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Short-range-order minerals as powerful factors explaining deep soil organic carbon stock distribution: the case of a coffee agroforestry plantation on Andosols in Costa Rica

Item

Title (Dublin Core)

Short-range-order minerals as powerful factors explaining deep soil organic carbon stock distribution: the case of a coffee agroforestry plantation on Andosols in Costa Rica

Description (Dublin Core)

<p>Soil organic carbon (SOC) constitutes the largest
terrestrial C stock, particularly in the Andosols of volcanic areas.
Quantitative information on distribution of SOC stocks is needed to
construct a baseline for studying temporal changes in SOC. The spatial
variation of soil short-range-order minerals such as allophane usually
explains the variability of topsoil SOC contents, but SOC data for deeper
soil layers are needed. We found that within a 1&thinsp;<span class="inline-formula">km<sup>2</sup></span> Costa Rican
basin covered by coffee agroforestry, SOC stocks in the upper 200&thinsp;<span class="inline-formula">cm</span> of soil
were highly variable (24 to 72&thinsp;<span class="inline-formula">kg C m<sup>−2</sup></span>). Topsoil SOC stocks were not
correlated with SOC stocks present in deeper layers. Diffuse-reflectance
mid-infrared (MIR) spectroscopy made possible the analysis of a large number
of samples (69 soil profiles, i.e. 598 soil samples) for ammonium-oxalate and
sodium-pyrophosphate-extractable forms of Al, Fe, and Si, as well as SOC
content and bulk density. Using the MIR spectra, we identified two different
soil materials, which were identified as <i>allophanic</i> and <i>halloysitic</i> soil material. <i>Allophanic</i> soil occurred
on top of the <i>halloysitic</i> soil. The thickness of the <i>allophanic</i> soil material, rich in SRO
minerals and related to a young andic A horizon, explained the variability of
SOC. This study illustrates that knowledge of topography and pedogenesis is
needed to understand and extrapolate the distribution of SOC stocks at
landscape scales.</p>

Creator (Dublin Core)

T. Chevallier
K. Fujisaki
O. Roupsard
F. Guidat
R. Kinoshita
E. de Melo Viginio Filho
P. Lehner
A. Albrecht

Subject (Dublin Core)

Environmental sciences
GE1-350
Geology
QE1-996.5

Publisher (Dublin Core)

Copernicus Publications

Date (Dublin Core)

2019-11-01T00:00:00Z

Type (Dublin Core)

article

Identifier (Dublin Core)

10.5194/soil-5-315-2019
2199-3971
2199-398X
https://doaj.org/article/c982fc7e07d642478da3d72be8e8460f

Source (Dublin Core)

SOIL, Vol 5, Pp 315-332 (2019)

Language (Dublin Core)

EN

Relation (Dublin Core)

https://www.soil-journal.net/5/315/2019/soil-5-315-2019.pdf
https://doaj.org/toc/2199-3971
https://doaj.org/toc/2199-398X

Provenance (Dublin Core)

Journal Licence: CC BY