Environmental Pollution, Oct, 2011, Vol.159(10), p.2467(9)
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.envpol.2011.06.025 Byline: Xing Wu (a)(b), Nicolas Bruggemann (c), Rainer Gasche (a), Hans Papen (a), Georg Willibald (a), Klaus Butterbach-Bahl (a) Abstract: Based on multi-year measurements of CH.sub.4 exchange in sub-daily resolution we show that clear-cutting of a forest in Southern Germany increased soil temperature and moisture and decreased CH.sub.4 uptake. CH.sub.4 uptake in the first year after clear-cutting (-4.5 [+ or -] 0.2 [mu]g C m.sup.-2 h.sup.-1) was three times lower than during the pre-harvest period (-14.2 [+ or -] 1.3 [mu]g C m.sup.-2 h.sup.-1). In contrast, selective cutting did not significantly reduce CH.sub.4 uptake. Annual mean uptake rates were -1.18 kg C ha.sup.-1 yr.sup.-1 (spruce control), -1.16 kg C ha.sup.-1 yr.sup.-1 (selective cut site) and -0.44 kg C ha.sup.-1 yr.sup.-1 (clear-cut site), respectively. Substantial seasonal and inter-annual variations in CH.sub.4 fluxes were observed as a result of significant variability of weather conditions, demonstrating the need for long-term measurements. Our findings imply that a stepwise selective cutting instead of clear-cutting may contribute to mitigating global warming by maintaining a high CH.sub.4 uptake capacity of the soil. Author Affiliation: (a) Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Kreuzeckbahnstrasse 19, Garmisch-Partenkirchen, Germany (b) State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, 100085 Beijing, China (c) Forschungszentrum Julich GmbH, Agrosphere Institute (IBG-3), Leo-Brandt-Strasse, 52425 Julich, Germany Article History: Received 14 February 2011; Revised 10 June 2011; Accepted 19 June 2011
Weather ; Global Warming ; Methane
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