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| Methane emission characteristics of active layer in wetland permafrost area of the Tibetan Plateau |
| ZHANG Fu-Gui1, 2, ZHANG Shun-Yao1, 2, 3, TANG Rui-Ling1, WANG Hui-Yan1, 2, YANG Zhi-Bin1, 2, ZHOU Ya-Long1, 2, SUN Zhong-Jun1, 2 |
1. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China;
2. Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China;
3. Chengdu University of Technology, Chengdu 610000, China |
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Abstract As an important part of the earth’s terrestrial carbon cycle, the Tibetan Plateau has become a hot place of warmhouse gas emission. The effect of gas hydrate exploration on ecological environment deserves much attention. In this paper, the authors studied the flux and isotope of subsurface methane in gas hydrate area of the Qilian Mountain. Some conclusions have been reached: 1. Methane emission from alpine steppe and alpine meadow shows seasonal features. The maximum emission value is 19.2 mg/m2·h and the maximum absorption value is -108 mg/m2·h, demonstrating the role of carbon sink. 2. Methane isotope data show that there exist a large number of microorganisms in the active layer of permafrost region. The methane in 10~30cm is the cause of microorganism, which is relatively active in summer and inactive in winner. The metabolic process of microorganism changes the oxidation-reduction of methane, and bacteria addicted to methane leads to the emission of methane. 3. As for the occurrence state of gas hydrate and the way of exploration, the phenomenon of blast increase of methane in near-surface atmosphere does not appear. 4. The emission of methane is influenced by many factors, and hence the study of temperature, moisture and PH value of soil needs further research.
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Received: 08 September 2017
Published: 20 December 2017
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