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RESEARCH ARTICLE

Soil nutrient variation along a shallow catena in Paracou, French Guiana

Leandro Van Langenhove https://orcid.org/0000-0002-9603-5106 A I , Lore T. Verryckt A , Clement Stahl B , Elodie A. Courtois C , Ifigenia Urbina D E , Oriol Grau D E F , Dolores Asensio D E , Guille Peguero A D E , Olga Margalef D E , Vincent Freycon G H , Josep Peñuelas D E and Ivan A. Janssens A
+ Author Affiliations
- Author Affiliations

A Centre of Excellence GCE (Global Change Ecology), Department of Biology, University of Antwerp, Wilrijk, Belgium.

B INRA, UMR Ecology of Guiana Forests (Ecofog), AgroParisTech, Cirad, CNRS, Université de Guyane, Université des Antilles, 97387 Kourou, France.

C Laboratoire Ecologie, Évolution, Interactions des Systèmes amazoniens (LEEISA), Université de Guyane, CNRS, IFREMER, 97300 Cayenne, French Guiana.

D CSIC, Global Ecology Unit CREAF-CSIC-UAB, 08193 Bellaterra, Catalonia, Spain.

E CREAF, Cerdanyola del Vallès, 08193 Catalonia, Spain.

F Cirad, UMR EcoFoG (AgroParisTech, CNRS, INRA, Université de Guyane, Université des Antilles), Campus Agronomique, 97310, Kourou, French Guiana.

G CIRAD, UPR Forêts et Societes, F-34398 Montpellier, France.

H Forêts et Sociétés, Université de Montpellier, CIRAD, Montpellier, France.

I Corresponding author. Email: leandro.vanlangenhove@uantwerpen.be

Soil Research - https://doi.org/10.1071/SR20023
Submitted: 29 January 2020  Accepted: 2 September 2020   Published online: 30 October 2020

Abstract

Tropical forests are generally considered to stand upon nutrient-poor soils, but soil nutrient concentrations and availabilities can vary greatly at local scale due to topographic effects on erosion and water drainage. In this study we physically and chemically characterised the soils of 12 study plots situated along a catena with a shallow slope in a tropical rainforest in French Guiana both during the wet and the dry season to evaluate seasonal differences. Soils along the catena were all Acrisols, but differed strongly in their water drainage flux. Over time, this differential drainage has led to differences in soil texture and mineral composition, affecting the adsorption of various nutrients, most importantly phosphorus. The more clayey soils situated on the slope of the catena had higher total concentrations of carbon, nitrogen, phosphorus and several micronutrients, while extractable nutrient concentrations were highest in the sandiest soils situated at the bottom of the catena. We found that carbon, nitrogen and extractable nutrients all varied seasonally, especially in the surface soil layer. These results are interesting because they show that, even at the local scale, small differences in topography can lead to large heterogeneity in nutrient concentrations, which can have large impacts on plant and microbial community organisation at the landscape level.

Keywords: French Guiana, lowland tropical forest, Paracou, phosphorus, topography, water drainage.


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