Sherafu Zinab, Egigu Meseret C, J M Sasikumar
Haramaya University School of Biological Sciences and Biotechnology, P.O. Box 138, Dire Dawa, Ethiopia.
Scientifica (Cairo). 2024 Sep 9;2024:7414375. doi: 10.1155/2024/7414375. eCollection 2024.
Floristic composition, population structure, and regeneration status of woody species of Dabal forest found in East Hararghe zone of Oromia Regional State, Ethiopia, were studied. Vegetation data were obtained from 52 main plots of 20 × 20 m for mature woody species and 5 subplots of 5 × 5 m for seedlings and saplings. Density and dbh of each live woody plant species found in each sample plot were recorded. Frequency, basal area, importance value, and Shannon-Wiener diversity indices were also computed. Totally 59 woody plant species distributed in 33 families were documented. Of these, 45.80, 44.10, and 5.08% were shrubs, trees, and lianas, respectively. Species diversity and evenness indices were 3.56 and 0.87, respectively. Stem count of all woody species was 3379 stems ha. Out of this, 44.6, 30.8, and 24.59% were seedlings (dbh <3.5 cm), saplings (dbh between 3.5 and 10 cm), and mature (dbh >10 cm) individuals, respectively. Total basal area of all individuals with dbh ≥3.5 cm was 29.88 m ha. , , , , , , , , and were species with top ten IVI. Most of these species were top densest, dominant, and frequent. Analysis of population structure based on pooled densities of all species in each dbh class showed that density of seedling > sapling > mature individuals, signifying healthy population structure with good natural regeneration potential. On individual basis, however, 35.6 and 8.5% of species showed fair and poor regeneration statuses, respectively, that deserve attention for conservation.
对埃塞俄比亚奥罗米亚州东部哈勒尔盖地区发现的达巴尔森林木本植物的植物区系组成、种群结构和更新状况进行了研究。植被数据来自52个20×20米的主要样地，用于成熟木本植物，以及5个5×5米的小样地，用于幼苗和幼树。记录了每个样地中发现的每种活木本植物的密度和胸径。还计算了频率、断面积、重要值和香农-威纳多样性指数。共记录了分布在33个科的59种木本植物。其中，灌木、乔木和藤本植物分别占45.80%、44.10%和5.08%。物种多样性和均匀度指数分别为3.56和0.87。所有木本物种的茎数为3379株/公顷。其中，幼苗（胸径<3.5厘米）、幼树（胸径在3.5至10厘米之间）和成熟个体（胸径>10厘米）分别占44.6%、30.8%和24.59%。胸径≥3.5厘米的所有个体的总断面积为29.88平方米/公顷。 、 、 、 、 、 、 、 和 是重要值前十的物种。这些物种大多是密度最高、优势度最高和出现频率最高的。基于每个胸径类中所有物种的合并密度对种群结构进行分析表明，幼苗密度>幼树密度>成熟个体密度，这表明种群结构健康，具有良好的自然更新潜力。然而，就个体而言，分别有35.6%和8.5%的物种更新状况一般和较差，值得在保护方面予以关注。
