Reference : Short-term temperature impact on soil heterotrophic respiration in limed agricultural so...

	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
	To cite this reference:	http://hdl.handle.net/2268/116838

Title :	Short-term temperature impact on soil heterotrophic respiration in limed agricultural soil samples
Language :	English
Alternative title :	[fr] Impacts de la température à court terme sur la respiration hétérotrophe du sol dans des échantillons de sol agricole chaulé.
Author, co-author :	Buysse, Pauline [Université de Liège - ULg > Sciences et technologie de l'environnement > Physique des bio-systèmes >]
	Goffin, Stéphanie [Université de Liège - ULg > Sciences et technologie de l'environnement > Physique des bio-systèmes >]
	Carnol, Monique [Université de Liège - ULg > Département de Biologie, Ecologie et Evolution > Ecologie végétale et microbienne >]
	Malchair, Sandrine [Université de Liège - ULg > Département de Biologie, Ecologie et Evolution > Ecologie végétale et microbienne >]
	Debacq, Alain [Université de Liège - ULg > Sciences et technologie de l'environnement > Physique des bio-systèmes >]
	Longdoz, Bernard [> >]
	Aubinet, Marc [Université de Liège - ULg > Sciences et technologie de l'environnement > Physique des bio-systèmes >]
Publication date :	Mar-2013
Journal title :	Biogeochemistry
Publisher :	Springer Science & Business Media B.V.
Volume :	112
Issue/season :	1-3
Pages :	441-455
Audience :	International
ISSN :	0168-2563
City :	Dordrecht
Country :	The Netherlands
Keywords :	[en] soil CO2 flux ; temperature ; limed agricultural soil ; incubation experiment ; organic carbon model ; short-term
Abstract :	[en] This study sought to investigate the hourly and daily timescale responses of soil CO2 fluxes to temperature in a limed agricultural soil. Observations from different incubation experiments were compared with the results of a model combining biotic (heterotrophic respiration) and abiotic (carbonate weathering) components. Several samples were pre-incubated for 8-9 days at three temperatures (5, 15 and 25°C) and then submitted to short-term temperature cycles (where the temperature was increased from 5 to 35°C in 10°C stages, with each stage being 3 h long). During the temperature cycles (hourly timescale), the soil CO2 fluxes increased significantly with temperature under all pre-incubation temperature treatments. A hysteresis effect and negative fluxes during cooling phases were also systematically observed. At a given hourly timescale temperature, there was a negative relationship of the CO2 fluxes with the pre-incubation temperature. Using the combined model allowed the experimental results to be clearly described, including the negative fluxes and the hysteresis effect, showing the potentially large contribution of abiotic fluxes to total fluxes in limed soils, after short-term temperature changes. The fairly good agreement between the measured and simulated flux results also suggested that the biotic flux temperature sensitivity was probably unaffected by timescale (hourly or daily) or pre-incubation temperature. The negative relationship of the CO2 fluxes with the pre-incubation temperature probably derived from very labile soil carbon depletion, as shown in the simulations. This was not, however, confirmed by soil carbon measurements, which leaves open the possibility of adaptation within the microbial community.
Funders :	Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Name of the research project :	Modélisation de la respiration de sols agricoles
Permalink :	http://hdl.handle.net/2268/116838
DOI :	10.1007/s10533-012-9739-7

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