2008年罗源湾水体富营养化状况的初步研究

Preliminary Studies on the Eutrophication Status of Luoyuan Bay in 2008

本文根据2008年罗源湾2、5、8、11月COD、无机氮和无机磷的调查数据,结合历史数据对罗源湾水体富营养化进行分析和评价。结果表明:罗源湾海域四个季节均处于富营养化状态。富营养化程度夏季最低,秋季最高。各营养要素对富营养化状态指数的贡献中以CODMn所占的比重最大,其次为无机氮。富营养化分级评价表明该海域水体营养等级为中度营养级。除秋季外的三个季节均存在氮限制。通过对近10年来的数据进行分析,发现罗源湾富营养化程度逐年加重,目前已接近严重富营养化。各营养要素中CODMn对富营养化状态指数的贡献正在减少,而磷酸盐的贡献则有所增加。

Based on the survey carried in Luoyuan Bay in Feburary, May, August and November in 2008, eutrophication status was studied and analyzed. Results showed that eutrophication which existed in all the year round appeared lowest in slimmer and highest in autumn. CODMn made the primary contribution to the eutrophication index （EI）, while the contribution of DIN was secondarily. N limitation existed in all the season except autumn. According to the studies among historical data in the past 10 years, we found that the degree of eutrophication was deepening than ever before. Among the factors that contribute to the EI, the role of CODMn was fading away, while the role of phosphate showed the opposite trend.