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Legacy of logging roads in the Congo Basin: How persistent are the scars in forest cover?

Kleinschroth Fritz, Gourlet-Fleury Sylvie, Sist Plinio, Mortier Frédéric, Healey John R.. 2015. Legacy of logging roads in the Congo Basin: How persistent are the scars in forest cover?. Ecosphere, 6 (4):64, 17 p.

Journal article ; Article de recherche ; Article de revue à facteur d'impact Revue en libre accès total
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Quartile : Q2, Sujet : ECOLOGY

Abstract : Logging roads in the Congo Basin are often associated with forest degradation through fragmentation and access for other land uses. However, in concessions managed for timber production, secondary roads are usually closed after exploitation and are expected to disappear subsequently. Little is known about the effectiveness of this prescription and the factors affecting vegetation recovery rate on abandoned logging roads. In a novel approach we assessed logging roads as temporary elements in the forest landscape that vary in persistence depending on environmental conditions. We analyzed road persistence during the period 1986–2013 in adjacent parts of Cameroon, Central African Republic and Republic of Congo. Three successive phases of road recovery were identified on LANDSAT images: open roads with bare soil, roads in the process of revegetation after abandonment and disappeared roads no longer distinguishable from the surrounding forest. Field based inventories confirmed significant differences between all three categories in density and richness of woody species and cover of dominant herbs. We used dead-end road segments, built for timber exploitation, as sampling units. Only 6% of them were identified as being re-opened. Survival analyses showed median persistence of four years for open roads before changing to the revegetating state and 20 years for revegetating roads before disappearance. Persistence of revegetating roads was 25% longer on geologically poor substrates which might result from slower forest recovery in areas with lower levels of soil nutrient content. We highlight the contrast amongst forests growing on different types of substrate in their potential for ecosystem recovery over time after roads have been abandoned. Forest management plans need to take these constraints into account. Logging activities should be concentrated on the existing road network and sites of low soil resource levels should be spared from business-as-usual exploitation. (Résumé d'auteur)

Mots-clés Agrovoc : Forêt tropicale humide, Abattage d'arbres, Route forestière, Impact sur l'environnement, dégradation des forêts, Déboisement, Restauration couverture végétale, Fertilité du sol, Reconstitution forestière, Régénération naturelle, Couverture végétale, Télédétection, Exploitation forestière

Mots-clés géographiques Agrovoc : Afrique centrale, Cameroun, République démocratique du Congo, République centrafricaine

Mots-clés libres : Central Africa, GIS, LANDSAT, Deforestation, Geological substrate, Land cover change, Land sharing–Land sparing, Regeneration, Road ecology, Selective logging, Survival analysis, Tropical rain forest

Classification Agris : K70 - Forest injuries and protection
K10 - Forestry production
J12 - Handling, transport, storage and protection of forest products
U30 - Research methods

Champ stratégique Cirad : Axe 6 (2014-2018) - Sociétés, natures et territoires

Agence(s) de financement européenne(s) : European Commission

Auteurs et affiliations

  • Kleinschroth Fritz, CIRAD-ES-UPR BSef (FRA)
  • Gourlet-Fleury Sylvie, CIRAD-ES-UPR BSef (FRA) ORCID: 0000-0002-1136-4307
  • Sist Plinio, CIRAD-ES-UPR BSef (FRA)
  • Mortier Frédéric, CIRAD-ES-UPR BSef (FRA)
  • Healey John R., Bangor University (GBR)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/577452/)

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