Perspective of soil carbon sequestration in Chilean volcanic soils

Matus, Francisco and Salazar, Osvaldo and Aburto, Felipe and Zamorano, Denisse and Francisco, Nájera and Jovanović, Radmila and Guerra, Catalina and Reyes-Rojas, Luis and Seguel, Oscar and Pfeiffer, Marco and Dörner, José and Valle, Susana and Radic-Schilling, Sergio and Duarte, Efrain (2024) Perspective of soil carbon sequestration in Chilean volcanic soils. npj Materials Sustainability, 2:32. ISSN 2948-1775

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Abstract

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.

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