摘要
本文针对大、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分布均匀且含量较低;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,除大窑湾夏季Ⅰ级水质的隶属度略高于Ⅱ级水质的隶属度外,其他海域Ⅰ级水质的隶属度在61%～97%之间,属于Ⅰ级水质.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 horizontal distributions and seasonal variations of nutrient salts (N, P, Si ) and Pb, Zn are investigated inside and outside Dayao and Xiaoyao bays in this paper. The present environmental factors including seawater quality, nutritive structure and nutritive level are assessed, respectively. In the seasons of 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 rise out off the mouths. In summer, contrary to the seasons of 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 the coasts are greater than those at the mouths. From both the investigated bays, the environmental qualities are generally worse inside the bay than outside the bay. In the investigated year, except that Dayao Bay's membership degree of level Ⅰis slightly higher than that of level Ⅱ in spring, the sea areas which membership degrees are between 61% and 91% are subject to level Ⅰ of seawater quality. The index of sea water nutrient level is smaller than or close to the index of level Ⅰ, which implies that the nutrient condition in these two bays is poor.
出处
《海洋湖沼通报》
CSCD
北大核心
2005年第1期20-28,共9页
Transactions of Oceanology and Limnology
关键词
夏季
水平分布
营养水平
冬春季节
冬季
大窑湾
北部
海域
营养盐
季节变化
Dayao Bay and Xiaoyao Bay
nutritious salts
Pb and Zn
spatial and temporal variations
comprehensive assessment
