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Previously Unrecognized Land-Use Control on Deep Soil CO2 Sink.

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Τίτλος: Previously Unrecognized Land-Use Control on Deep Soil CO2 Sink.
Συγγραφείς: Tetteh K; Institute of Earth System Sciences, Section Soil Science, Leibniz University Hannover, Hannover, Germany., Abdollahpour M; Institute of Earth System Sciences, Section Soil Science, Leibniz University Hannover, Hannover, Germany., Sauheitl L; Institute of Earth System Sciences, Section Soil Science, Leibniz University Hannover, Hannover, Germany., Guggenberger G; Institute of Earth System Sciences, Section Soil Science, Leibniz University Hannover, Hannover, Germany., Zamanian K; Institute of Earth System Sciences, Section Soil Science, Leibniz University Hannover, Hannover, Germany.
Πηγή: Global change biology [Glob Chang Biol] 2026 Oct; Vol. 32 (10), pp. e71119.
Τύπος έκδοσης: Journal Article
Γλώσσα: English
Στοιχεία περιοδικού: Publisher: Blackwell Pub Country of Publication: England NLM ID: 9888746 Publication Model: Print Cited Medium: Internet ISSN: 1365-2486 (Electronic) Linking ISSN: 13541013 NLM ISO Abbreviation: Glob Chang Biol Subsets: MEDLINE
Imprint Name(s): Publication: : Oxford : Blackwell Pub.
Original Publication: Oxford, UK : Blackwell Science, 1995-
Ιατρικοί όροι (MeSH): Carbon Dioxide*/analysis , Soil*/chemistry , Carbon Sequestration* , Climate Change*, Forests ; Models, Theoretical ; Seasons ; Agriculture
Περίληψη: Land-surface models commonly assume that soil CO2 production is rapidly transferred out of the soil profile, effectively equating respiration with near-surface signals. However, persistent subsoil CO2 enrichment despite limited in situ production reflects bidirectional exchange of topsoil-respired CO2, suggesting that the surface-centric assumption may not be universally valid. Here we combine year-round, multi-depth field observations with process-based modeling (DeepCO2) to quantify the effects of land use (croplands, forests, and forest-cropland edges) and climate on soil CO2 production-transport dynamics. We reveal pronounced vertical decoupling of soil CO2, with deep CO2 (> 1 m) concentrations up to two orders of magnitude above surface concentrations and 9-17 times greater than can be explained by in situ production alone, revealing profile-scale production-transport imbalance. Forest soils promote ~2.3-fold greater deep CO2 accumulation than cropland and edge systems, driven by enhanced macroporosity and stronger advective coupling. Seasonal climate forcing regulates these regimes, with winter cold spells suppressing exchange, whereas spring-summer warming amplifies CO2 source strength originating from otherwise "protected" subsoil organic carbon, particularly in cropland and edge soils. These findings demonstrate that a substantial fraction of topsoil-respired CO2 is redistributed below the soil-atmosphere boundary and retained within the subsurface, forming a land-use-sensitive CO2-C sink. Surface-based CO2 assessment therefore reflects a transport-limited, boundary-conditioned signal rather than a direct proxy for profile-scale production, and alone cannot resolve the full partitioning of soil-respired carbon. Incorporating depth-dependent production-transport coupling is therefore essential for accurately representing terrestrial carbon allocation and land-climate feedbacks under ongoing land-use change and climate warming.
(© 2026 The Author(s). Global Change Biology published by John Wiley & Sons Ltd.)
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Grant Information: 15-76251-2-Stay-8/22-5947/2022 Niedersächsisches Ministerium für Wissenschaft und Kultur
Contributed Indexing: Keywords: CO2 production; CO2 transport; climate change; hydrological modeling; land use; process modeling (DeepCO2); soil CO2 storage
Substance Nomenclature: 142M471B3J (Carbon Dioxide)
0 (Soil)
Entry Date(s): Date Created: 20260928 Date Completed: 20260928 Latest Revision: 20260930
Update Code: 20260930
PubMed Central ID: PMC13618454
DOI: 10.1111/gcb.71119
PMID: 42803775
Βάση Δεδομένων: MEDLINE
Περιγραφή
ISSN:1365-2486
DOI:10.1111/gcb.71119