Ecosystem and physiological controls over methane production in northern wetlands

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	Ecosystem and physiological controls over methane production in northern wetlands
	David W. Valentine ; Elisabeth A. Holland ; David S. Schimel
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH
	1994
卷号	99 期号:D1 页码:1563
关键词	Biosphere-atmosphere Interactions Geochemical Cycles North America
产权排序	David W. Valentine, Natural Resource Ecology Laboratory, Colorado State University, Boulder, Colorado; Elisabeth A. Holland, National Center for Atmospheric Research, Boulder, Colorado; David S. Schimel, Natural Resource Ecology Laboratory, Colorado State University, Fort Collins
英文摘要	Peat chemistry appears to exert primary control over methane production rates in the Canadian Northern Wetlands Study (NOWES) area. We determined laboratory methane production rate potentials in anaerobic slurries of samples collected from a transect of sites through the NOWES study area. We related methane production rates to indicators of resistance to microbial decay (peat C:N and lignin:N ratios) and experimentally manipulated substrate availability for methanogenesis using ethanol (EtOH) and plant litter. We also determined responses of methane production to pH and temperature. Methane production potentials declined along the gradient of sites from high rates in the coastal fens to low rates in the interior bogs and were generally highest in surface layers. Strong relationships between CH₄ production potentials and peat chemistry suggested that methanogenesis was limited by fermentation rates. Methane production at ambient pH responded strongly to substrate additions in the circumneutral fens with narrow lignin:N and C:N ratios (∂CH₄/∂EtOH = 0.9–2.3mg g⁻¹) and weakly in the acidic bogs with wide C:N and lignin:N ratios (∂CH₄/∂EtOH = −0.04–0.02 mg g⁻¹). Observed Q₁₀ values ranged from 1.7 to 4.7 and generally increased with increasing substrate availability, suggesting that fermentation rates were limiting. Titration experiments generally demonstrated inhibition of methanogenesis by low pH. Our results suggest that the low rates of methane emission observed in interior bogs during NOWES likely resulted from pH and substrate quality limitation of the fermentation step in methane production and thus reflect intrinsically low methane production potentials. Low methane emission rates observed during NOWES will likely be observed in other northern wetland regions with similar vegetation chemistry.
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/5687
专题	科研共享资源
推荐引用方式 GB/T 7714	David W. Valentine,Elisabeth A. Holland,David S. Schimel. Ecosystem and physiological controls over methane production in northern wetlands[J]. JOURNAL OF GEOPHYSICAL RESEARCH,1994,99(D1):1563.
APA	David W. Valentine,Elisabeth A. Holland,&David S. Schimel.(1994).Ecosystem and physiological controls over methane production in northern wetlands.JOURNAL OF GEOPHYSICAL RESEARCH,99(D1),1563.
MLA	David W. Valentine,et al."Ecosystem and physiological controls over methane production in northern wetlands".JOURNAL OF GEOPHYSICAL RESEARCH 99.D1(1994):1563.

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