Methane Uptake by Soils of a Temperate Deciduous Forest
Guckland, A., Flessa, H. and Prenzel, J. 2009. Controls of temporal and spatial variability of methane uptake in soils of a temperate deciduous forest with different abundance of European beech (Fagus sylvatica L.). Soil Biology & Biochemistry 41: 1659-1667.
Guckland et al. report that "the variation of CH4 uptake over time could be explained to a large extent by changes in soil moisture in the upper five centimeters of the mineral soil," such that "the CH4 uptake during the main growing period (May-September) increased considerably with decreasing precipitation rate," which finding, as they describe it, is "in accordance with the general observation that soil moisture is the primary environmental control on CH4 uptake in soils because it regulates methane flux into the soil through diffusion (Smith et al., 2000; Butterbach-Bahl and Papen, 2002; Borken et al., 2006)." They also report that the methane flux response to soil moisture content was linear, as has been found to be the case in still other studies (Dobbie and Smith, 1996; Bradford et al., 2001; Price et al., 2003). In addition, they observed that "low CH4 uptake activity during winter was further reduced by periods with soil frost and snow cover."
"The results suggest," in the words of the three researchers, "that climate change [in this case, global warming] will result in increasing CH4 uptake rates in this region because of the trend to drier summers and warmer winters." And this response represents a negative feedback that should help to temper predicted increases in CO2-induced global warming.
Borken, W., Davidson, E.A., Savage, K., Sundquist, E.T. and Steudler, P. 2006. Effect of summer throughfall exclusion, summer drought, and winter snow cover on methane fluxes in a temperate forest soil. Soil Biology & Biochemistry 38: 1388-1395.
Bradford, M.A., Ineson, P., Wookey, P.A. and Lappin-Scott, H.M. 2001. Role of CH4 oxidation, production and transport in forest soil CH4 flux. Soil Biology & Biochemistry 33: 1625-1631.
Butterbach-Bahl, K. and Papen, H. 2002. Four years continuous record of CH4-exchange between the atmosphere and untreated and limed soil of an N-saturated spruce and beech forest ecosystem in Germany. Plant and Soil 240: 77-90.
Dobbie, K.E. and Smith, K.A. 1996. Comparison of CH4 oxidation rates in woodland, arable and set aside soils. Soil Biology & Biochemistry 28: 1357-1365.
Price, S.J., Sherlock, R.R., Kelliher, F.M., McSeveny, T.M., Tate, K.R. and Condron, L.M. 2003. Pristine New Zealand forest soil is a strong methane sink. Global Change Biology 10: 16-26.
Smith, K.A., Dobbie, K.E., Ball, B.C., Bakken, L.R., Sitaula, B.K., Hansen, S., Brumme, R., Borken, W., Christensen, S., Prieme, A., Fowler, D., MacDonald, J.A., Skiba, U., Klemedtsson, L., Kasimir-Klemedtsson, A., Degorrska, A. and Orlanski, P. 2000. Oxidation of atmospheric methane in Northern European soils, comparison with other ecosystems, and uncertainties in the global terrestrial sink. Global Change Biology 6: 791-803.