35SO42-示踪法测定九龙江河口沉积中硫酸盐还原速率

尹希杰; 孙治雷; 徐勇航; 李云海; 邵长伟

doi:10.3969/j.issn.0253-4193.2015.04.008

³⁵SO₄^2-示踪法测定九龙江河口沉积中硫酸盐还原速率

doi: 10.3969/j.issn.0253-4193.2015.04.008

1.
国家海洋局第三海洋研究所海洋与海岸地质环境开放实验室, 福建厦门 361005
2.
青岛海洋地质研究所国土资源部海洋油气资源和环境地质重点实验室, 山东青岛 266071
3.
山东省物化探勘查院, 山东济南 250013

基金项目: 国家青年基金(41006072,41276059);福建省青年基金项目(2010J05095).

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出版历程
- 收稿日期: 2014-03-31
- 修回日期: 2014-09-23

Measurement of sulfate reduction rate in coastal sediments of Jiulong River Estuary with a radiotracer technique

1.
Open Laboratory of Ocean & Coast Environmenttal Geology, Third Institute of Oceanography State Oceanic Administration, Xiamen 361005, China
2.
Key Laboratory of Ministry of Land and Resources for Marine Oil Gas Resources and Environmental Geology, Qingdao Institute of Marine Geology, Qingdao 266071, China
3.
Shandong Geophysical and Geochemical Exploration Institute, Jinan 250013, China

摘要

摘要: 在2011年7月利用³⁵SO₄^2- 培养示踪法测定九龙江河口两个站位(A站位位于咸淡混合区,盐度3~5;B站位位于海相区,盐度20~25)沉积柱中硫酸盐还原速率的垂直分布.结果显示A站位沉积柱中硫酸盐还原速率变化范围为54~2 345 nmol/(cm³·d),从表层到底部先增大后减小,最大值出现在20 cm深度附近;B站位硫酸盐还原速率在 24~987 nmol /(cm³·d)之间,分别在10 cm和78 cm深度附近出现两个峰值,分别为876和987 nmol/(cm³·d).综合分析两个站位孔隙水中SO₄^2-、甲烷浓度和沉积物中总有机碳、温度和氧化还原电位的垂直变化趋势与其硫酸盐还原速率的分布规律,表明A站位沉积物中硫酸盐还原以有机矿化为主;B站位受到有机质矿化和甲烷厌氧氧化的共同作用;两个站位硫酸盐还原速率及垂直分布趋势受孔隙水中SO₄^2-浓度、有机质活性和温度的共同影响;根据各个层位硫酸盐还原速率估算两个站位硫酸盐还原通量(以硫计)分别为527.9和357.1 mmol/(m²·d),表明硫酸盐还原是九龙江河口有机质厌氧矿化的重要路径.
- 硫酸盐还原速率 /
- 硫酸根(SO₄^2-) /
- 甲烷厌氧氧化 /
- 九龙江河口
Abstract: Sulfate reduction rates were measured experimentally with ³⁵SO₄^2- in sediment of A and B cores in coastal of Jiulong River Estuary in July of 2011. A and B cores were situated in the upper estuarine coast and seaward boundary respectively,with low salinity (3-5) and high salinity (20-25). Sulfate reduction rates volume-based values ranged from 54 to 2 345 nmol/(cm³·d) in vertical profile of A core,and the highest sulfate reduction rates occurred at 20 cm depth. Sulfate reduction rates varied from 24 to 987 nmol/(cm³·d) in B core,two peaks in sulfate reduction rates profiles obviously appeared on the top 10 cm and at 78cm depth,with significantly high value of 876 nmol/(cm³·d) and 987 nmol/(cm³·d),respectively. Based on trends on the vertical profile of SO₄^2-,methane concentration in pore water and total organic carbon,temperature and oxidation reduction potential in sediments of two cores,sulfate reduction is mainly dominated by organic mineralization in A Core,however sulfate reduction is controlled by the combination of organic matter mineralization and anaerobic methane oxidation in B Core. Meanwhile sulfate reduction rates and the vertical distribution trends of it were affected by the availability of active organic matter,temperature and SO₄^2- concentration in the pore water in two cores. The depth-integrated sulfate reduction rates were 527.9 mmol/(m²·d) and 357.1 mmol/(m²·d) within sulfate reduction zone in A Core and B Core respectively. Sulfate reduction is one of the major processes contributing to the mineralization of organic matter in this estuary.
- sulfate reduction rate /
- sulfate /
- anaerobic methane oxidation /
- Jiulong River Estuary

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