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Life Strategy Traits of the Liana Sericostachys scandens Spreading in the Montane Forests in the Kahuzi-Biega National Park (DR Congo)

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Journal of Mountain Science 2012年第5期9卷 665-675页

作者： Masumbuko Ndabaga Céphas Herpigny Basile Barbier Nicolas Habiyaremye Muhashy Franois lejoly jean Meerts Pierre Université Officielle de Bukavu PoBox 570 Bukavu DR Congo Laboratoire d'Ecologie Végétale et Biogéochimie CP 244 Université Libre de Bruxelles Av FD Roosevelt 50 B-1050 Bruxelles Belgium Botany and Computational Plant Architecture IRD - Marie Curie. 34398 Montpellier cedex 5 France Institut Royal des Sciences Naturelles de Belgique Rue Vautier 29 1000 Bruxelles Belgium Herbarium de l'Université Libre de Bruxelles 50 Avenue F. Roosevelt - CP 169 B-1050 Bruxelles Belgium

Sericostachys scandens is a monocarpic and heliophilous liana, native in tropical African forests. In the montane forests of the Kahuzi-Biega National Park (KBNP) (East of DR Congo), it has been expanding very strongly for a decade, and is currently considered as having negative impacts on biodiversity conservation. In this paper, we test if S. scandens differs from three co-occurring, native, non spreading lianas (Gouania longispicata, Tacazzea apiculata and Adenia bequaertii) for functional traits which might influence plant expansion. For leaf traits (SLA, dry matter content, nitrogen concentration), S. scandens did not show extreme values compared to those of the three other lianas. In contrast, S. scandens had much higher biomass allocation to sexual reproduction. It also differs from the three other lianas for its reproductive strategy that combines both vegetative propagation and sexual reproduction, and propagule dispersal by wind. Moreover, S. scandens has larger leaves and a greater number of lateral branches per unit stem length. It is argued that the particular combination of functional traits exhibited by *** may in part explain its propensity to behave as an opportunistic weed in the disturbed areas in the montane forests of Kahuzi-Biega.

关键词：刚果民主共和国山地森林国家公园叶性状传播藤本植物生活有性繁殖

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Fine-scale habitats influence tree species assemblage in a miombo forest

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Journal of Plant Ecology 2017年第6期10卷 958-969页

作者： Jonathan Ilunga Muledi David Bauman Thomas Drouet Jason Vleminckx Arnaud Jacobs jean lejoly Pierre Meerts Mylor Ngoy Shutcha Ecologie Restauration Ecologique et PaysageFacultédes Sciences AgronomiquesUniversitéde LubumbashiRoute Kasapa BP 1825The Democratic Republic of the Congo Laboratoire d’Écologie Végétale et Biogéochimie(EvB) CP244Facultédes SciencesUniversitéLibre de Bruxelles50 av.F.D.RooseveltBrussels 1050Belgium Service d’Évolution Biologique etÉcologie CP160/12Facultédes SciencesUniversitéLibre de Bruxelles50 av.F.D.RooseveltBrussels 1050Belgium Herbarium de l’UniversitéLibre de Bruxelles(BRLU) Facultédes SciencesUniversitéLibre de BruxellesCP26550 av.F.D.RooseveltBrussels 1050Belgium

Aims Relationships between local habitat heterogeneity and tree commu-nities in miombo woodlands have been very little *** some studies have addressed this topic at broad scales and based on few environmental parameters,this study aims at(i)detecting fine-scale habitats(≤10 ha)on the basis of a detailed characterisation of soil explicitly considering past anthropogenic disturbances,and an exhaustive census of the tree community,and at(ii)searching for indicator tree species corresponding to the resulting *** The study was carried out in the miombo woodland of Mikembo Forest Reserve,Upper Katanga,The Democratic Republic of the congo.A complete census of the tree community was conducted in a 10-ha forest dynamics plot comprising 160 adjacent quadrats of 25×25 m,with a total of 4604 trees(diameter at breast height>10 cm).Thirty-six physicochemical soil parameters were *** the frequency distribution of soil charcoal content allowed identifying local signature of past human agriculture in the *** strategies were used to define habitats:(i)a combination of principal component analysis(PcA)on soil variables and Ward clustering and(ii)multivariate regression trees(MRT)to search for key soil parameters allowing the best prediction of species ***-habitat associations were tested by means of a robust statistical framework combining the IndVal index and torus *** Findings The forest contained 82 tree species and a significant proportion of wet miombo species(*** macroura).We detected a strong east-west edaphic gradient driven by soil texture;most chemical soil parameters followed this *** habitats were identified based on soil factors and floristic *** indicator species of these habitats were *** key soil fac-tors discriminating habitats were total calcium,available forms of phosphorus and clay *** though past agricultural practices were successfully detect

关键词： forest dynamics plot indicator species miombo multivariate regression trees(MRT) soil torus randomisation

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