,该湾的富营养水平及污染程度均以春季较为严重 ,夏季次之 ,秋冬季水质状况较好 ;南流江较大的迳流量及沿岸工业排废、生活排污是导致该湾富营养化形成及污染程度加重的主要原因 。

Based on the seasonal observations from Oct. 1998 to Aug. 1999, we made on analysis of the characteristics of the eco environment of the bay and its nutrient level. The results show that all of the basic parameters in this bay (temperature, salinity, pH, DO, SS) are suitable for the breeding and growth for all kinds of living beings in subtropical oceans. The DIP in this bay maves a feature of low phosphor content. DIN appears over abundant in spring and summer and is rather short in autumn and winter. The CHL A content is medial. The COD content is not up to the standard in spring , summer and autumn, especially in summer. An analysis of NQI and A shows that, both the eutrophication level and the pollution degree are relatively severe in spring, slightly better in summer, and better in autumn and winter. The relatively great runoff flow of the NanLiu River, the industrial and city waste water are the dominant cause of increasing pollution degree and eutrophication. DIN and COD are the main factors.