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dc.contributor.authorDomínguez, María Teresaes_ES
dc.contributor.authorEmmett, B. A.es_ES
dc.identifier.citationBiogeochemistry 122: 151-163 (2015)es_ES
dc.description13 páginas.-- 6 figuras.-- 52 referencias.-- The online version of this article (doi:10.1007/s10533-014-0059-y) contains supplementary material, which is available to authorized users.-- Domínguez, María Teresa et al...es_ES
dc.description.abstractProjected climate warming may substantially increase carbon emissions from wet organic soils, contributing to a positive feedback between the terrestrial carbon cycle and climate change. Evidence suggests that in these soils the stimulation of soil respiration by warming can be sustained over long periods of time due to the large availability of C substrates. However, the long-term response of wet organic soils to drought remains uncertain. Organo-mineral soils might be particularly vulnerable, because of their limited soil moisture pool to buffer drought events. Using a whole-ecosystem climate-change experiment in North Wales (UK) we show that soil respiration in podzolic (organo-mineral) soils from wet shrublands is more vulnerable to recurrent drought than to warming, and that the drought impact does not attenuate at decadal time scales. Stimulation of soil respiration by drought was linked to major changes in soil structure that led to a 54 % reduction in water holding capacity compared to control. Bryophyte abundance was found to buffer soil moisture losses, moderating soil CO2 efflux under warming. As there was no evidence of change in plant productivity to offset the increased soil C emissions under drought, this response may result in a positive climate feedback. The results indicate the potentially critical role that changes in sub-dominant vegetation and in soil physical properties may have in determining climate change impacts on soil C dynamics.es_ES
dc.description.sponsorshipWe thank all the CEH staff members who have contributed to the experiment establishment and maintenance over the years, in particular David Williams. This research was funded by the EU projects CLIMOOR, VULCAN and INCREASE FP7-INFRASTRUCTURE-2008-1 (Grant Agreement no. 227628)—the INCREASE project. M.T.D was supported by two postdoctoral fellowships awarded by the Spanish National Science and Technology Foundationes_ES
dc.subjectSoil respirationes_ES
dc.subjectWater retentiones_ES
dc.subjectCalluna vulgarises_ES
dc.subjectSoil structurees_ES
dc.titleSustained impact of drought on wet shrublands mediated by soil physical changeses_ES
dc.description.peerreviewedPeer reviewedes_ES
dc.contributor.funderFundación Española para la Ciencia y la Tecnologíaes_ES
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