宁德海域表层沉积物氧化还原环境特征及其影响因素

发布时间：2018-03-01 11:52

本文关键词： 宁德海域表层沉积物氧化还原电位影响因素　出处：《海洋环境科学》2016年06期 　论文类型：期刊论文

【摘要】：通过2015年8月对宁德海域表层沉积物氧化还原电位(Eh)的现场调查(119.867°E~120.649°E,26.348°N~26.994°N),分析了该海域表层沉积物Eh的分布特征,并从水团性质、盐度、p H、溶解氧等上覆水体特征参数以及硫化物、有机质、底质类型等沉积物特征因子两大方面探讨了Eh的影响因素。结果表明,研究海域表层沉积物Eh的变化范围为-162~110 m V,平均值为-89 m V,基本属于弱还原性-还原性环境,空间分布呈近岸高外海低的特征。相较于20世纪80年代福建沿岸Eh调查结果,本次调查宁德近海表层沉积物Eh明显降低。上覆水体的盐度、DO等参数与Eh表现出一定的相关性,DO与Eh的正相关性极为显著(r=0.729,p0.01),且空间分布特征也较为相似。表层沉积物中硫化物含量高低直接影响Eh值,并表现出极显著的负相关(r=-0.806,p=0.000)。近年来,受人类活动影响,研究海域表层沉积物氧化还原状态发生了明显改变,这种改变在一定程度上会影响沉积物中生物的生存活动,因此有必要采取相应措施,加强该海域底质环境的监测,在保持地区经济发展的同时也要加强海域环境的保护力度。
[Abstract]:Based on the field investigation of surface sediment redox potential (Eh) in Ningde sea area in August 2015, the distribution characteristics of Eh in surface sediments of Ningde sea area were analyzed by means of 119.867 掳E ~ (120) 掳E ~ (120), 649 掳E ~ (12) 掳E ~ (2 +) and 26.348 掳N ~ (26.94) 掳N ~ (26) N ~ (-1). The characteristics of overlying water bodies such as water mass, salinity, dissolved oxygen and sulfides were analyzed. The influence factors of Eh are discussed in two aspects, such as organic matter, sediment type and so on. The results show that the variation range of Eh in the surface sediments of the studied sea area is -162U 110mV, the average value is -89mV, which basically belongs to the weakly reduction-reductive environment. The spatial distribution shows the characteristics of high and low inshore, comparing with the results of Eh survey along Fujian coast in 1980s. In this investigation, the Eh of the surface sediments in Ningde coastal waters decreased obviously. The parameters such as salinity, do and Eh in the overlying water showed a certain correlation with Eh. The positive correlation between do and Eh was extremely significant, and the spatial distribution of Eh was similar to that of the overlying water. The sulphide content in the product directly affects the Eh value. In recent years, under the influence of human activities, the redox state of surface sediments in the study area has changed obviously, and this change will affect the survival of organisms in sediments to some extent. Therefore, it is necessary to take corresponding measures to strengthen the monitoring of the sediment environment in the sea area, and to strengthen the protection of the sea area environment while maintaining the regional economic development.
【作者单位】：国家海洋局第二海洋研究所工程海洋学重点实验室;国家海洋局第二海洋研究所;
【基金】：浙江省自然科学基金资助项目(LY15D060004) 国家自然科学基金资助项目(41376194)
【分类号】：X55

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