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Soil P availability under eucalypt and acacia on Ferralic Arenosols, republic of the Congo

Koutika Lydie-Stella, Mareschal Louis, Epron Daniel. 2016. Soil P availability under eucalypt and acacia on Ferralic Arenosols, republic of the Congo. Geoderma Regional, 7 (2) : pp. 153-158.

Journal article ; Article de revue à facteur d'impact
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Abstract : Introducing nitrogen fixing species (NFS) in forest plantations reduces soil N-limitation, but also involves changes in phosphorus (P) availability in the Ferralitic Arenosols of the Congolese coastal plains or Batéké Plateaux in Central Africa. We evaluated soil-available P and total P in above-ground litters, leaves, bark and wood in pure (100A, 100E) and mixed-species (50A50E) stands of acacia (a NFS) and eucalypt plantations in the Congolese coastal plains at year 2 of the second rotation (Y2R2) compared to the end of the first 7-year rotation (EndR1). Soil available P was measured as resin P, bicarbonate-extractable inorganic (Pi-HCO3) and organic (Po-HCO3). Soil resin-P values (15–19 mg P kg− 1) in 100E were 80% higher relative to 100A (8–17 mg P kg− 1) at Y2R2 against no difference for both 100E and 100A (8–12 mg P kg− 1) at EndR1. Total P concentration was higher in acacia wood (0.61 g P kg− 1 of dry mass (DM)) than in eucalypt wood (0.57 g P kg− 1 of DM) in 50A50E at Y2R2, while higher stock of P and higher ratio of N:P ratios were found in the foliage of acacia than of eucalypt trees. Our data suggests that the risk of shifting from N-limitation to P-limitation system is minor. However, in the long term, P-limitation may eventually occur in pure acacia plantations, due to mining of soil available P by acacia's higher P uptake relative to eucalypt and additional requirement for symbiotic fixation of atmospheric N2. (Résumé d'auteur)

Mots-clés Agrovoc : Plantation forestière, Acacia mangium, Eucalyptus grandis, Eucalyptus urophylla, Fixation de l'azote, Phosphore, Teneur en éléments minéraux, Litière forestière, Culture en mélange, Acrisol, Résine, Plaine côtière

Mots-clés géographiques Agrovoc : République démocratique du Congo

Mots-clés libres : Soil resin P, Pi-HCO3, Nutrient poor soil, Mixed species plantation, Congolese coastal plains

Classification Agris : K10 - Forestry production
F61 - Plant physiology - Nutrition
P35 - Soil fertility

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

  • Koutika Lydie-Stella, CIRAD-PERSYST-UMR Eco&Sols (FRA)
  • Mareschal Louis, CIRAD-PERSYST-UMR Eco&Sols (COG)
  • Epron Daniel, CIRAD-PERSYST-UMR Eco&Sols (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/580513/)

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