Biotic and Abiotic Drivers of Topsoil Organic Carbon Concentration in Drylands Have Similar Effects at Regional and Global Scales

Authors Organisations
  • Juan J. Gaitán(Author)
    Instituto Nacional de Tecnologia Agropecuaria
    Universidad Nacional de Luján
    National Research Council (CONICET), Argentina
  • Fernando T. Maestre(Author)
    King Juan Carlos University
  • Donaldo E. Bran(Author)
    Instituto Nacional de Tecnologia Agropecuaria
  • Gustavo G. Buono(Author)
    Instituto Nacional de Tecnologia Agropecuaria
  • Andrew J. Dougill(Author)
    University of Leeds
  • Guillermo García Martinez(Author)
    Instituto Nacional de Tecnologia Agropecuaria
  • Daniela Ferrante(Author)
    Instituto Nacional de Tecnologia Agropecuaria
  • Reginald T. Guuroh(Author)
    CSIR-Forestry Research Institute of Ghana
    Instituto Nacional de Tecnologia Agropecuaria
  • Anja Lindstaeter(Author)
    University of Cologne
    University of Bonn
  • Virginia Massara(Author)
    Instituto Nacional de Tecnologia Agropecuaria
  • Andrew Thomas(Author)
  • Gabriel E. Oliva(Author)
    Instituto Nacional de Tecnologia Agropecuaria
Type Article
Original languageEnglish
Pages (from-to)1445-1456
Number of pages12
JournalEcosystems
Volume22
Issue number7
Early online date04 Mar 2019
DOI
Publication statusPublished - 01 Nov 2019
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Abstract

Drylands contain 25% of the world’s soil organic carbon (SOC), which is controlled by many factors, both abiotic and biotic. Thus, understanding how these factors control SOC concentration can help to design more sustainable land-use practices in drylands aiming to foster and preserve SOC storage, something particularly important to fight ongoing global warming. We use two independent, large-scale databases with contrasting geographic coverage (236 sites in global drylands and 185 sites in Patagonia, Argentina) to evaluate the relative importance of abiotic (precipitation, temperature and soil texture) and biotic (primary productivity) factors as drivers of SOC concentration in drylands at global and regional scales. We found that biotic and abiotic factors had similar effects on SOC concentration across regional and global scales: Maximum temperature and sand content had negative effects, while precipitation and plant productivity exerted positive effects. Our findings provide empirical evidence that increases in temperature and reductions in rainfall, as forecasted by climatic models in many drylands worldwide, promote declines in SOC both directly and indirectly via the reduction in plant productivity. This has important implications for the conservation of drylands under climate change; land management should seek to enhance plant productivity as a tool to offset the negative impact of climate change on SOC storage and on associated ecosystem services

Keywords

  • climate change, precipitation, temperature, soil texture, ecosystem services, aboveground net primary productivity

Documents

  • Biotic and Abiotic Drivers of Topsoil Organic Carbon Concentration in Drylands Have Similar Effects at Regional and Global Scales

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