Soil carbon loss in warmed subarctic grasslands is rapid and restricted to topsoil

Niel Verbrigghe, Niki I. W. Leblans, Bjarni D. Sigurdsson, Sara Vicca, Chao Fang, Lucia Fuchslueger, Jennifer L. Soong, James T. Weedon, Christopher Poeplau, Cristina Ariza-Carricondo, Michael Bahn, Bertrand Guenet, Per Gundersen, Gunnhildur E. Gunnarsdottir, Thomas Kaetterer, Zhanfeng Liu, Marja Maljanen, Sara Maranon-Jimenez, Kathiravan Meeran, Edda S. OddsdottirIvika Ostonen, Josep Penuelas, Andreas Richter, Jordi Sardans, Pall Sigurthsson, Margaret S. Torn, Peter M. Van Bodegom, Erik Verbruggen, Tom W. N. Walker, Hakan Wallander, Ivan A. Janssens

Onderzoeksoutput: Bijdrage aan tijdschriftArtikelpeer review

Uittreksel

Global warming may lead to carbon transfers from soils to the atmosphere, yet this positive feedback to the climate system remains highly uncertain, especially in subsoils (Ilyina and Friedlingstein, 2016; Shi et al., 2018). Using natural geothermal soil warming gradients of up to +6.4 ∘C in subarctic grasslands (Sigurdsson et al., 2016), we show that soil organic carbon (SOC) stocks decline strongly and linearly with warming (−2.8 t ha−1 ∘C−1). Comparison of SOC stock changes following medium-term (5 and 10 years) and long-term (>50 years) warming revealed that all SOC stock reduction occurred within the first 5 years of warming, after which continued warming no longer reduced SOC stocks. This rapid equilibration of SOC observed in Andosol suggests a critical role for ecosystem adaptations to warming and could imply short-lived soil carbon–climate feedbacks. Our data further revealed that the soil C loss occurred in all aggregate size fractions and that SOC stock reduction was only visible in topsoil (0–10 cm). SOC stocks in subsoil (10–30 cm), where plant roots were absent, showed apparent conservation after >50 years of warming. The observed depth-dependent warming responses indicate that explicit vertical resolution is a prerequisite for global models to accurately project future SOC stocks for this soil type and should be investigated for soils with other mineralogies.
Oorspronkelijke taalEngels
TijdschriftBIOGEOSCIENCES
Volume19
Exemplaarnummer14
Pagina's (van-tot)3381-3393
ISSN1726-4170
DOI's
PublicatiestatusGepubliceerd - 20-jul.-2022

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