caa a22 4500 60551688X CHVBK 20210128100716.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s10533-014-0059-y doi (NATIONALLICENCE)springer-10.1007/s10533-014-0059-y Sustained impact of drought on wet shrublands mediated by soil physical changes [Elektronische Daten] [María Domínguez, Alwyn Sowerby, Andrew Smith, David Robinson, Susie Van Baarsel, Rob Mills, Miles Marshall, Eva Koller, Inma Lebron, Jane Hall, Bridget Emmett] Projected 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. Springer International Publishing Switzerland, 2014 Soil respiration nationallicence Acclimation nationallicence Water retention nationallicence Warming nationallicence Bryophyte nationallicence Calluna vulgaris nationallicence Soil structure nationallicence Domínguez María Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut Sowerby Alwyn Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut Smith Andrew Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut Robinson David Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut Van Baarsel Susie Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut Mills Rob Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut Marshall Miles Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut Koller Eva Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut Lebron Inma Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut Hall Jane Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut Emmett Bridget Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut Biogeochemistry Springer International Publishing 122/2-3(2015-02-01), 151-163 0168-2563 122:2-3<151 2015 122 10533 https://doi.org/10.1007/s10533-014-0059-y text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 review-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10533-014-0059-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Domínguez María Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut NATIONALLICENCE 700 1- Sowerby Alwyn Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut NATIONALLICENCE 700 1- Smith Andrew Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut NATIONALLICENCE 700 1- Robinson David Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut NATIONALLICENCE 700 1- Van Baarsel Susie Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut NATIONALLICENCE 700 1- Mills Rob Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut NATIONALLICENCE 700 1- Marshall Miles Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut NATIONALLICENCE 700 1- Koller Eva Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut NATIONALLICENCE 700 1- Lebron Inma Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut NATIONALLICENCE 700 1- Hall Jane Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut NATIONALLICENCE 700 1- Emmett Bridget Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, LL57 2UW, Bangor, Gwynedd, UK aut NATIONALLICENCE 773 0- Biogeochemistry Springer International Publishing 122/2-3(2015-02-01), 151-163 0168-2563 122:2-3<151 2015 122 10533