珠江口淇澳岛湿地甲烷排放通量及日变化规律

尹希杰; 何拥军; 孙治雷; 邵长伟

doi:10.3724/SP.J.1140.2014.05039

珠江口淇澳岛湿地甲烷排放通量及日变化规律

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, 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, 青岛 266071;
3. 山东省物化探勘查院, 济南 250013

基金项目:

国家自然科学基金项目(41006072，41376077)；国家海洋局第三海洋研究所科研业务费专项资金项目(海三科2013019)

详细信息

作者简介:
尹希杰(1977-),男,副研究员,主要从事海洋生物地球化学研究,E-mail:yinxijie2003@163.com

中图分类号: P736.4
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出版历程
- 收稿日期: 2013-11-18
- 修回日期: 2014-01-10

METHANE FLUX AND DIURNAL VARIATION IN SUPRATIDAL FLAT OF QI'AO ISLAND, PEARL RIVER ESTUARY

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

摘要

摘要: 2009年8月份采用静态箱法对珠江口淇澳岛湿地甲烷通量日变化进行测定,结果表明甲烷排放通量在当日23:00和翌日早晨9:00出现两个高峰值,分别为40.07和50.99 mg·m^-2·h^-1;在当日17:00和翌日凌晨5:00出现两极小值,分别为1.13和1.57 mg·m^-2·h^-1,同步观测孔隙水中SO₄^2-、Cl^-浓度和沉积物表层温度和采样点潮位变化,发现湿地甲烷排放通量与孔隙水中SO₄^2-浓度和潮位存在显著负相关性,因此,潮汐所导致孔隙水中SO₄^2-浓度和上覆水深度改变,可能是控制珠江口淇澳岛潮间带湿地甲烷日排放通量变化的两个关键因素。同时计算采样点甲烷日排放净通量达到962.7 mg·m^-2·d^-1,表明夏季珠江口淇澳岛湿地是大气甲烷的源区。柱状沉积物孔隙水中甲烷浓度范围为0.52~5.18 mmol·dm^-3,其最大值出现在9 cm深度,同时测试沉积物中总有机碳(TOC)、温度、氧化还原电位和孔隙水中SO₄^2-的浓度,结果表明高的甲烷浓度主要是由于沉积物中高的TOC含量和孔隙水中低的SO₄^2-浓度所导致。
- 甲烷 /
- 日排放通量 /
- 静态箱式法 /
- 淇澳岛湿地
Abstract: The diurnal methane flux from the supratidal flat of Qi'ao Island, Pearl River estuary was measured at a 2h interval throughout the day (24h) based on static chamber during August, 2009. Two peak-values of CH₄ flux occurred in midnight (23:00) and the next morning (9:00), with the value as high as 40.07 mg·m^-2·h^-1 and 50.99 mg·m^-2·h^-1respectively, whereas two minimum occurred in the evening (17:00) and the dawn of the next morning (5:00), with the value as low as 1.13 mg·m^-2·h^-1 and 1.59 mg·m^-2·h^-1. The concentration of SO₄^2- of pore water and tidal level were simultaneous monitored, showing obviously negative correlation with the methane flux. Therefore, the tidal dynamics is the factor leading to the variations in chemical parameters of the sediment and tidal level is the key controlling factor in diurnal variations in methane flux at the supratidal flat. The diurnal mean net methane flux from sampling sites was 962.7 mg·m^-2·d^-1, suggesting that the tidal flat of the Qi'ao Island is an important methane contributor to the atmosphere in summer. Methane concentrations of pore water range from 0.52 to 5.18 mmol dm^-3 with the maximum value occurring in the sub-surface (depth 9 cm). Total organic carbon (TOC), temperature, redox potential of sediments and SO₄^2- of pore water were measured simultaneously. The results show that the high concentration of methane match well with the high TOC in the sediment and low SO₄^2- in the pore water.
- methane /
- diurnal methane flux /
- static chamber /
- the flat of Qi'ao

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