Analyse Phytoécologique de la Flore Ligneuse de la Haute Sangha (République du Congo)

Adansonia

Victor Kimpouni¹  Ernest Apani¹  Marcel Motom¹ 

关键词: Republic of Congo;    floristic diversity;    ecological indices;    Guineo-Congolian region;    High Sangha;    phytoecology;    République du Congo;    diversité floristique;    indices écologiques;    région Guinéo-Congolaise;    Haute Sangha;    phytoécologie;   

DOI  :  10.5252/a2013n1a9

学科分类：植物学

来源: Museum National d Histoire Naturelle

【 摘 要 】

PhytoecologicalanalysisofthewoodyfloraofHighSangha(RepublicofCongo).ThefloraoftheHighSangha,justlikethatofCongoasawhole,developsinthecorridorofthe“SanghaRiver”ofGuineo-Congolianarea.Stillbadlyknown,itisstudiedaccordingtoaNorth-easternSouth-westernfloristicgradient,correspondingtoaphytogeographicaldistributionextendingfromtheAtlanticelement(Nigero-Cameroono-Gabonese)totheCameroono-Congoleseelement.OnbothsideoftheSanghaRiver,thesurfaceofstudyissubdividedinthreesectorswhosecentralzoneisthefloristicjunctionbetweenSouth-westandtheNorth-East.Theinventoryoftheindividualsofdbh≥10cmcounts387speciesofwhich12marktheSouth-westernsector,18fortheNorth-easternsectorandsixforthecentralsector.Theverticaldistributiondistinguishesthreelayersfromunequalimportance,ofwhichthepercentageofspeciesoscillatesfrom24to42%.Floristicdiversity,interpretedbytheindicesofbiologicaldiversityofShannon(6.51à7.89)andSimpson(0.96à0.99),ofthecorrelationsofsimilarityofJaccard(31to38%)andofSørensen(62to76%)authenticatesthefloristicchangethroughoutgradientofstudy,withoutanydominanceoftaxa.TheweakestindicesofbiologicaldiversitycharacterizetheCentralsector.Thefloristiccompositionofthethreesectors,concomitantly,showsareductioninthenumberofindividualsforcertainspecies,andconcerningsomeothersanextinctionoftheirsurfaceofdistribution,asapproachingormovingawayfromtheSanghaRiver.Theecologicalcharacteristicsoftheflorashow77%ofsarcochoresand88%ofmesophylles.Theecologicalvalenceandtheabundance-dominanceratioshowthat72%ofspeciesareubiquistsandtheirdensityliesbetweenthreeandfiveindividuals/ha.

【 授权许可】

Unknown