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Mineral protection mediates soil carbon temperature sensitivity of nine old-growth temperate forests across the latitude transect.

Authors :
Tan C
Wang C
Zhou T
Pang X
Zhao K
Zhou Z
Source :
The Science of the total environment [Sci Total Environ] 2024 May 15; Vol. 925, pp. 171754. Date of Electronic Publication: 2024 Mar 15.
Publication Year :
2024

Abstract

Temperature sensitivity (Q <subscript>10</subscript> ) of soil microbial respiration serves as a crucial indicator for assessing the response of soil organic carbon (SOC) to global warming. However, the biogeographic variation in Q <subscript>10</subscript> remains inconsistent. In this study, we examined Q <subscript>10</subscript> and its potential drivers in nine old-growth mixed broad-leaved Korean pine (Pinus koraiensis Sieb. et Zucc.) forests (the climax community of Asian temperate mixed forest) under a wide range of climatic conditions. We found that stand characteristics (arbuscular mycorrhizal tree basal area to ectomycorrhizal tree basal area ratio and root to shoot ratio) contributed to soil C sequestration by facilitating the accumulation of soil recalcitrant C components. Contrary to the C quality-temperature hypothesis, Q <subscript>10</subscript> was not correlated with C quality (soil C to nitrogen ratio and recalcitrant C to labile C ratio). Soil mineral protection parameters (Fe/Al oxides) had negative effect on Q <subscript>10</subscript> because they inhibited microbial activities by decreasing substrate accessibility. Additionally, soils with high microbial biomass C and microbial biomass C to soil organic C ratio had high Q <subscript>10</subscript> . Overall, understanding the complex relationships among Q <subscript>10</subscript> , mineral protection, and microbial attributes on a spatial scale is essential for accurately predicting soil C cycling in forest ecosystems.<br />Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br /> (Copyright © 2024 Elsevier B.V. All rights reserved.)

Details

Language :
English
ISSN :
1879-1026
Volume :
925
Database :
MEDLINE
Journal :
The Science of the total environment
Publication Type :
Academic Journal
Accession number :
38494010
Full Text :
https://doi.org/10.1016/j.scitotenv.2024.171754