138 research outputs found

    Diospyro-Kyayetlia Senegalensis ord. nov. in the regional "Parc W" of river Niger

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    Les vĂ©gĂ©tations arbustives des voisinages des cours d’eau ont Ă©tĂ© Ă©tudiĂ©es Ă  partir de 34 relevĂ©s phytosociologiques rĂ©alisĂ©s entre septembre 2001 et dĂ©cembre 2003, en utilisant la mĂ©thode phytosociologique de Braun Blanquet. Deux associations vĂ©gĂ©tales en sont dĂ©crites: Feretio-Khayetum senegalensis et Celtido-Diospyroetum mespiliformis. Une alliance nouvelle et un ordre nouveau sont crĂ©Ă©s pour les regrouper. Il s’agit du Feretio-Khayion senegalensis et du Diospyro-Khayetalia senegalensis. Cet ordre rassemble les groupements vallicoles de la zone de transition soudano sahĂ©lienne et est considĂ©rĂ© comme vicariante gĂ©ographique du Pterygotetalia Lebrun et Gilbert 1954. Aussi, le Diospyro-Khayion senegalensis all. nov est consirĂ©dĂ©rĂ© comme vicariante gĂ©ographique du Khayo-Pterygotion Schmitz 1950 et du Psychotrio-Tecleion Schmitz 1971. Mots clĂ©s: Diospyro-Khayetalia senegalensis, Diospyro-Khayion senegalensis, Parc RĂ©gional du W du fleuve NigerThe shrubby vegetation close to water bodies was documented and analysed by 34 phytosciological observations, beginning September 2001 to December 2003; the Braun Blanquet phytoecological method was used. Two vegetative associations were depicted: Feretio-Khayetum senegalensis and Celtido-Diospyroetum mespiliformis. To regroup them, a new alliance and a new order were created. They consisted of Feretio-Khayion senegalensis and Diospyro-Kyayetalia senegalensis. This order assembled the in valley groupings of the transitional sudano sahelian zone and was considered as a geographic variance of Pterygotetalia Lebrun and Gilbert 1954. As well as the Diospyro-Khayion senegalensis all. nova was considered as a geographic variance of Khayo-Pterygotion Schmitz 1950 and of Psychotrio-Tecleion Schmitz 1971. Key words: Diospyro-Khayetalia senegalensis, Diospyro-Khayion senegalensis, W Regional Park of Niger Rive

    Diospyro-Khayetalia senegalensis ord. nov. dans le Parc RĂ©gional du W du fleuve Niger

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    The shrubby vegetation close to water bodies was documented and analysed by 34 phytosciological observations, beginning September 2001 to December 2003; the Braun Blanquet phytoecological method was used. Two vegetative associations were depicted: Feretio-Khayetum senegalensis and Celtido-Diospyroetum mespiliformis. To regroup them, a new alliance and a new order were created. They consisted of Feretio-Khayion senegalensis and Diospyro-Kyayetalia senegalensis. This order assembled the in valley groupings of the transitional sudano sahelian zone and was considered as a geographic variance of Pterygotetalia Lebrun and Gilbert 1954. As well as the Diospyro-Khayion senegalensis all. nova was considered as a geographic variance of Khayo-Pterygotion Schmitz 1950 and of Psychotrio-Tecleion Schmitz 1971.Les vĂ©gĂ©tations arbustives des voisinages des cours d’eau ont Ă©tĂ© Ă©tudiĂ©es Ă  partir de 34 relevĂ©s phytosociologiques rĂ©alisĂ©s entre septembre 2001 et dĂ©cembre 2003, en utilisant la mĂ©thode phytosociologique de Braun Blanquet. Deux associations vĂ©gĂ©tales en sont dĂ©crites: Feretio-Khayetum senegalensis et Celtido-Diospyroetum mespiliformis. Une alliance nouvelle et un ordre nouveau sont crĂ©Ă©s pour les regrouper. Il s’agit du Feretio-Khayion senegalensis et du Diospyro-Khayetalia senegalensis. Cet ordre rassemble les groupements vallicoles de la zone de transition soudano sahĂ©lienne et est considĂ©rĂ© comme vicariante gĂ©ographique du Pterygotetalia Lebrun et Gilbert 1954. Aussi, le Diospyro-Khayion senegalensis all. nov est consirĂ©dĂ©rĂ© comme vicariante gĂ©ographique du Khayo-Pterygotion Schmitz 1950 et du Psychotrio-Tecleion Schmitz 1971

    Photometry of the Didymos System across the DART Impact Apparition

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    On 2022 September 26, the Double Asteroid Redirection Test (DART) spacecraft impacted Dimorphos, the satellite of binary near-Earth asteroid (65803) Didymos. This demonstrated the efficacy of a kinetic impactor for planetary defense by changing the orbital period of Dimorphos by 33 minutes. Measuring the period change relied heavily on a coordinated campaign of lightcurve photometry designed to detect mutual events (occultations and eclipses) as a direct probe of the satellite’s orbital period. A total of 28 telescopes contributed 224 individual lightcurves during the impact apparition from 2022 July to 2023 February. We focus here on decomposable lightcurves, i.e., those from which mutual events could be extracted. We describe our process of lightcurve decomposition and use that to release the full data set for future analysis. We leverage these data to place constraints on the postimpact evolution of ejecta. The measured depths of mutual events relative to models showed that the ejecta became optically thin within the first ∌1 day after impact and then faded with a decay time of about 25 days. The bulk magnitude of the system showed that ejecta no longer contributed measurable brightness enhancement after about 20 days postimpact. This bulk photometric behavior was not well represented by an HG photometric model. An HG 1 G 2 model did fit the data well across a wide range of phase angles. Lastly, we note the presence of an ejecta tail through at least 2023 March. Its persistence implied ongoing escape of ejecta from the system many months after DART impact

    Biologie végétale

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    SYL-003001 = Volume 1PHAR1, PHAR2, BIOL-J-102info:eu-repo/semantics/published

    Initiation Ă  l'agronomie

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    SYL-8463 = Fascicule 1AGRO1 - AGRO024info:eu-repo/semantics/published

    JachÚres, produits de cueillette et biodiversité

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    La diversitĂ© des produits de cueillette Banque de donnĂ©es des produits de cueillette Au cours de la derniĂšre dĂ©cennie, de nombreuses enquĂȘtes locales ont Ă©tĂ© menĂ©es dans le cadre du programme jachĂšres en vue de cerner l’utilisation des plantes de la jachĂšre. Dans la synthĂšse qu’ils ont prĂ©parĂ©e dans le cadre de ce programme, Alexandre et KaĂŻrĂ© (2001) ont recensĂ© les principaux travaux menĂ©s jusqu’à prĂ©sent sur les produits forestiers non ligneux (PFNL) des jachĂšres du Sud-Cameroun (Zapfack et..
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