Effect of the organic horizon on methane oxidation and uptake in soil of a boreal Scots pine forest

Autor:	Pertti J. Martikainen, Juha Heiskanen, Anne Saari
Rok vydání:	1998
Předmět:	chemistry.chemical_classification Irrigation Ecology Taiga Scots pine Soil science Biology biology.organism_classification Applied Microbiology and Biotechnology Microbiology chemistry Environmental chemistry Anaerobic oxidation of methane Soil water Soil horizon Organic matter Water content
Zdroj:	FEMS Microbiology Ecology. 26:245-255
ISSN:	1574-6941 0168-6496
DOI:	10.1111/j.1574-6941.1998.tb00509.x
Popis:	We studied in situ and in the laboratory whether the organic horizon (O horizon) could act as a physical ‘buffer system’ against soil dryness and water stress for the CH4 oxidizing microbes in boreal coniferous forest soil. The laboratory experiments with samples from a Scots pine forest soil showed that the CH4 oxidation took place in the uppermost mineral soil and was not affected by removal of the O horizon (peeling) and irrigation. The removal of a thin O horizon (2–3 cm) in early June increased the mean summertime uptake of CH4 by 50% and decreased the release of CO2 by 50%. Thus, the O horizon acts as a diffusion barrier, lowering the uptake rate of atmospheric CH4. The experimental 50% increase in precipitation by irrigation (from 58 to 84 mm month−1) had only a marginal effect on the gas fluxes in both control plots and peeled plots. During the study summer two dry periods with low matric potentials (
Databáze:	OpenAIRE
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