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Title: Vascular Plants Diversity and Ethnobotany with Emphasis to Traditional Medicinal and Wild Edible Plants in Dugda Dawa District of Borana Zone, Oromia Regional State, Ethiopia
???metadata.dc.contributor.*???: Prof. Zemede Asfaw
Prof. Ensermu Kelbessa
Ashagre, Mersha
Keywords: Dugda Dawa District;Ethnobotany;Medicinal Plants;Plant Diversity;Wild Edible Plants
Issue Date: Apr-2017
Publisher: Addis Ababa University
Abstract: This research is aimed at documentation and analysis of plant diversity in Dugda Dawa District along with the ethnobotanical knowledge associated with traditional medicinal and wild edible plants used by the local people. Vegetation data were collected from 60 plots laid preferentially, 20 m x 20 m for trees and shrubs and 1m x 1m subplots for herbs. Woody species with a diameter at breast height (DBH) > 3 cm were counted and cover abundance values estimated. Shannon-Wiener diversity index was used to assess species richness and evenness. Both Sorensen's similarity coefficient and Jaccardʼs index of similarity were used to measure similarities among communities in Dugda Dawa District vegetation, and only Sorensen's similarity coefficient to measure between this and other woodland vegetations types in Ethiopia. A hierarchical cluster analysis with PC-ORD was used to identify plant communities and synoptic values for detection of the dominant species for naming each plant community type. Frequency, density, DBH, basal area and importance value indices (IVI) of woody species were also computed. Ethnobotanical data were collected by interviewing 392 informants (290 males and 102 females). Guided field walk and discussion (group or individual discussion) were used in collecting the data.Quantitative approaches were used to determine informant consensus factor (ICF), fidelity level (FL), and use value (UV). Ethnomedicinal knowledge apprehended by different informant categories was compared using t-tests with R- software. The study area yielded 343 vascular plant species of which 12 were endemic and four were new records for the floristic region belonging to 227 genera and 81 families. The vegetation was classified into four community types, namely Prunus africana -Calpurnia aurea, Ehretia cymosa - Juniperus procera, Boscia mossambicensis - Lannea schimperi and Celtis africana - Podocarpus falcatus community types based on hierarchical cluster analysis. The overall Shannon- Wiener diversity and evenness values of Dugda Dawa District vegetation were 4.87 and 0.54 respectively. The percentage distribution of individual shrub and tree species across different DBH classes indicated relatively high proportion (53.9%) of individuals in DBH class 3 - 10 cm. Four representative woody plant population structures were identified. Results of the ethnobotanical study revealed 127 medicinal plant species in 123 genera and 82 fanilies; and 71 wild edible plant species belonging to 52 genera and 37 families in different vegetation formations of the study area. The family Fabaceae with 10 (7.9%) species of medicinal and 7 (9.9%) species of wild edibles was dominant followed by the Lamiaceae (7, 5.5%) species of medicinal plants and Anacardiaceae ( 7, 9.9%) species of wild edibles were the families represented by more species in the district. Plants in which leaves are used as medicine and fruits are used as wild food were more dominant (36.6% and 65.4% respectively) than other plant parts in the district. Significant difference (P < 0.05) was seen in the mean number of medicinal plants reported by informants in different age classes, education levels, and experiences. Similarly significant difference (P < 0.05) was observed in the mean number of wild edible plants reported by informants in different age classes and experiences. The highest ICF value (0.93) was recorded for human musculoskeletal and nervous system disease category. The highest fidelity level values were recorded for Ocimum urticifolium (97%) and Cyphostema serpens (97%). Dry evergreen afro-montane forest vegetation which encompasses community one, two and four in Dugda Dawa District is under great anthropogenic pressure including selective cutting of big trees in community four,medicinal plants (e.g. Prunus africana and Zanthoxylum chalybeum) as well as wild edible plants (e.g. Cordia africana and Syzygium guineense) which need strict conservation measures. Thus, priority conservation action should be given to the dry afromontane vegetation type which encompasses plant communities one, two, and four as they contain high plant species number (295) and high useful species (214) though the other vegetation types are also under threat and community - based conservation activities should be applied to create sustainable usage of resources. Warburgia ugandensis and Psophocarpus grandiflorus should be given cultivation and chemical analysis priority for their medicinal and food values respectively.
Description: A Thesis Submitted to The Department of Plant Biology and Biodiversity Management Presented in Fulfillment of the Requirements for the Degree of Doctor of Philosophy (Plant Biology and Biodiversity Management)
Appears in Collections:Thesis-Plant Biology and Biodiversity Management

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