Abstract

Rattans, one of the major non-timber forest products used by the population in and around Kisangani (Democratic Republic of Congo), are a significant source of income and the basis of a very active informal sector focused towards supplying the city with raw canes. We present the effects of harvest and light availability on the demography of two common rattan species in the Yoko forest reserve, near Kisangani: Eremospatha haullevilleana De Wild. and Laccosperma secundiflorum (P. Beauv.) Kuntze. We studied clump demography for a year, under variable light condition and harvesting regimes (control, partial harvest and complete harvest of adult stems). We show a positive effect of full and partial light availability on the dynamic of individuals for both species but with variable treatment responses. We also demonstrate that a partial harvest of two-thirds of adults cane is beneficial or nondetrimental to the production of new shoots under partial or full-light conditions. These results suggest opportunities for multiple-use management that integrate timber and rattan harvesting in forest around Kisangani. Resume Le rotin, un des principaux produits forestiers non ligneux utilises par la population de Kisangani (Republique Democratique du Congo) et des environs, est une source de revenus importante a la base d'un secteur informel tres dynamique qui se charge de fournir la ville en cannes brutes. Nous presentons ici les effets de la collecte et de la disponibilite en lumiere sur la demographie de deux especes de rotin, Eremospatha haullevilleana De Wild. et Laccosperma secundiflorum (P. Beauv.) Kuntze, communes dans la foret de Yoko, pres de Kisangani. Nous avons etudie la demographie des massifs pendant un an, sous differentes conditions de luminosite et de regimes de recoltes (controle, recolte partielle et collecte complete des plants adultes). Nous montrons qu'il y a un effet positif de la disponibilite totale et partielle de lumiere sur la dynamique des individus dans les deux especes mais avec des reponses variables aux differents traitements. Nous montrons aussi qu'une recolte partielle de 2/3 des cannes adultes est soit profitable, soit non dommageable pour la production de nouvelles pousses en cas de luminosite partielle ou totale. Ces resultats suggerent des possibilites pour une gestion multi-ressources qui integre la collecte de grumes et du rotin dans les forets autour de Kisangani.

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