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dc.contributor.authorGarcia-Pausas, Jordi
dc.contributor.authorRomanyà i Socoró, Joan
dc.contributor.authorMontané, Francesc
dc.contributor.authorRios, Ana I.
dc.contributor.authorTaull, Marc
dc.contributor.authorRovira, Pere
dc.contributor.authorCasals, Pere
dc.description.abstractMountain grasslands are generally rich in soil organic C, but the typical high spatial variability of mountain environments, together with the different management systems, makes their soil C content particularly variable. Socio-economic changes of the past decades have caused a progressive abandonment of the traditional use for grazing of some areas, while grazing pressure at easily accessible grasslands have increased. Here, we analyse the effect of these land-use changes on the factors regulating the soil C accumulation and stocks. Overgrazing generally leads to a reduction above- and below-ground litter inputs and a decrease in soil C stocks, affecting some soil physicochemical and biological properties. Additionally, the labile C inputs coming from animal faeces may accelerate the mineralisation of organic matter. Grazing abandonment causes a reduction of aboveground productivity, but the lack of consumption causes a short-term accumulation of organic matter. Its effect on belowground biomass and productivity is less clear. At longer term, grazing abandonment causes a change in the plant community composition, having the shrub encroachment the strongest effect on C storage. The low biochemical quality of shrub litter delays its decomposition and allows higher organic matter accumulation in the topsoil. But the effect of shrub proliferation at the deeper soil is less clear. The low root turnover of shrubs compared to grasses may reduce the C inputs to the soil. But, at the same time, the reduction of the root exudates may also reduce the microbial activity and the organic matter mineralisation.ca_ES
dc.description.sponsorshipThis study summarises the work done in different research projects funded by the Ministerio de Economia y Competitividad, Spain (Carbopas, REN2002-04300-C02-02; VULCA, CGL2005-08133-CO3; GRACCIE Consolider Program, CSD2007-00067) and by the European Commission (GHG-Europe project, FP7-ENV-2009-1, project No. 244122). J.G.P. and P.C. are financially supported by the Spanish Ministerio de Economía y Competitividad, through Juan de la Cierva and Ramón y Cajal contracts, respectively.ca_ES
dc.publisherSpringer Openca_ES
dc.relation.isformatofReproducció del document publicat a:
dc.relation.ispartofHigh mountain conservation in a changing world / Jordi Catalan, Josep M. Ninot, M. Mercè Aniz, editors. Dordrecht : Springer Open, 2017. p. 207-230ca_ES
dc.rightscc-by (c) Garcia-Pausas, Jordi et al., 2017ca_ES
dc.subjectGrassland abandonmentca_ES
dc.subjectLand-use changesca_ES
dc.subjectMountain grasslandsca_ES
dc.subjectGrazing intensificationca_ES
dc.subjectShrub encroachmentca_ES
dc.subjectSoil organic carbonca_ES
dc.titleAre soil carbon stocks in mountain grasslands compromised by land-use changes?ca_ES

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cc-by (c) Garcia-Pausas, Jordi et al., 2017
Except where otherwise noted, this item's license is described as cc-by (c) Garcia-Pausas, Jordi et al., 2017