Shifts in organic carbon protection mechanism in agricultural soils across climatic gradients

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • Chong Ma
  • Yinhang Xia
  • Yichao Rui
  • Wei Gao
  • Xun Duan
  • Hang Qiao
  • Xunyang He
  • Yajun Hu
  • Daoyou Huang
  • Jinshui Wu
  • Yirong Su
  • Georg Guggenberger
  • Xiangbi Chen

Organisationseinheiten

Externe Organisationen

  • Institute of Subtropical Agriculture, Chinese Academy of Sciences
  • Graduate University of Chinese Academy of Sciences
  • Hunan Agricultural University
  • Purdue University
  • Shandong University
Forschungs-netzwerk anzeigen

Details

OriginalspracheEnglisch
Aufsatznummer109184
Seitenumfang10
FachzeitschriftAgriculture, Ecosystems and Environment
Jahrgang375
Frühes Online-Datum30 Juli 2024
PublikationsstatusElektronisch veröffentlicht (E-Pub) - 30 Juli 2024

Abstract

The persistence of carbon (C) in soils strongly depends on its biophysiochemical formation pathways. However, the contributions of physical, chemical and microbial processes to organic C accrual across various landscapes and climates remain unclear. In this study, we employed a combination of physical fractionation and biomarker analysis to investigate soil organic C subjected to microbial anabolism and protected by aggregates and free minerals in typical agricultural lands across a climatic gradient across eastern China. Results showed that the proportion of aggregate-protected C in total C decreased progressively from mid-temperate (62 %) to tropical regions (20 %), while free mineral-associated C increased from 24 % to 58 %. This suggests a shift from aggregate protection as the primary pathway for soil organic C formation in cooler climates to a mineralogical association in warmer climates. Compared to free minerals, the stronger C acquisition in aggregates was characterized by greater occluded mineral-associated C probably due to the enriched reactive minerals and cations. However, less microbial-derived C detected in aggregates than in free minerlas (especially in warmer climates) because of spatial isolation. The enhanced soil organic C preservation in paddy fields compared to adjacent uplands was attributed to the strengthened microaggregate formation and increased C sequestration capacity of free minerals induced by long-term flooding conditions. To enhance C storage in agricultural soils, it is crucial to adopt strategies such as improving aggregation, strengthening microbial anabolism in cooler regions, and incorporating calcium-enriched inorganic amendments in warmer climates.

ASJC Scopus Sachgebiete

Zitieren

Shifts in organic carbon protection mechanism in agricultural soils across climatic gradients. / Ma, Chong; Xia, Yinhang; Rui, Yichao et al.
in: Agriculture, Ecosystems and Environment, Jahrgang 375, 109184, 01.11.2024.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Ma, C., Xia, Y., Rui, Y., Gao, W., Duan, X., Qiao, H., He, X., Hu, Y., Huang, D., Wu, J., Su, Y., Guggenberger, G., & Chen, X. (2024). Shifts in organic carbon protection mechanism in agricultural soils across climatic gradients. Agriculture, Ecosystems and Environment, 375, Artikel 109184. Vorabveröffentlichung online. https://doi.org/10.1016/j.agee.2024.109184
Ma C, Xia Y, Rui Y, Gao W, Duan X, Qiao H et al. Shifts in organic carbon protection mechanism in agricultural soils across climatic gradients. Agriculture, Ecosystems and Environment. 2024 Nov 1;375:109184. Epub 2024 Jul 30. doi: 10.1016/j.agee.2024.109184
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abstract = "The persistence of carbon (C) in soils strongly depends on its biophysiochemical formation pathways. However, the contributions of physical, chemical and microbial processes to organic C accrual across various landscapes and climates remain unclear. In this study, we employed a combination of physical fractionation and biomarker analysis to investigate soil organic C subjected to microbial anabolism and protected by aggregates and free minerals in typical agricultural lands across a climatic gradient across eastern China. Results showed that the proportion of aggregate-protected C in total C decreased progressively from mid-temperate (62 %) to tropical regions (20 %), while free mineral-associated C increased from 24 % to 58 %. This suggests a shift from aggregate protection as the primary pathway for soil organic C formation in cooler climates to a mineralogical association in warmer climates. Compared to free minerals, the stronger C acquisition in aggregates was characterized by greater occluded mineral-associated C probably due to the enriched reactive minerals and cations. However, less microbial-derived C detected in aggregates than in free minerlas (especially in warmer climates) because of spatial isolation. The enhanced soil organic C preservation in paddy fields compared to adjacent uplands was attributed to the strengthened microaggregate formation and increased C sequestration capacity of free minerals induced by long-term flooding conditions. To enhance C storage in agricultural soils, it is crucial to adopt strategies such as improving aggregation, strengthening microbial anabolism in cooler regions, and incorporating calcium-enriched inorganic amendments in warmer climates.",
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author = "Chong Ma and Yinhang Xia and Yichao Rui and Wei Gao and Xun Duan and Hang Qiao and Xunyang He and Yajun Hu and Daoyou Huang and Jinshui Wu and Yirong Su and Georg Guggenberger and Xiangbi Chen",
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T1 - Shifts in organic carbon protection mechanism in agricultural soils across climatic gradients

AU - Ma, Chong

AU - Xia, Yinhang

AU - Rui, Yichao

AU - Gao, Wei

AU - Duan, Xun

AU - Qiao, Hang

AU - He, Xunyang

AU - Hu, Yajun

AU - Huang, Daoyou

AU - Wu, Jinshui

AU - Su, Yirong

AU - Guggenberger, Georg

AU - Chen, Xiangbi

N1 - Publisher Copyright: © 2024 Elsevier B.V.

PY - 2024/7/30

Y1 - 2024/7/30

N2 - The persistence of carbon (C) in soils strongly depends on its biophysiochemical formation pathways. However, the contributions of physical, chemical and microbial processes to organic C accrual across various landscapes and climates remain unclear. In this study, we employed a combination of physical fractionation and biomarker analysis to investigate soil organic C subjected to microbial anabolism and protected by aggregates and free minerals in typical agricultural lands across a climatic gradient across eastern China. Results showed that the proportion of aggregate-protected C in total C decreased progressively from mid-temperate (62 %) to tropical regions (20 %), while free mineral-associated C increased from 24 % to 58 %. This suggests a shift from aggregate protection as the primary pathway for soil organic C formation in cooler climates to a mineralogical association in warmer climates. Compared to free minerals, the stronger C acquisition in aggregates was characterized by greater occluded mineral-associated C probably due to the enriched reactive minerals and cations. However, less microbial-derived C detected in aggregates than in free minerlas (especially in warmer climates) because of spatial isolation. The enhanced soil organic C preservation in paddy fields compared to adjacent uplands was attributed to the strengthened microaggregate formation and increased C sequestration capacity of free minerals induced by long-term flooding conditions. To enhance C storage in agricultural soils, it is crucial to adopt strategies such as improving aggregation, strengthening microbial anabolism in cooler regions, and incorporating calcium-enriched inorganic amendments in warmer climates.

AB - The persistence of carbon (C) in soils strongly depends on its biophysiochemical formation pathways. However, the contributions of physical, chemical and microbial processes to organic C accrual across various landscapes and climates remain unclear. In this study, we employed a combination of physical fractionation and biomarker analysis to investigate soil organic C subjected to microbial anabolism and protected by aggregates and free minerals in typical agricultural lands across a climatic gradient across eastern China. Results showed that the proportion of aggregate-protected C in total C decreased progressively from mid-temperate (62 %) to tropical regions (20 %), while free mineral-associated C increased from 24 % to 58 %. This suggests a shift from aggregate protection as the primary pathway for soil organic C formation in cooler climates to a mineralogical association in warmer climates. Compared to free minerals, the stronger C acquisition in aggregates was characterized by greater occluded mineral-associated C probably due to the enriched reactive minerals and cations. However, less microbial-derived C detected in aggregates than in free minerlas (especially in warmer climates) because of spatial isolation. The enhanced soil organic C preservation in paddy fields compared to adjacent uplands was attributed to the strengthened microaggregate formation and increased C sequestration capacity of free minerals induced by long-term flooding conditions. To enhance C storage in agricultural soils, it is crucial to adopt strategies such as improving aggregation, strengthening microbial anabolism in cooler regions, and incorporating calcium-enriched inorganic amendments in warmer climates.

KW - Aggregate-protected C

KW - Agricultural lands

KW - Microbial residues

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JO - Agriculture, Ecosystems and Environment

JF - Agriculture, Ecosystems and Environment

SN - 0167-8809

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ER -

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