Perspective of soil carbon sequestration in Chilean volcanic soils
We analysed a large dataset consisting of 457 soil profiles of Andisols and Ultisols of volcanic origin compared to 60 non-volcanic soils. We hypothesised that soil pH has a greater impact on the development of Al-organomineral complexes in volcanic soils compared to non-volcanic soils, in the latter, the silt and clay fractions play a crucial role. Soil pH >4.5 strongly influenced the formation of Al-organomineral complexes in volcanic soils, while an increase in allophane content led to a decrease in SOC. Ultisols with more crystalline clays, such as halloysite and disordered kaolinite, the pH had a weaker impact and there was no effect on non-volcanic soils. Instead, a positive correlation (R2 = 0.63, p < 0.01) was found between silt and clay and SOC in non-volcanic soils, supporting our second hypothesis. Soil pH played a significant role in the interplay between Al-organomineral complexes and allophane formation, while crystalline mineralogy has a direct effect on SOC levels in non-volcanic soils.
Authors
- Denisse Zamorano (ORCID: https://orcid.org/0000-0002-2981-2112)
- Susana Valle (ORCID: https://orcid.org/0000-0002-9599-0080)
- Efraín Duarte (ORCID: https://orcid.org/0000-0003-3977-1024)
- Óscar Seguel (ORCID: https://orcid.org/0000-0001-7040-3604)
- Francisco Nájera (ORCID: https://orcid.org/0000-0002-1635-5514)
- José Dörner (ORCID: https://orcid.org/0000-0003-4016-2875)
- Francisco Matus (ORCID: https://orcid.org/0000-0002-0534-2208)
- Marco Pfeiffer (ORCID: https://orcid.org/0000-0002-5543-5277)
- Osvaldo Salazar (ORCID: https://orcid.org/0000-0002-3284-3817)
- Felipe Aburto (ORCID: https://orcid.org/0000-0001-9472-930X)
- Sergio Radic‐Schilling (ORCID: https://orcid.org/0000-0003-1812-9235)
- Radmila Jovanović
- Luis Reyes-Rojas
- Ciro Guerra
Institutions
- Universidad de La Frontera (CL)
- Pontificia Universidad Católica de Chile (CL)
- Austral University of Chile (CL)
- University of Concepción (CL)
- Institute of Agricultural Economics Belgrade (RS)
- Universidad de Magallanes (CL)
- University of Chile (CL)
- Washington State University (US)
- Universidad de Málaga (ES)
- Texas A&M University (US)
Publication Details
- Journal
- npj Materials Sustainability
- Published
- 2024-09-13
- DOI
- https://doi.org/10.1038/s44296-024-00038-4
- Citations
- 8
- Primary Topic
- Soil Carbon and Nitrogen Dynamics
- Type
- article
- Field-Weighted Citation Impact
- 2.67
Funders
- U.S. Department of Agriculture
- Max-Planck-Gesellschaft
- Agencia Nacional de Investigación y Desarrollo
- National Institute of Food and Agriculture
- Comisión Nacional de Investigación Científica y Tecnológica