福建三沙湾夏季海水溶解氧分布及低氧现象初探  

Preliminary Studies on DO Distributions and Hypoxia of Sansha Bay of Fujian in Summer

作　　者：王颢[1] 魏姗姗[1] 阳藻 张婕[3] 王爱军[4] 

机构地区：[1]福建省海洋环境与渔业资源监测中心,福建福州350003 [2]宁德市海洋与渔业环境监测站,福建宁德352100 [3]国家海洋局第三海洋研究所,福建厦门361005 [4]国家海洋标准计量中心,天津300112

出　　处：《海洋湖沼通报》2014年第3期167-174,共8页Transactions of Oceanology and Limnology

基　　金：国家海洋公益性行业科研专项经费项目(200805065)资助

摘　　要：通过2011年对福建三沙湾的水环境质量调查,结合历史资料对海水溶解氧含量和表观耗氧量（AOU）的分布变化情况进行了分析,并对造成低氧的原因进行了探讨。结果表明：三沙湾在8月存在整体性的低氧现象,除东安岛附近的广大海域溶解氧含量均低于5.00mg/L,其中部分海域溶解氧含量仅有4.22～4.23mg/L,导致湾内养殖区部分贝类出现死亡。AOU在河口及养殖区均较高,达2.50mg/L以上。湾内两个典型断面溶解氧垂直分布中,以养殖区为主的西向断面低氧程度较以航道区为主的北向断面严重。溶解氧月际变化分析表明低氧状况发生在夏季,即于6月开始9月结束,年际变化分析表明低氧现象自本世纪开始出现,近年来有所加剧。出现低氧现象的原因与湾内大规模的网箱养殖关系非常密切,此外由于三沙湾初级生产力低,产氧能力弱,使其较其他海湾更容易出现低氧现象。Based on survey carried out in Sansha Bay in 2011,compared with historical data,the distributions and changes of dissolved oxygen（DO）,and apparent oxygen utilization（AOU） were analyzed.The results indicated that almost entire Sansha Bay was in the status of hypoxia in August,DO was below 5.OOmg/L in the vast sea area except Dong-an island.In part of area DO was only between 4.22-4.23mg/L,causing death to some shellfish in aquaculture areas.AOU in estuaries and aquaculture areas were relatively high,usually above 2.50 mg/L.Hypoxia in westward aquaculture-based section was more serious than northward navigation-based section.Monthly changes of DO showed that hypoxia occurred in summer,usually from June to September.Inter-annual changes of DO showed that Hypoxia occurred in the beginning of this century and intensified in recent years.Hypoxia was closely related to the massive cage-culture activities.In addition,due to the low level of primary productivity,oxygen productivity was limited,causing hypoxia more easily than other bay in Fujian coast.

关 键 词：夏季 三沙湾 溶解氧 分布 低氧现象 

分 类 号：P734.2[天文地球—海洋化学]