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Effects of remnant trees in fallows on diversity and structure of forest regrowth in a slash-and-burn agricultural system in southern Cameroon

Published online by Cambridge University Press:  26 March 2002

Stéphanie M. Carrière
Affiliation:
Centre d'Ecologie Fonctionnelle et Evolutive (CEFE), UPR CNRS 8481, 1919 Rte de Mende, 34293 Montpellier Cedex 05, France Avenir des Peuples des Forêts Tropicales (APFT), S/C S. Bahuchet, European Commission, DG VIII, 43, rue Cuvier, 75005 Paris, France
Philippe Letourmy
Affiliation:
Centre de coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), Department Ca (Applied Mathematics), Avenue Agropolis, BP 5035, 34032 Montpellier Cedex 1, France
Doyle B. McKey
Affiliation:
Centre d'Ecologie Fonctionnelle et Evolutive (CEFE), UPR CNRS 8481, 1919 Rte de Mende, 34293 Montpellier Cedex 05, France Avenir des Peuples des Forêts Tropicales (APFT), S/C S. Bahuchet, European Commission, DG VIII, 43, rue Cuvier, 75005 Paris, France

Abstract

Remnant trees in fields may facilitate regeneration in fallows by attracting seed dispersers and creating favourable sites for plant establishment. Ntumu shifting cultivators in Cameroon clearing rain forest spare some trees to provide shade for crops. This study examines their effects on regeneration by comparing vegetation in quadrats beneath and away from their crowns, in fallows of varying age (3-20 y). For fallows of all age classes, plant diversity was not significantly different between positions. Trees accounted for larger proportions of species and stems beneath remnant trees. Herbs, principally large monocots, accounted for larger proportions away from trees. Basal area was much higher in quadrats beneath trees. In all quadrats, the majority of individuals belonged to species with animal-dispersed seeds. These accounted for a larger proportion of individuals beneath trees (75%) than away (64%). Wind-dispersed species accounted for a larger proportion of stems away from trees (23.6%) than beneath (11.7%). These data suggest that enhanced seed rain by attraction of perching animals, demonstrated in a companion study, nfluenced regeneration patterns. Effects on regeneration were similar beneath trees of an animal-dispersed (Pycnanthus angolensis, Myristicaceae) and a wind-dispersed (Triplochiton scleroxylon, Sterculiaceae) species. Remnant trees in fallows may facilitate succession by nucleation, resulting in more rapid restoration of forest and conservation of nutrients in plant biomass.

Type
Research Article
Copyright
2002 Cambridge University Press

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