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珠江口海域沉积物-水界面营养盐释放特征研究    

Release Characteristics of Nutrients at the Sediment-Water Interface of the Pearl River Estuary

文献类型:期刊文献

中文题名:珠江口海域沉积物-水界面营养盐释放特征研究

英文题名:Release Characteristics of Nutrients at the Sediment-Water Interface of the Pearl River Estuary

作者:施玉珍[1];陈树鸿[1];赵辉[1,2];张际标[1];段美娜[1];林佳赐[1]

机构:[1]广东海洋大学化学与环境学院,广东湛江524088;[2]南方海洋科学与工程广东省实验室,广东湛江524088

年份:2020

卷号:39

期号:3

起止页码:517

中文期刊名:矿物岩石地球化学通报

外文期刊名:Bulletin of Mineralogy, Petrology and Geochemistry

收录:CSTPCD、、北大核心2017、Scopus、CSCD2019_2020、北大核心、CSCD

基金:南方海洋科学与工程广东省实验室(湛江)开放项目(ZJW-2019-08);深圳市规划和国土资源委员会海域使用金资助项目(SZCG2013040968);广东海洋大学大学生创新创业训练计划项目(CXXL2017091,CXXL2019287)。

语种:中文

中文关键词:珠江口;沉积物-水界面;营养盐;交换速率

外文关键词:Pearl River estuary;sediment-water interface;nutrients;exchange rate

中文摘要:在2015年春季(3月),采用实验室培养法对珠江口海域5个站位的沉积物样品进行了沉积物-水界面营养盐交换速率的实验。结果显示,河口区交换速率较大,海湾地区交换速率较小。NH+4、NO-3、PO4^3-由沉积物向水体释放,NO-2由水体向沉积物迁移,交换速率均值分别为90.6μmol·d^-1·m^-2、106.9μmol·d^-1·m^-2、13.8μmol·d^-1·m^-2和-21.9μmol·d^-1·m^-2。NH+4、NO-3和NO-2在水体贫氧环境下的交换速率高于富氧条件下的交换速率,贫氧条件下沉积物是PO4^3-的释放源,富氧条件下沉积物是PO4^3-的汇。扰动条件下NH+4和PO4^3-的交换速率都大于非扰动条件,但NO-3则相反。NO-3和NO-2的交换速率主要受沉积物-水界面浓度扩散影响,NH+4和PO4^3-更多的受界面吸附-解吸控制;在增氧和扰动条件下由于沉积环境由强还原性向氧化性剧变,对沉积物-海水界面营养盐的交换影响比较复杂。与国内近岸海区相比,珠江口沉积物-水界面营养盐的交换速率处于中等水平。

外文摘要:The exchange rates of nutrients at the sediment-water interface were studied based on the laboratory cultivation of sediment samples collected from 5 sampling stations in the Pearl River estuary in March 2015. The results indicated that the exchange rates of nutrients varied significantly with different sedimentary environments. In the estuary area, the exchange rates of nutrients were higher in the mixing area of saltwater and freshwater than in the self-enclosing bay areas. NH+4, NO-3 and PO4^3- were released from sediments into the overlying water phase with the average exchange rates of 90 μmol·d-1·m-2, 106.9 μmol·d-1·m-2 and 13.8 μmol·d-1·m-2, respectively, while NO-2 was transferred from the water phase into sedimentes with the average exchange rate of-21.9 μmol·d-1·m-2. The exchange rates of NH+4, NO-3 and NO-2 were higher in the anoxic environment than those in the oxygen-enriched environment. The water phase was a source of PO4^3- in the anoxic environment but a sink in the oxygen-enriched environment. The exchange rates of NH+4 and PO43- were higher when water was disturbed, but the exchange rate of NO-3 showed a reverse change. Comprehensive analyses implied that the exchange rates of NO-3 and NO-2 were affected mainly by the concentration diffusion at the sediment-water interface, and exchange rates of NH+4 and PO4^3- were controlled mostly by the adsorption-desorption process at the interface. Under the conditions of increasing oxygen and medium disturbance, exchanges of nutrients at the sediment and sea water interface were complex because of the sharp change of sedimentary environment from the strong reducing environment to the oxidizing environment. Compared with those of other coastal areas of China, the exchange rates of nutrients at the sediment-water interface of the Pearl River estuary are of the medium level.

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