Shrubland primary production and soil respiration diverge along European climate gradient

Sabine Reinsch, Eva Koller, Alwyn Sowerby, Giovanbattista De Dato, Marc Estiarte, Gabriele Guidolotti, Edit Kovács-Láng, György Kröel-Dulay, Eszter Lellei-Kovács, Klaus S. Larsen, Dario Liberati, Josep Peñuelas, Johannes Ransijn, David A. Robinson, Inger K. Schmidt, Andrew R. Smith, Albert Tietema, Jeffrey S. Dukes, Claus Beier, Bridget A. Emmett

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    13 Citations (Scopus)

    Abstract

    © The Author(s) 2017. Above- and belowground carbon (C) stores of terrestrial ecosystems are vulnerable to environmental change. Ecosystem C balances in response to environmental changes have been quantified at individual sites, but the magnitudes and directions of these responses along environmental gradients remain uncertain. Here we show the responses of ecosystem C to 8-12 years of experimental drought and night-time warming across an aridity gradient spanning seven European shrublands using indices of C assimilation (aboveground net primary production: aNPP) and soil C efflux (soil respiration: Rs). The changes of aNPP and Rs in response to drought indicated that wet systems had an overall risk of increased loss of C but drier systems did not. Warming had no consistent effect on aNPP across the climate gradient, but suppressed Rs more at the drier sites. Our findings suggest that above- and belowground C fluxes can decouple, and provide no evidence of acclimation to environmental change at a decadal timescale. aNPP and Rs especially differed in their sensitivity to drought and warming, with belowground processes being more sensitive to environmental change.
    Original languageEnglish
    Article number43952
    JournalScientific Reports
    Volume7
    DOIs
    Publication statusPublished - 3 Mar 2017

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