长江口外低氧区特征及其影响研究  

Characters of hypoxia area off the Yangtze River Estuary and its influence

作　　者：刘志国[1] 徐韧[1] 刘材材[1] 秦玉涛[1] 蔡芃[1] 

机构地区：[1]国家海洋局东海环境监测中心,上海200137

出　　处：《海洋通报》2012年第5期588-593,共6页Marine Science Bulletin

基　　金：国家"十一五"科技支撑计划项目(2008BAC42B03);海洋公益性行业科研专项(201205015-02);我国近海海洋综合调查与评价专项(SH-JC)

摘　　要：通过对2008年8月至2010年9月在长江口30°20′N-32°30′N,122°15′E-124°20′E范围海域开展的7次综合海洋调查资料进行分析,以期了解长江口海域低氧现象的年际、季节变化及其对海洋环境和生物的影响。研究结果发现,该海域夏季存在长江口和浙江南部两处低氧区域,低氧现象主要发生在20～50 m水层;低氧海域与非低氧海域的无机氮(DIN)、活性磷酸盐、叶绿素a含量存在一定差异;长江口海域浮游动物、浮游植物的分布状况与低氧区的存在与否未能发现相关关系。低氧区是底栖生物生物量的高值区,多毛类是其中最多的底栖生物种类,对低氧环境的耐受程度较高。To understand the characteristics of dissolved oxygen and its annual and seasonal changes, seven surveys were carried out from August 2008 to September 2010 in the Yangtze Estuary covering the area from 30°20′-32°30′N to 122° 15′-124°20′E. The results showed that, there co-existed two hypoxic zones in the survey area in summer. Hypoxia occurred mainly between 20m to 50 m water layers in summer. Dissolved inorganic nitrogen, active phosphate and Chlorophyll a had discrepancy between hypoxic zone and other areas, yet hypoxia affected planktons slightly. The hypoxia area was high distribution center of biomass. Polychaetes were the most species of benthic community, which had high tolerance to hypoxemia.

关 键 词：长江口 溶解氧 低氧区 分布特征 

分 类 号：X55[环境科学与工程—环境工程]