Actual and potential carbon sequestration in topsoils of eastern China
Abstract
Evaluating the current storage of soil organic C (SOC) and its future sequestration potential helps to develop goal-oriented strategies to enlarge the soil C pool. Here, we investigated the contents of particulate and mineral-associated organic C (POC and MAOC) and assessed the C sequestration potentials as stable mineral-associated fractions in 240 triplicated topsoils collected from adjacent woodlands, uplands, and paddies across four climate zones in eastern China. SOC content was generally lower in warmer climates (subtropics and tropics) than in cooler ones (mid- and warm temperate), with a generally descending order of paddies > woodlands > upland croplands in each climate zone. The SOC contents of all soils were dominated by MAOC, whereas with a lesser proportion of MAOC in warmer climates. Compared with woodlands, cropland use reshaped SOC compositions: paddies had larger POC and MAOC pools but with reduced SOC stability, whereas upland croplands had a lower total SOC content yet with higher stability. The average C/N ratios of particulate organic matter were comparable among the three ecosystems and four climates (15 ± 3.4), while those of mineral-associated organic matter were lower in subtropics (10 ± 2.0) than other climatic zones (13 ± 1.7). These differences in the C/N ratios of mineral-associated fractions are explained by the fast organic matter turnover, intensive N fertilization and strong adsorption of N containing organic compounds by Fe/Al oxides in subtropics. Regardless of climate and land-use, MAOC accumulation in all ecosystems was not saturated as assessed by the 95thquantile regression between the mass proportion of the clay + silt fraction and the current MAOC content. Although the average MAOC saturation degrees exceeded 60%, its wide variation within and between individual soils suggested a further substantial C sequestration potential, particularly in the mid-temperate. These findings underscore that SOC management strategies must be tailored to local land-use and climate conditions to raise stable SOC pools.
Details
- Organisationseinheit(en)
-
Institut für Bodenkunde
- Externe Organisation(en)
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Institute of Subtropical Agriculture, Chinese Academy of Sciences
Chinese Academy of Sciences (CAS)
Graduate University of Chinese Academy of Sciences
Hunan Agricultural University
Chinese Academy of Agricultural Sciences
Princess Nourah bint Abdulrahman University
Georg-August-Universität Göttingen
Peoples' Friendship University of Russia (RUDN)
- Typ
- Artikel
- Journal
- Soil and Tillage Research
- Band
- 261
- ISSN
- 0167-1987
- Publikationsdatum
- 05.03.2026
- Publikationsstatus
- Elektronisch veröffentlicht (E-Pub)
- Peer-reviewed
- Ja
- ASJC Scopus Sachgebiete
- Agronomie und Nutzpflanzenwissenschaften, Bodenkunde, Erdoberflächenprozesse
- Ziele für nachhaltige Entwicklung
- SDG 13 - Klimaschutzmaßnahmen, SDG 15 - Lebensraum Land
- Elektronische Version(en)
-
https://doi.org/10.1016/j.still.2026.107157 (Zugang:
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