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Soil Biology & Biochemistry

Methane Oxidation in Forest, Successional, and No-till Agricultural Ecosystems

Effects of Nitrogen and Soil Disturbance

^a Dep. of Crop and Soil Sciences and W.K. Kellogg Biological Station, Michigan State Univ., Hickory Corners, MI 49060
^b School of Biology, Institute of Science, Suranaree Univ. of Technology, Amphur Maung, Nakhonratchasima 30000, Thailand

^* Corresponding author (Robertson{at}kbs.msu.edu)

Methane oxidation in well-aerated soils is a significant global sink for atmospheric methane. We examined the effects of soil disturbance (simulated tillage) and N-fertilizer additions on methane oxidation in old-growth forest, mid-successional, and no-till maize ecosystems in southwest Michigan, USA. We found highest oxidation rates in forest sites (about 30 µg CH₄–C m^–2 h^–1 on average), with average rates in successional and agricultural sites about 75 and 12% of this, respectively. In the forest and successional sites a one-time N-fertilizer addition (100 kg NH₄NO₃–N ha^–1) significantly suppressed oxidation for the several weeks that inorganic N pools were elevated. There was no effect of fertilizer addition in the agricultural site, where available N was already high and oxidation rates low. Soil disturbance by itself had no detectable effect on fluxes in any of the sites. Results confirm the overriding importance of elevated N for suppressing CH₄ oxidation in managed and unmanaged ecosystems, and suggest further that recovery of CH₄ suppression following agriculture is related to slow-changing soil properties such as soil organic matter composition or microbial community structure.

Abbreviations: KBS, W.K. Kellogg Biological Station

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