Details
Originalsprache | Englisch |
---|---|
Seiten (von - bis) | 560-565 |
Seitenumfang | 6 |
Fachzeitschrift | Nature geoscience |
Jahrgang | 13 |
Ausgabenummer | 8 |
Frühes Online-Datum | 20 Juli 2020 |
Publikationsstatus | Veröffentlicht - Aug. 2020 |
Abstract
As global temperatures continue to rise, a key uncertainty of climate projections is the microbial decomposition of vast organic carbon stocks in thawing permafrost soils. Decomposition rates can accelerate up to fourfold in the presence of plant roots, and this mechanism—termed the rhizosphere priming effect—may be especially relevant to thawing permafrost soils as rising temperatures also stimulate plant productivity in the Arctic. However, priming is currently not explicitly included in any model projections of future carbon losses from the permafrost area. Here, we combine high-resolution spatial and depth-resolved datasets of key plant and permafrost properties with empirical relationships of priming effects from living plants on microbial respiration. We show that rhizosphere priming amplifies overall soil respiration in permafrost-affected ecosystems by ~12%, which translates to a priming-induced absolute loss of ~40 Pg soil carbon from the northern permafrost area by 2100. Our findings highlight the need to include fine-scale ecological interactions in order to accurately predict large-scale greenhouse gas emissions, and suggest even tighter restrictions on the estimated 200 Pg anthropogenic carbon emission budget to keep global warming below 1.5 °C.
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in: Nature geoscience, Jahrgang 13, Nr. 8, 08.2020, S. 560-565.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Carbon loss from northern circumpolar permafrost soils amplified by rhizosphere priming
AU - Keuper, Frida
AU - Wild, Birgit
AU - Kummu, Matti
AU - Beer, Christian
AU - Blume-Werry, Gesche
AU - Fontaine, Sébastien
AU - Gavazov, Konstantin
AU - Gentsch, Norman
AU - Guggenberger, Georg
AU - Hugelius, Gustaf
AU - Jalava, Mika
AU - Koven, Charles
AU - Krab, Eveline J.
AU - Kuhry, Peter
AU - Monteux, Sylvain
AU - Richter, Andreas
AU - Shahzad, Tanvir
AU - Weedon, James T.
AU - Dorrepaal, Ellen
N1 - Funding information: We thank P. Thornton, F. Dijkstra, Y. Carrillo and R. E. Hewitt for providing additional information on published data. Figure 1a–c is courtesy of R. Miedema (IN Produktie, Amsterdam). This study was supported by funding from: the Swedish Research Council (VR) (grant number 621-2011-5444), Formas (grant number 214-2011-788) and the Knut and Alice Wallenberg Foundation (grant number KAW 2012.0152) (all awarded to E.D.); Academy of Finland-funded projects SCART (grant number 267463) and WASCO (grant number 305471), Emil Aaltonen Foundation-funded project ‘eat-less-water’, the European Research Council under the European Union’s Horizon 2020 Research and Innovation Programme (grant agreement number 819202), and Maa-ja vesitekniikan tuki ry (all awarded to M.K.); the JPI Climate Project COUP-Austria (BMWFW-6.020/0008) (awarded to A.R.); two projects funded by the Swedish Research Council, the EU JPI Climate COUP project (E0689701) and the Project INCA (E0641701)–Marie Sklodowska-Curie Actions cofund (600398) (awarded to G.H.); the Deutsche Forschungsgemeinschaft (BE 6485/1-1) (to C.B.); and the US DOE BER RGMA programme through the RUBISCO SFA and ECRP projects (to C.K.).
PY - 2020/8
Y1 - 2020/8
N2 - As global temperatures continue to rise, a key uncertainty of climate projections is the microbial decomposition of vast organic carbon stocks in thawing permafrost soils. Decomposition rates can accelerate up to fourfold in the presence of plant roots, and this mechanism—termed the rhizosphere priming effect—may be especially relevant to thawing permafrost soils as rising temperatures also stimulate plant productivity in the Arctic. However, priming is currently not explicitly included in any model projections of future carbon losses from the permafrost area. Here, we combine high-resolution spatial and depth-resolved datasets of key plant and permafrost properties with empirical relationships of priming effects from living plants on microbial respiration. We show that rhizosphere priming amplifies overall soil respiration in permafrost-affected ecosystems by ~12%, which translates to a priming-induced absolute loss of ~40 Pg soil carbon from the northern permafrost area by 2100. Our findings highlight the need to include fine-scale ecological interactions in order to accurately predict large-scale greenhouse gas emissions, and suggest even tighter restrictions on the estimated 200 Pg anthropogenic carbon emission budget to keep global warming below 1.5 °C.
AB - As global temperatures continue to rise, a key uncertainty of climate projections is the microbial decomposition of vast organic carbon stocks in thawing permafrost soils. Decomposition rates can accelerate up to fourfold in the presence of plant roots, and this mechanism—termed the rhizosphere priming effect—may be especially relevant to thawing permafrost soils as rising temperatures also stimulate plant productivity in the Arctic. However, priming is currently not explicitly included in any model projections of future carbon losses from the permafrost area. Here, we combine high-resolution spatial and depth-resolved datasets of key plant and permafrost properties with empirical relationships of priming effects from living plants on microbial respiration. We show that rhizosphere priming amplifies overall soil respiration in permafrost-affected ecosystems by ~12%, which translates to a priming-induced absolute loss of ~40 Pg soil carbon from the northern permafrost area by 2100. Our findings highlight the need to include fine-scale ecological interactions in order to accurately predict large-scale greenhouse gas emissions, and suggest even tighter restrictions on the estimated 200 Pg anthropogenic carbon emission budget to keep global warming below 1.5 °C.
UR - http://www.scopus.com/inward/record.url?scp=85088262039&partnerID=8YFLogxK
U2 - 10.1038/s41561-020-0607-0
DO - 10.1038/s41561-020-0607-0
M3 - Article
AN - SCOPUS:85088262039
VL - 13
SP - 560
EP - 565
JO - Nature geoscience
JF - Nature geoscience
SN - 1752-0894
IS - 8
ER -