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Diurnal variation of methane emissions from an alpine wetland on the eastern edge of Qinghai-Tibetan Plateau |
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| Authors: | Huai Chen Ning Wu Shouping Yao Yongheng Gao Yanfen Wang Jianqing Tian Xingzhong Yuan |
| Institution: | 1. College of Resources and Environment Science, Chongqing University, Chongqing, 400030, China 2. Key Laboratory for the Exploitation of South-West Resources and Environmental Disaster Control Engineering, Ministry of Education, Chongqing, 400030, China 3. Graduate School of Chinese Academy of Sciences, Beijing, 100049, China 4. Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China 5. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China |
| Abstract: | Alpine wetland is a source for CH4, but little is known about methane emission from such wetland, especially about its diurnal pattern. In this study we tried to probe the diurnal variation in methane emission from alpine wetland vegetation. The average methane emission rate was 9.6 ± 3.4 mg CH4 m???2 h???1. There was an apparent diurnal variation pattern in methane emission with one minor peak at 06:00 and a major one at 15:00. The sunrise peak was consistent with a two-way transport mechanism for plants (convective at daytime and diffusive at night-time). CH4 emission was found significantly correlated with redox potentials. The afternoon peak could not be explained by diurnal variation in soil temperature, but could be attributable to changes in CH4 oxidation and production driven by plant gas transport mechanism. The results have important implications for sampling and scaling strategies for estimating methane emission from alpine wetlands. |
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