马鞍列岛保护区海域水环境质量分区评价

根据2012~2013年马鞍列岛保护区丰水期、平水期、枯水期3季的水质监测结果,利用富营养化指数(E)、营养状态质量指数(NQI)、有机污染指数(A),对水质富营养化程度和有机污染状况进行了分析。结果表明:水质COD、DO含量符合第一类水质标准,DIP含量基本符合第二类水质标准,而DIN含量超标严重;在丰、平两水期,各评价因子含量差异性比较明显,而枯水期则基本接近。该海域富营养化和有机污染较严重,不同季节均呈现富营养化,有机污染在平、枯两水期为中度污染状态,而丰水期则为严重污染状态,污染程度均为丰水期 枯水期 平水期;从分区上看,B、C、D 3个功能分区所处的中西部海域水质富营养化和有机污染最严重,A区(石斑鱼资源保护区)所处的北部海域居中,而E区(生态养殖区)所处的东南部海域相对最轻。

Partition assessment of water environment quality of Ma'an Archipelago

according to the water quality monitoring results of three seasons(rainy season、average water season and dry season) in Ma'an Archipelago area in 2012~2013, we analyse the degree of water quality eutrophication and organic pollution by using eutrophication index (E), quality of nutrition state index (NQI) and organic pollution index (A). The results show that: the content of COD and DO meet the first category of water quality standards, the content of DIP basically meets the second category of water quality standards, while the content of DIN exceeds the standards seriously. In rainy and average water season, the difference of each evaluation content is obvious, while in dry season is nearly close. Eutrophication and organic pollution are serious, different seasons turn out to be eutrophic, organic pollution is in moderate state in average water season and dry season, while it is heavily polluted in rainy season, that is rainy season average water season dry season. Look from the partition, water eutrophication and organic pollution in the midwest are the most serious in functional B、C、D partitions, north coastal water in A partition (grouper resource reserve) is in moderate pollution state, while the southeast coastal water in E partition(ecological culture zone) is the lightest.