Contrasting mechanisms underlie short‐ and longer‐term soil respiration responses to experimental warming in a dryland ecosystem
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Title: | Contrasting mechanisms underlie short‐ and longer‐term soil respiration responses to experimental warming in a dryland ecosystem |
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Authors: | Dacal, Marina | García‐Palacios, Pablo | Asensio, Sergio | Cano‐Díaz, Concha | Gozalo, Beatriz | Ochoa, Victoria | Maestre, Fernando T. |
Center, Department or Service: | Universidad de Alicante. Departamento de Ecología | Universidad de Alicante. Instituto Multidisciplinar para el Estudio del Medio "Ramón Margalef" |
Keywords: | Biocrusts | Dryland | Microbial thermal acclimation | Short-term versus longer-term warming | Soil moisture | Soil respiration | Soil temperature |
Knowledge Area: | Ecología |
Issue Date: | Sep-2020 |
Publisher: | John Wiley & Sons |
Citation: | Global Change Biology. 2020, 26(9): 5254-5266. https://doi.org/10.1111/gcb.15209 |
Abstract: | Soil carbon losses to the atmosphere through soil respiration are expected to rise with ongoing temperature increases, but available evidence from mesic biomes suggests that such response disappears after a few years of experimental warming. However, there is lack of empirical basis for these temporal dynamics in soil respiration responses, and for the mechanisms underlying them, in drylands, which collectively form the largest biome on Earth and store 32% of the global soil organic carbon pool. We coupled data from a 10 year warming experiment in a biocrust‐dominated dryland ecosystem with laboratory incubations to confront 0–2 years (short‐term hereafter) versus 8–10 years (longer‐term hereafter) soil respiration responses to warming. Our results showed that increased soil respiration rates with short‐term warming observed in areas with high biocrust cover returned to control levels in the longer‐term. Warming‐induced increases in soil temperature were the main drivers of the short‐term soil respiration responses, whereas longer‐term soil respiration responses to warming were primarily driven by thermal acclimation and warming‐induced reductions in biocrust cover. Our results highlight the importance of evaluating short‐ and longer‐term soil respiration responses to warming as a mean to reduce the uncertainty in predicting the soil carbon–climate feedback in drylands. |
Sponsor: | This research was funded by the European Research Council (ERC Grant agreements 242658 [BIOCOM] and 647038 [BIODESERT]). M.D. is supported by an FPU fellowship from the Spanish Ministry of Education, Culture and Sports (FPU-15/00392). P.G.-P. is supported by a Ramón y Cajal grant from the Spanish Ministry of Science and Innovation (RYC2018-024766-I). S.A. acknowledges the Spanish MINECO for financial support via the DIGGING_DEEPER project through the 2015–2016 BiodivERsA3/FACCE-JPI joint call for research proposals. F.T.M. and S.A. acknowledge support from the Generalitat Valenciana (CIDEGENT/2018/041). C.C.-D. acknowledges support from the European Research Council (ERC Grant 647038 [BIODESERT]). |
URI: | http://hdl.handle.net/10045/108730 |
ISSN: | 1354-1013 (Print) | 1365-2486 (Online) |
DOI: | 10.1111/gcb.15209 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Rights: | © 2020 John Wiley & Sons Ltd |
Peer Review: | si |
Publisher version: | https://doi.org/10.1111/gcb.15209 |
Appears in Collections: | INV - DRYLAB - Artículos de Revistas Personal Investigador sin Adscripción a Grupo Research funded by the EU |
Files in This Item:
File | Description | Size | Format | |
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Dacal_etal_2020_GlobalChangeBiology_final.pdf | Versión final (acceso restringido) | 1,32 MB | Adobe PDF | Open Request a copy |
Dacal_etal_2020_GlobalChangeBiology_accepted.pdf | Accepted Manuscript (acceso abierto) | 14,29 MB | Adobe PDF | Open Preview |
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