Atmospheric Methane Consumption by Forest Soils and Extracted Bacteria at Different pH Values

Applied and Environmental Microbiology
J A AmaralR Knowles

Abstract

The effect of pH on atmospheric methane (CH4) consumption was studied with slurries of forest soils and with bacteria extracted from the same soils. Soil samples were collected from a mixed hardwood stand in New Hampshire, from jackpine and aspen stands at the BOREAS (Boreal Ecosystem Atmosphere Study) site near Thompson, northern Manitoba, from sites in southern Québec, including a beech stand and a meadow, and from a site in Ontario (cultivated humisol). Consumption of atmospheric CH4 (concentration, approximately 1.8 ppm) occurred at depths of >5 cm in both acidic (pH 4.5 to 5.2) and alkaline (pH 7.2 to 7.8) soils. In slurries of acidic soils, maximum activity occurred at different pH values (pH 4.0 to 6.5). Bacteria extracted from these soils by high-speed blending and density gradient centrifugation showed pH responses different from the pH responses of the slurries. In all cases, these bacteria had a methanotrophy pH optimum of 5.8 and exhibited no activity at pH 6.8 to 7.0, the pH optimum range for known methanotrophs. This difference in pH responses could be useful in modifying media currently used for isolation of these organisms. Methanotrophic activity was induced in previously non-CH4-consuming soils by preincubatio...Continue Reading

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Citations

Apr 9, 2009·Applied Microbiology and Biotechnology·Sukhwan YoonJeremy D Semrau
Nov 1, 2004·FEMS Microbiology Ecology·Krista JaatinenHannu Fritze
Sep 7, 2011·Applied Microbiology and Biotechnology·Louis-B JugniaCharles W Greer
May 31, 2013·Environmental Microbiology·Loïc NazariesBrajesh K Singh
Aug 30, 2001·Applied and Environmental Microbiology·D G BourneJ C Murrell
Jan 4, 2001·FEMS Microbiology Ecology·J Benstead, G M King
Sep 3, 2011·Environmental Microbiology·Jennifer PratscherRalf Conrad
Aug 31, 2000·Applied and Environmental Microbiology·K Nanba, G M King
May 2, 2000·Applied and Environmental Microbiology·T HenckelR Conrad
Oct 1, 2009·Environmental Microbiology Reports·Steffen Kolb
Sep 14, 2018·Frontiers in Microbiology·Ngoc-Loi NguyenSung-Keun Rhee
Nov 3, 2020·Global Change Biology·Jana TäumerSven Marhan
Sep 3, 1999·Applied and Environmental Microbiology·P Roslev, N Iversen

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