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Floristic diversity, regeneration status, and vegetation structure of woodlands in Metema Area, Amhara National Regional State, North-western Ethiopia

查看全文 作　　者：Haile Adamu [1]Wale;Tamrat [2]Bekele;Gemedo [3]Dalle 高影响力作者 机构地区：[1]Ethiopian Institute of Agricultural Research,Debre Zeit Agricultural Research Center,P.O.Box 32,Debre Zeit,Ethiopia;[2]Addis Ababa University,Faculty of Life Sciences,P.O.Box 1176,AddisAbaba,Ethiopia;[3]Institute of Biodiversity Conservation,P.O.Box 80119,Addis Ababa,Ethiopia高影响力机构 出　　处：《Journal of Forestry Research》索引2012年第23卷第3期,共8页高影响力期刊 摘　　要：We studied woodland vegetation in broad-leaved deciduous woodlands of Metema in northwestern Amhara regional state, Ethiopia Our objective was to describe plant species composition, diversity, regeneration status, and population structure by a selective approach with asystematic sampling design. A total of 74 quadrats (each for 25 m × 25 m,spaced at intervals of 150 200 m) were sampled along established transect lines following the homogeneity of the vegetation. Vegetation data including cover-abundance, height, diameter at breast height (DBH), and numbers of seedlings and saplings of woody species were analyzed using Excel spreadsheet, Shannon Weiner diversity index, and PAST version 1.62. A total of 87 vascular plant species of 74 genera and 36 families were recorded. The dominant family was Fabaceae represented by 16(18.39 %) species of 13 genera. Shannon Weiner diversity and evenness were 3.67 and 0.82, respectively, which showed that the area was endowed with rich floral diversity evenly distributed. The vegetation structure, as quantified by cumulative diameter class frequency distribution,plotted as an interrupted inverted-J-shape pattern with a sharp decreasein the 2nd diameter class. This indicated poor vegetation structure. The diameter classes frequency distributions of selected species plotted infour general patterns i.e., interrupted Inverted-J-shape, J-shape,Bell-shape and Irregular-shape. In conclusion, although the area showedhigh floral diversity and evenness, woody species including Sterculea setigera, Boswellia papyrifera, and Pterocarpus lucens showed lowest recruitment of seedlings and saplings. 关 键 词：多样性指数 植被结构 埃塞俄比亚 植物区系 西北部 状态 民族区域 林地
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