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RESEARCH ARTICLE

Characterization of soil organic carbon at profile scale in two forest soils under pine and holm oak

A. P. Fernández-Getino García https://orcid.org/0000-0003-4044-0505 A *
+ Author Affiliations
- Author Affiliations

A Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, INIA-CSIC, Ctra. A Coruña, km 7.5, Madrid 28040, Spain.

* Correspondence to: fgetino@inia.csic.es

Handling Editor: Siobhan Staunton

Soil Research 62, SR24051 https://doi.org/10.1071/SR24051
Submitted: 14 April 2024  Accepted: 11 October 2024  Published: 31 October 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context

It is essential to promote soil carbon sequestration as a means to mitigate climate change. Thus, it is fundamental to know the distribution of C in the soil at profile scale, the characteristics of humic substances as indicators of soil organic matter (SOM) turnover and their relationship with other soil properties.

Aims

Two forest ecosystems under pine and holm oak developed under a Meso-Mediterranean climate in Spain were used to characterize SOM through the complete sequence of layers of the soil profile.

Methods

General soil analysis, infrared spectroscopic analysis and soil color measurements were conducted for the characterization.

Key results

Humus form under oak was found to be Mull mesotrophic–Mull acid while humus under pine Moder oligotrophic. The infrared spectrum determined that oxidation of the humic acids was more complete in the deeper horizons. Relationships between intensities of the main spectral bands in both soils followed similar maximum and minimum sequence values. The total humic extract (THE) color measured by reflection was found inversely related to the THE color measured by transmission. In the same way, the color spectrum between 350 and 800 nm in the THE showed an inverse relation between hue/brightness and absorbance values.

Conclusions

Infrared analysis and color measurements provided evidence of a different level of stabilization of humic substances from each soil, and between the different horizons. Large spatial variability in soil organic carbon quantity and quality was observed.

Implications

Better understanding of carbon sequestration behavior in different soil ecosystems in its crucial role within the global carbon cycle

Keywords: color by reflection, color by transmission, humic extract, humic substance, humification index, organic matter turnover, soil profile.

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