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