Differences in nitrogen cycling and soil mineralisation between a eucalypt plantation and a mixed eucalypt and Acacia mangium plantation on a sandy tropical soil

Tchichelle Sogni Viviane, Epron Daniel, Mialoundama Fidèle, Koutika Lydie-Stella, Harmand Jean-Michel, Bouillet Jean-Pierre, Mareschal Louis. 2017. Differences in nitrogen cycling and soil mineralisation between a eucalypt plantation and a mixed eucalypt and Acacia mangium plantation on a sandy tropical soil. Southern Forests, 79 (1) : 1-8.

Quartile : Q3, Sujet : FORESTRY

Résumé : Sustainable wood production requires appropriate management of commercial forest plantations. Establishment of industrial eucalypt plantations on poor sandy soils leads to a high loss of nutrients including nitrogen (N) after wood harvesting. An ecological intensification of eucalypt plantations was tested with the replacement of half of the Eucalyptus urophylla × E. grandis by Acacia mangium in the eucalypt monoculture to sustain soil fertility through enhancement of the N biological cycle. A randomised block design was set up on ferralitic arenosol in the Congolese coastal plains to assess differences in soil N mineralisation, N fluxes in litterfall, and N stocks in forest floor litter and soil between pure acacia (100A), pure eucalypt (100E) and mixed-species treatments (50A50E). Soil N mineralisation was enhanced under acacia, reaching on average 0.17 and 0.15 mg kg−1 soil d−1 in 100A and 50A50E, respectively, compared with 0.09 mg kg−1 soil d−1 in 100E. Higher amounts of N returning to the soil through harvest residues and litterfall were observed under acacia than under eucalypt. However, N stock in mineral soil was not increased in 100A and exhibited a limited increase only in the top soil layer of 50A50E. Our results suggest a much faster N turnover under acacia than under eucalypt. Although A. mangium is an exotic N2-fixing tree in central Africa, it appears to be well adapted to the climatic and edaphic conditions of the Congo, showing an efficient growth strategy. Eucalypt trees could benefit from the increase in soil N availability in mixed-species stands.

Mots-clés Agrovoc : plantation forestière, Eucalyptus urophylla, Eucalyptus grandis, Acacia mangium, culture en mélange, cycle de l'azote, Fixation de l'azote, minéralisation de l'azote, Arénosol, ammonium, arbre fixateur d'azote, croissance, litière forestière, fertilité du sol, nitrate

Mots-clés géographiques Agrovoc : République démocratique du Congo

Mots-clés libres : Ammonium, Arenosol, Congo, Ecological intensification, Forest plantation, Mixed species, N2 fixation, Nitrate

Classification Agris : K10 - Production forestière
F61 - Physiologie végétale - Nutrition
P33 - Chimie et physique du sol
P35 - Fertilité du sol

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

Auteurs et affiliations

• Tchichelle Sogni Viviane, CRDPI (COG)
• Epron Daniel, CIRAD-PERSYST-UMR Eco&Sols (FRA)
• Mialoundama Fidèle, UMNG (COG)
• Koutika Lydie-Stella, CRDPI (COG)
• Harmand Jean-Michel, CIRAD-PERSYST-UMR Eco&Sols (CMR) ORCID: 0000-0002-8065-106X
• Bouillet Jean-Pierre, CIRAD-PERSYST-UMR Eco&Sols (BRA)
• Mareschal Louis, CIRAD-PERSYST-UMR Eco&Sols (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/582197/)

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