期刊
ENVIRONMENTAL MONITORING AND ASSESSMENT
卷 164, 期 1-4, 页码 21-28出版社
SPRINGER
DOI: 10.1007/s10661-009-0871-3
关键词
Alpine wetlands; GHG flux; Diurnal variation; Methane emission
资金
- Chinese Academy of Sciences [KSCX1-07, KSCX2-01-09, KZCX2-YW-418, KZCX2-XB2-02]
- Chinese Science & Technology Ministry [2006BAC01A15]
- National Natural Foundation of China [40671181, 90511008]
- Sichuan Science & Technology Bureau [03ZQ026-043]
Alpine wetland is a source for CH(4), 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 CH(4) m (-aEuro parts per thousand 2) h (-aEuro parts per thousand 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). CH(4) 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 CH(4) 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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