RESUMELa caractérisation des enherbements des parcelles agricoles environnant la forêt classée de Sanaimbo a été réalisée à partir de 310 relevés phyto-écologiques. La flore adventice comprend 398 espèces.
ABSTRACT
WEED FLORISTIC DIVERSITY AND INFESTATION DEGREE IN THE FIELDS SURROUNDING SANAIMBO CLASSIFIED FOREST IN THE CENTRE-EASTERN CÔTE D'IVOIRECharacterization of weed communities in the fields surrounding the classified forest of Sanaimbo was done through 310 phyto-ecological plots. The weeds flora is made of 398 species. They are listed according to their frequency and abundance. Quantitative floristic analysis shows that the more frequent species are Chromolaena odorata, Panicum laxum, Pouzolzia guineensis, Solanum erianthum, Lapotea aestuens, Spigelia anthelmia and Mariscus cylindristachyus and the weeds that more cause damage are Chromolaena odorata, Euphorbia heterophylla, Croton hirtus and Ageratum conyzoides. But the most noxious weed is Chromolaena odorata.
A floristic survey of rice agro-ecosystems of Yamoussoukro, Attiégouakro and Didiévi in Côte d'Ivoire. The floristic and phytosociological surveys contribute to an in-depth analysis of major weeds affecting rice growing in agro-ecosystems. These surveys sort out the qualitative and quantitative aspects of flora weeds. As a result, 227 species distributed in 151 genera and 56 families were recorded. The most represented families are Poaceae, Cyperaceae, Asteraceae, Euphorbiaceae, Rubiaceae and Fabaceae. The species inventory helps to reveal 5 major weeds. Regarding the centesimal frequency and abundance-dominance, there are Cyperus difformis L. and Echinochloa crus-galli (L.) P.Beauv. Fimbristylis littoralis Gaudich., Sphenoclea zeylanica Gaertner and Leptochloa caerulescens Steud..
Baobab tree species plays a significant role in the livelihoods of rural dwellers in the Sahel regions. This study was carried out to analyze farmer’s perceptions on the impacts of Adansonia digitata L. leaves exploitation on its conservation and on livelihoods of local communities. Data were collected by interviewing 120 farmers to elucidate the impacts of leaves exploitation as well as the contribution of the species on their livelihoods. Descriptive statistics and multiple regression analysis were used to analyze the data to identify the annual contribution and to determine the socio-demographic characteristics influencing farmer’s perception of baobab leaves harvesting techniques. The results show that non-timber forest products (NTFPs) are the second pillar to support the respondents after agriculture. Their contribution rate ranged between 4 and 7% in the study sites. The findings revealed that the annual income obtained per person from the exploitation of baobab leaves ranged from 33,714 FCFA (56.00 USD) to 52,857 FCFA (87.80 USD). Its contribution to annual household income varies between 2.51 and 5.4%. Two (used of machete and stick) out of the three (manual collection, used of machete and stick) methods used by farmers to harvest the baobab leaves, have negative impacts on baobab species conservation. Age, educational level, and gender are key factors influencing farmer’s perception of baobab leaves harvesting. In view of the importance of the baobab tree, it is imperative that the domestication and propagation of baobab trees should be supported through the adoption of improved agroforestry technologies. In addition, sustainable harvesting practices of baobab leaves is also recommended for the conservation of this species.
Le haricot (Phaseolus vulgaris L.) constitue une source de compléments protéiques pour l'alimentation des populations. Cependant, les mauvaises herbes affectent la productivité de cette légumineuse. Cette étude a pour objectif de caractériser la flore adventice dans les parcelles de haricot. Des inventaires floristiques et des analyses phytosociologiques ont été conduits en 2014 et en 2015 dans des parcelles de haricot localisées dans trois départements de la Côte d'Ivoire. Ainsi, 190 relevés floristiques ont été réalisés permettant de recenser 229 espèces adventices réparties en 157 genres appartenant à 57 familles. Les familles les mieux représentées sont par ordre d'importance les Poaceae (11,35%), les Fabaceae (7,86%), les Asteraceae (7,42%), les Euphorbiaceae (6,97%), les Cyperaceae (3,93%), les Caesalpiniaceae (3,93%) et les Amaranthaceae (3,49%). L'analyse de la fréquence et de l'abondance-dominance des espèces a révélé que Chromolaena odorata (L.) R. M. King et H. Rob. et Croton hirtus l'Hérit. sont les adventices les plus nuisibles dans les parcelles de haricot.
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