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Acta Geochimica

, Volume 36, Issue 3, pp 456–461 | Cite as

Effects of slope position and land use on the stability of aggregate-associated organic carbon in calcareous soils

  • Man Liu
  • Guilin HanEmail author
  • Zichuan Li
  • Taoze Liu
  • Xiaomin Yang
  • Yuntao Wu
  • Zhaoliang SongEmail author
Original Article

Abstract

Topography and land use affect soil organic carbon (SOC) storage, stabilization, and turnover, through several biogeochemical processes. This study investigated the aggregate composition and SOC content of bulk soils and aggregates at different slope positions under different land uses in a typical karst catchment of southwestern China. Our results show that the proportion of macro-aggregates and the SOC content of bulk soils and aggregates at different slope positions decreased from the upper to the lower slope. The SOC content generally increased with an increase in the mean weight diameter and proportion of macro-aggregates under different land uses. Our results indicate that macro-aggregates in forest and grassland soils make a greater contribution to both aggregate composition and SOC content than that in arable land soils. Therefore, converting farmland to forest or grassland can facilitate the accumulation of macro-aggregates as well as the storage of SOC.

Keywords

Soil organic carbon Aggregate fraction Land use Slope position Karst Southwest China 

Notes

Acknowledgements

This work was supported jointly by the National Natural Science Foundation of China (41325010; 41571130042) and the State’s Key Project of Research and Development Plan of China (2016YFA0601002).

Compliance with ethical standards

Conflict of interest

We declare no conflict of interest.

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Copyright information

© Science Press, Institute of Geochemistry, CAS and Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.School of Water Resources and EnvironmentChina University of Geosciences (Beijing)BeijingChina
  2. 2.Institute of the Surface-Earth System ScienceTianjin UniversityTianjinChina
  3. 3.The State Key Laboratory of Environmental Geochemistry, Institute of GeochemistryChinese Academy of SciencesGuiyangChina

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