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Carbon Mineralization Controls in Top- and Subsoil Horizons of Two Andisols Under Temperate Old-Growth Rain Forest

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Abstract

The effect of mineral properties on soil organic carbon (SOC) destabilization processes is poorly known. Andisols developed under temperate old-growth rain forest store important amounts of SOC due to strong mineral adsorption capacity. We evaluated the effect of mineral soil properties on microbial activity and native SOC mineralization in an incubation experiment with and without the addition of labile organic carbon (C) and nutrients. Top- and subsoil horizons of two Andisols with contrasting age from temperate old-growth rain forest were sampled. We used the selective dissolution methods to determine the metals complexed with SOC and allophane content. Radiocarbon analysis activity was performed to determine the 14C activity and 14C ages of all soils as a proxy for SOC persistence. Additionally, we carried out a laboratory incubation under controlled conditions with and without 13C labeled cellulose and nutrient solution (NH4NO3, KH2PO4) addition. A lower microbial activity in the subsoils of both Andisols compared to topsoils in accordance with the lower 14C activity at depth was recorded. After cellulose and nutrient additions, both subsoils horizons showed native SOC mineralization after 80 days of incubation. In contrast, these amendments did not induce native SOC mineralization in topsoils showing differences on C turnover rates between top- and subsoil horizons. In both soils, the native SOC mineralization after labile C and nutrient additions was negatively related to Na-pyrophosphate extractable C and may therefore be controlled by the formation of organo-mineral complexes with increasing soil C age. We conclude that the physicochemical soil characteristics evolving during pedogenesis control the SOC stabilization and also destabilization processes in Andisols developed under temperate old-growth rain forests.

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Acknowledgments

The first author thanks the Paris Soil organic matter Group at Thiverval-Grignon, France. We thank Dr. Sébastien Fontaine for his great support in the experimental methodology of the study. We thank also Cyril Girardin and Gerard Bardoux for technical support. Finally, our recognition to Noelia Sepúlveda and Carmen Albornoz for their support in the laboratory at Universidad de La Frontera, Temuco. The first author also thanks MECESUP and CONICYT scholarship program for financial support during the doctorate program. The last author thanks FONDECYT for financial support under the MEC project.

Funding

The authors want to thanks to FONDECYT project N° 1080065 and 1130193 for the financial support to this study. We also acknowledge to ECOSSUD-CONICYT C08U01 for their financial support between the French and the Chilean research groups.

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Correspondence to Rodrigo Neculman.

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The authors declare that they have no conflict of interest.

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Neculman, R., Matus, F., Godoy, R. et al. Carbon Mineralization Controls in Top- and Subsoil Horizons of Two Andisols Under Temperate Old-Growth Rain Forest. J Soil Sci Plant Nutr 21, 780–790 (2021). https://doi.org/10.1007/s42729-020-00400-0

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  • DOI: https://doi.org/10.1007/s42729-020-00400-0

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