| WU Zijun,ZHOU Huaiyang,PENG Xiaotong,LI Jiangtao,CHEN Guangqian. 2014. Rates of bacterial sulfate reduction and their response to experimental temperature changes in coastal sediments of Qi’ao Island, Zhujiang River Estuary in China. Acta Oceanologica Sinica, 33(8):10－17 |
| Rates of bacterial sulfate reduction and their response to experimental temperature changes in coastal sediments of Qi’ao Island, Zhujiang River Estuary in China |
| Rates of bacterial sulfate reduction and their response to experimental temperature changes in coastal sediments of Qi’ao Island, Zhujiang River Estuary in China |
| Received:August 24, 2012 Revised:May 27, 2013 |
| DOI：10.1007/s13131-014-0458-x |
| Key words:sulfate reduction rate temperature-gradient incubations 35SO42-tracer Qi’ao Island |
| 中文关键词: sulfate reduction rate temperature-gradient incubations 35SO42-tracer Qi’ao Island |
| 基金项目:The National Natural Science Foundation of China under contract Nos 40803020 and 41176065. |
| Author Name | Affiliation | E-mail | | WU Zijun | State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China | wuzj@tongji.edu.cn | | ZHOU Huaiyang | State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China | | | PENG Xiaotong | State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China | | | LI Jiangtao | State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China | | | CHEN Guangqian | Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China | |
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| Abstract: |
| Subtropical sediment cores (QA09-1 and QA12-9) from the coastal zone of Qi'ao Island in the Zhujiang River Estuary were used to determine the rates of sulfate reduction and their response to experimental temperature changes. The depth distribution of the sulfate reduction rates was measured from whole-core incubations with radioactive tracer 35SO42-, and peaks of 181.19 nmol/(cm3·d) and 107.49 nmol/(cm3·d) were exhibited at stations QA09-1 and QA12-9, respectively. The profiles of the pore water methane and sulfate concentrations demonstrated that anaerobic oxidation of methane occurred in the study area, which resulted in an increase in the sulfate reduction rate at the base of the sulfate-reducing zone. Meanwhile, the sulfate concentration was not a major limiting factor for controlling the rates of sulfate reduction. In addition, the incubation of the sediment slurries in a block with a temperature gradient showed that the optimum temperature for the sulfate reduction reaction was 36℃. The Arrhenius plot was linear from the lowest temperature to the optimum temperature, and the activation energy was at the lower end of the range of previously reported values. The results suggested that the ambient temperature regime of marine environments probably selected for the microbial population with the best-suited physiology for the respective environment. |
| 中文摘要: |
| Subtropical sediment cores (QA09-1 and QA12-9) from the coastal zone of Qi'ao Island in the Zhujiang River Estuary were used to determine the rates of sulfate reduction and their response to experimental temperature changes. The depth distribution of the sulfate reduction rates was measured from whole-core incubations with radioactive tracer 35SO42-, and peaks of 181.19 nmol/(cm3·d) and 107.49 nmol/(cm3·d) were exhibited at stations QA09-1 and QA12-9, respectively. The profiles of the pore water methane and sulfate concentrations demonstrated that anaerobic oxidation of methane occurred in the study area, which resulted in an increase in the sulfate reduction rate at the base of the sulfate-reducing zone. Meanwhile, the sulfate concentration was not a major limiting factor for controlling the rates of sulfate reduction. In addition, the incubation of the sediment slurries in a block with a temperature gradient showed that the optimum temperature for the sulfate reduction reaction was 36℃. The Arrhenius plot was linear from the lowest temperature to the optimum temperature, and the activation energy was at the lower end of the range of previously reported values. The results suggested that the ambient temperature regime of marine environments probably selected for the microbial population with the best-suited physiology for the respective environment. |
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