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Plant-derived compounds stimulate the decomposition of organic matter in arctic permafrost soils

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  • Birgit Wild
  • Norman Gentsch
  • Petr Čapek
  • Kateřina Diáková
  • Ricardo J Eloy Alves
  • Jiři Bárta
  • Antje Gittel
  • Gustaf Hugelius
  • Anna Knoltsch
  • Peter Kuhry
  • Nikolay Lashchinskiy
  • Robert Mikutta
  • Juri Palmtag
  • Christa Schleper
  • Jörg Schnecker
  • Olga Shibistova
  • Vigdis L Torsvik
  • Tim Urich
  • Margarete Watzka
  • Hana Šantrůčková
  • Georg Guggenberger
  • Andreas Richter
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Article number25607
<mark>Journal publication date</mark>9/05/2016
<mark>Journal</mark>Scientific Reports
Volume6
Number of pages11
Publication statusPublished
Original languageEnglish

Abstract

Arctic ecosystems are warming rapidly, which is expected to promote soil organic matter (SOM) decomposition. In addition to the direct warming effect, decomposition can also be indirectly stimulated via increased plant productivity and plant-soil C allocation, and this so called "priming effect" might significantly alter the ecosystem C balance. In this study, we provide first mechanistic insights into the susceptibility of SOM decomposition in arctic permafrost soils to priming. By comparing 119 soils from four locations across the Siberian Arctic that cover all horizons of active layer and upper permafrost, we found that an increased availability of plant-derived organic C particularly stimulated decomposition in subsoil horizons where most of the arctic soil carbon is located. Considering the 1,035 Pg of arctic soil carbon, such an additional stimulation of decomposition beyond the direct temperature effect can accelerate net ecosystem C losses, and amplify the positive feedback to global warming.