Five years of whole-soil warming led to loss of subsoil carbon stocks and increased CO 2 efflux.

Autor: Soong JL; Climate Sciences Department, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. jennifer.soong@colostate.edu mstorn@lbl.gov., Castanha C; Climate Sciences Department, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA., Hicks Pries CE; Department of Biological Sciences, Dartmouth College, Hanover, NH 03755, USA., Ofiti N; Department of Geography, University of Zurich, Zurich 8057, Switzerland., Porras RC; Climate Sciences Department, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA., Riley WJ; Climate Sciences Department, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA., Schmidt MWI; Department of Geography, University of Zurich, Zurich 8057, Switzerland., Torn MS; Climate Sciences Department, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. jennifer.soong@colostate.edu mstorn@lbl.gov.; Energy Resources Group, University of California at Berkeley, Berkeley, CA 94720, USA.
Jazyk: angličtina
Zdroj: Science advances [Sci Adv] 2021 May 21; Vol. 7 (21). Date of Electronic Publication: 2021 May 21 (Print Publication: 2021).
DOI: 10.1126/sciadv.abd1343
Abstrakt: Subsoils below 20 cm are an important reservoir in the global carbon cycle, but little is known about their vulnerability under climate change. We measured a statistically significant loss of subsoil carbon (-33 ± 11%) in warmed plots of a conifer forest after 4.5 years of whole-soil warming (4°C). The loss of subsoil carbon was primarily from unprotected particulate organic matter. Warming also stimulated a sustained 30 ± 4% increase in soil CO 2 efflux due to increased CO 2 production through the whole-soil profile. The observed in situ decline in subsoil carbon stocks with warming is now definitive evidence of a positive soil carbon-climate feedback, which could not be concluded based on increases in CO 2 effluxes alone. The high sensitivity of subsoil carbon and the different responses of soil organic matter pools suggest that models must represent these heterogeneous soil dynamics to accurately predict future feedbacks to warming.
(Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).)
Databáze: MEDLINE
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