The influence of plants on atmospheric methane in an agriculture-dominated landscape
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The primary objective of this study was to clarify the influence of crop plants on atmospheric methane (CH4) in an agriculture-dominated landscape in the Upper Midwest of the United States. Measurements were carried out at two contrasting scales. At the plant scale, CH4 fluxes from soybean and corn plants were measured with a laser-based plant chamber system. At the landscape scale, the land surface flux was estimated with a modified Bowen ratio technique using measurements made on a tall tower. The chamber data revealed a diurnal pattern for the plant CH4 flux: it was positive (an emission rate of 0.4 ± 0.1 nmol m−2 s−1, average of soybean and corn, in reference to the unit ground area) during the day, and negative (an uptake rate of −0.8 ± 0.8 nmol m−2 s−1) during the night. At the landscape scale, the flux was estimated to be 14.8 nmol m−2 s−1 at night and highly uncertain during the day, but the available references and the flux estimates from the equilibrium methods suggested that the CH4 flux during the entire observation period was similar to the estimated nighttime flux. Thus, soybean and corn plants have a negligible role in the landscape-scale CH4 budget.
KeywordsMethane Corn Soybean Agriculture Land surface flux Footprint analysis
We would like to thank the University of Minnesota UMore Park for use of the facilities. Funding was provided by the Ministry of Education of China (grant PCSIRT), the Rice Family Foundation, the Yale Institute for Biospheric Studies, and USDA NIFA/2010-65112-20528.
- Bavin TK, Griffis TJ, Baker JM, Venterea RT (2009) Impact of reduced tillage and cover cropping on the greenhouse gas budget of amaize/soybean rotation ecosystem. Agric Ecosyst Environ 134:234–242Google Scholar
- Dueck TA, de Visser R, Poorter H, Persijn S, Gorissen A, de Visser W, Schapendonk A, Verhagen J, Snel J, Harren FJM, Ngai AKY, Verstappen F, Bouwmeester H, Voesenek L, van der Werf A (2007) No evidence for substantial aerobic methane emission by terrestrial plants: a C-13-labelling approach. New Phytol 175:29–35CrossRefGoogle Scholar
- Jacinthe PA, Lal R (2003) Nitrogen fertilization of wheat residue affecting nitrous oxide and methane emission from a central Ohio Luvisol. Biol Fertil Soils 37:338–347Google Scholar
- Logan JA, Prather MJ, Wofsy JC, McElroy MB (1981) Tropospheric chemistry: a global perspective. J Geophys Res 86:7210–7254Google Scholar
- Long KD, Flanagan LB, Cai T (2010) Diurnal and seasonal variation in methane emissions in a northern Canadian peatland measured by eddy covariance. Glob Chang Biol 16:2420–2435Google Scholar
- United States Department of Agriculture (2009) US Summary and State Data 2007 Census. Rep Agric 1:7–16Google Scholar
- Zhang X (2013) Improving regional-scale greenhouse gas inventories in an agriculturedominated landscape using a multi-scale approach. PhD Dissertation, Yale UniversityGoogle Scholar