Are soil carbon stocks in mountain grasslands compromised by land-use changes?

Garcia-Pausas, Jordi; Romanyà i Socoró, Joan; Montané, Francesc; Rios, Ana I.; Taull, Marc; Rovira, Pere; Casals, Pere

doi:https://doi.org/10.1007/978-3-319-55982-7_9

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Issue date

2017-08-05

Author

Garcia-Pausas, Jordi

Romanyà i Socoró, Joan

Montané, Francesc

Rios, Ana I.

Taull, Marc

Rovira, Pere

Casals, Pere

Suggested citation

Garcia-Pausas, Jordi; Romanyà i Socoró, Joan; Montané, Francesc; Rios, Ana I.; Taull, Marc; Rovira, Pere; Casals, Pere; . (2017) . Are soil carbon stocks in mountain grasslands compromised by land-use changes?. High mountain conservation in a changing world / Jordi Catalan, Josep M. Ninot, M. Mercè Aniz, editors. Dordrecht : Springer Open, 2017. p. 207-230. Springer Open. https://doi.org/10.1007/978-3-319-55982-7_9.

Abstract

Mountain 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.

URI

http://hdl.handle.net/10459.1/69235

DOI

https://doi.org/10.1007/978-3-319-55982-7_9

Is part of

High mountain conservation in a changing world / Jordi Catalan, Josep M. Ninot, M. Mercè Aniz, editors. Dordrecht : Springer Open, 2017. p. 207-230

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