globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-014-0059-y
Scopus记录号: 2-s2.0-84925543391
论文题名:
Sustained impact of drought on wet shrublands mediated by soil physical changes
作者: Domínguez M.T.; Sowerby A.; Smith A.R.; Robinson D.A.; Van Baarsel S.; Mills R.T.E.; Marshall M.R.; Koller E.; Lebron I.; Hall J.; Emmett B.A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 122, 期:2018-02-03
起始页码: 151
结束页码: 163
语种: 英语
英文关键词: Acclimation ; Bryophyte ; Calluna vulgaris ; Soil respiration ; Soil structure ; Warming ; Water retention
英文摘要: 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. © 2014, Springer International Publishing Switzerland.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83535
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Centre for Ecology and Hydrology Bangor, Natural Environment Research Council, Deiniol Road, Bangor, Gwynedd, United Kingdom; Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS-CSIC), 10 Reina Mercedes Av, Seville, Spain; School of Environment, Natural Resources and Geography, Bangor University, Deiniol Road, Bangor, Gwynedd, United Kingdom; WSL Swiss Federal Research Institute for Forest, Snow and Landscape Research, Site Lausanne, Station 2, Lausanne, Switzerland; Laboratory of Ecological Systems (ECOS), School of Architecture, Civil and Environmental Engineering (ENAC), École Polytechnique Fédérale de Lausanne (EPFL), Station 2, Lausanne, Switzerland

Recommended Citation:
Domínguez M.T.,Sowerby A.,Smith A.R.,et al. Sustained impact of drought on wet shrublands mediated by soil physical changes[J]. Biogeochemistry,2015-01-01,122(2018-02-03)
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