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Soil organic carbon sequestration in soil aggregates in the karst Critical Zone Observatory, Southwest China

Author

Listed:
  • Man Liu

    (Instituteof Earth Sciences, China University of Geosciences, Beijing, P.R. China)

  • Guilin Han

    (Instituteof Earth Sciences, China University of Geosciences, Beijing, P.R. China)

  • Zichuan Li

    (Instituteof Surface-Earth System Science, Tianjin University, Tianjin, P.R. China)

  • Qian Zhang

    (School of Water Resources and Environment, China University of Geosciences, Beijing, P.R. China)

  • Zhaoliang Song

    (Instituteof Surface-Earth System Science, Tianjin University, Tianjin, P.R. China)

Abstract

Soil organic carbon (SOC) sequestration in aggregates under land use change have been widely concerned due to intimate impacts on the sink (or source) of atmospheric carbon dioxide (CO2). However, the quantitative relationship between soil aggregation and SOC sequestration under land uses change has been poorly studied. Distribution of aggregates, SOC contents in bulk soils and different size aggregates and their contributions to SOC sequestration were determined under different land uses in the Puding Karst Ecosystem Observation and Research Station, karst Critical Zone Observatory (CZO), Southwest China. Soil aggregation and SOC sequestration increased in the processes of farmland abandonment and recovery. SOC contents in micro-aggregates were larger than those in macro-aggregates in restored land soils, while the opposite results in farmland soils were obtained, probably due to the hindrance of the C-enriched SOC transport from macro-aggregate into micro-aggregate by the disturbance of agricultural activities. SOC contents in macro-aggregates exponentially increased with their proportions along successional land uses. Macro-aggregates accounted for over 80% on the SOC sequestration in restored land soils, while they accounted for 31-60% in farmland soils. These results indicated that macro-aggregates have a great potential for SOC sequestration in karst soils.

Suggested Citation

  • Man Liu & Guilin Han & Zichuan Li & Qian Zhang & Zhaoliang Song, 2019. "Soil organic carbon sequestration in soil aggregates in the karst Critical Zone Observatory, Southwest China," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 65(5), pages 253-259.
    • Handle: RePEc:caa:jnlpse:v:65:y:2019:i:5:id:602-2018-pse
    DOI: 10.17221/602/2018-PSE
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    References listed on IDEAS

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    1. F.Z. Zhao & X.H. Han & G.H. Yang & Y.Z. Feng & G.X. Ren, 2014. "Soil structure and carbon distribution in subsoil affected by vegetation restoration," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 60(1), pages 21-26.
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