摘要
针对大、小窑湾湾内外海域的营养盐和铅、锌的分布规律与季节变化进行了调查,并以海水水质、营养结构和营养水平方面评价了两个海域的环境质量状况。结果表明:冬春季节N、P、Si三种营养盐的水平分布均有从湾顶向湾口海域降低、再向湾外上升的趋势;夏季三种营养盐的湾顶含量大大增加,水平分布趋势则表现为由湾里向湾口方向减少。冬季Pb含量较低,且分布均匀;春季小窑湾沿岸已受到Pb的污染。大窑湾北部沿岸冬季Zn污染严重,春季两湾内外海域Zn分布较均匀。夏季Pb、Zn的污染严重,水平分布为从北部沿岸向湾口方向下降。两个湾内环境质量劣于湾外;调查年度中,夏季两湾水质除总无机氮不超标外,其他三项指标均超标,达到轻度或重度污染状态;冬春两季只有锌污染指数大于1,其他皆低于清洁指数,水质处于较清洁状态。大、小窑湾海域的海水营养水平指数小于或接近一级的阈值,处于贫营养状态。
The spatial and temporal variations of nutritious salts ( N, P, Si ) and Pb, Zn are investigated inside and outside Dayao and Xiaoyao bays in this paper. The present conditions of environment factors including quality of sea water, nutritive structure and nutritive level are evaluated, respectively. In winter and spring, the above-mentioned three nutritious element contents were found to decline from the northern coastal zone to the mouth in both the Bays, and then arise off the mouths. In summer, contrary to winter and spring, the concentrations of these salts show a reversed tendency. Considering the pollution state, Pb and Zn were investigated and the experimental results show that their concentrations near coast are greater than that at the mouth. From both of the investigated bays, the environmental qualities are worse inside bay than outside bay at large. In an investigated year, two bays are in polluted condition except that contents of DIN are under that of standard in summer. However, the polluting indexes are under 0.6 except Zn in winter and spring, and water quality is fine. The index of sea the water nutrient level is smaller than or close to the index of level 1, which means the nutrient condition in these two bays is in poor condition.
出处
《海洋通报》
CAS
CSCD
北大核心
2005年第3期22-28,共7页
Marine Science Bulletin
关键词
大、小窑湾海域
营养盐
铅锌
时空变化
Dayao Bay and Xiaoyao Bay
nutritious salts
Pb and Zn spatial and temporal variations
