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Land use effects on erosion and carbon storage of the Río Chimbo watershed, Ecuador

Abstract

Background and aims

Soil carbon storage is an important component of global carbon cycling. Andean Andisols have high carbon content and are vulnerable to erosion because of agricultural intensification and deforestation. This study examines the effects of land use on erosion and soil carbon storage in the Río Chimbo watershed of Ecuador.

Methods

Soil carbon content, age, and erosion estimated from 137Cs inventories was measured along an elevational transect under annual cropping, natural forest, páramo, pasture, and tree plantations.

Results

Land use, particularly annual cropping, affected 137Cs levels in the upper soil layers, but did not have an impact on total carbon storage to a depth of 1 m. Relative erosion rates estimated from 137Cs inventories at sites under annual cropping averaged 27 t ha−1 y−1 over the erosion rate of non-cultivated sites. A linear relationship was observed between soil carbon age (determined by 14C levels) and 137Cs levels, where pasture sites had lower 137Cs and older carbon compared to natural forest sites.

Conclusions

The effects of land use on soil loss in the Río Chimbo watershed suggest a loss and/or removal of soil carbon, particularly under annual cropping.

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Acknowledgements

This study was funded by the US-AID SANREM CRSP Project LTRA-3 Watershed-based Natural Resource Management in Small-scale Agriculture: Sloped Areas of the Andean Region. The authors wish to thank the landowners of the sites studied for granting permission to sample soil from their fields, Thierry Daubenspeck of the Penn State Radiation Science and Engineering Center who conducted the 137Cs analysis, and, Franklin Valverde, Maria Arguello, Pedro Veloz, Victor Barerra, and Carlos Monar for their guidance and suggestions during the sampling campaigns in Ecuador. The authors would also like to acknowledge Stephen Klassen who performed the GIS work and Gerd Dercon who provided helpful suggestions.

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Correspondence to J. P. Lynch.

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Responsible Editor: Johannes Lehmann.

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Henry, A., Mabit, L., Jaramillo, R.E. et al. Land use effects on erosion and carbon storage of the Río Chimbo watershed, Ecuador. Plant Soil 367, 477–491 (2013). https://doi.org/10.1007/s11104-012-1478-y

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  • DOI: https://doi.org/10.1007/s11104-012-1478-y

Keywords

  • Andisol
  • Erosion
  • Land use
  • Soil carbon