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Carbon loss from northern circumpolar permafrost soils amplified by rhizosphere priming

Frida Keuper 1, 2, 3 Birgit Wild 4, 5, 6 Matti Kummu 7, 5, 8, 9 Christian Beer 10 Gesche Blume-Werry 11, 12 Sébastien Fontaine 13 Konstantin Gavazov 11, 14 Norman Gentsch 15 Georg Guggenberger 15 Gustaf Hugelius 5, 4 Mika Jalava 7 Charles Koven 16 Eveline Krab 11, 17 Peter Kuhry 4 Sylvain Monteux 11 Andreas Richter 18, 19 Tanvir Shahzad 20 James Weedon 21 Ellen Dorrepaal 11 
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 similar to 12%, which translates to a priming-induced absolute loss of similar to 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 degrees C.
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Submitted on : Friday, November 27, 2020 - 12:38:25 PM
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Frida Keuper, Birgit Wild, Matti Kummu, Christian Beer, Gesche Blume-Werry, et al.. Carbon loss from northern circumpolar permafrost soils amplified by rhizosphere priming. Nature Geoscience, Nature Publishing Group, 2020, 13 (8), pp.560-565. ⟨10.1038/s41561-020-0607-0⟩. ⟨hal-03027874⟩



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