Diurnal variation of methane emissions from an alpine wetland on the eastern edge of Qinghai-Tibetan Plateau.
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(-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). 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.
Chen
Huai
H
College of Resources and Environment Science, Chongqing University, Chongqing, 400030, China. chenhuai81@gmail.com
Wu
Ning
N
Yao
Shouping
S
Gao
Yongheng
Y
Wang
Yanfen
Y
Tian
Jianqing
J
Yuan
Xingzhong
X
D000393:Air Pollutants / Q000032:analysis*; D002940:Circadian Rhythm; D008697:Methane / Q000032:analysis*; D018609:Tibet; D053833:Wetlands
D000393:Air Pollutants; D008697:Methane