Atsbha Tesfay, Desta Anteneh Belayneh, Zewdu Tessema
Tigray Agricultural Research Institute, Alamata Agriculture Research Centre, Alamata, Ethiopia.
School of Biological Sciences and Biotechnology, Collage of Natural and Computational Sciences, Haramaya University, Ethiopia.
Heliyon. 2019 Jan 7;5(1):e01120. doi: 10.1016/j.heliyon.2019.e01120. eCollection 2019 Jan.
The study was conducted at Gra-Kahsu protected natural vegetation (PNV) and communal grazing land (CGL), in order to evaluate the conservation impact level. The diversity of plant species, population structure of woody species, and regeneration status were analysed from 62 quadrats, each with 20 m × 20 m for trees and 5 m × 5 m for shrubs, using systematic sampling methods. A total of 64 vascular plant species belonging to 52 genera and 37 families from PNV and 43 plant species belonging to 34 genera and 25 families from CGL was identified. Shannon diversity index values of PNV and CGL were 2.29 and 1.84, respectively. The mean basal area of PNV and CGL were 8.29 and 5.32 m/ha, respectively. Three community types from PNV and two from CGL were identified. The population structure of woody species based on diameter and height class distribution showed reflected reversed J-shape for PNV however, bell-shaped, and interrupted inverted J-shape for CGL. The regeneration status of PNV and CGL were considered as good (sapling > seedling > matures) and fair (mature > sapling > seedling), respectively. Therefore, the floristic analysis of these two adjacent land use systems located in similar landscape showed distinctive variation in floristic composition, diversity, and regeneration status, which could be taken as the best practice of restoration and rehabilitation programs like, area exclosure.
该研究在格拉 - 卡苏自然保护区植被（PNV）和公共放牧地（CGL）进行，以评估保护影响水平。采用系统抽样方法，从62个样方分析了植物物种多样性、木本物种的种群结构和更新状况，其中树木样方为20米×20米，灌木样方为5米×5米。共鉴定出PNV的64种维管束植物，隶属于52属37科，以及CGL的43种植物，隶属于34属25科。PNV和CGL的香农多样性指数值分别为2.29和1.84。PNV和CGL的平均断面积分别为8.29和5.32平方米/公顷。确定了PNV的三种群落类型和CGL的两种群落类型。基于直径和高度等级分布的木本物种种群结构显示，PNV呈倒J形，而CGL呈钟形和间断倒J形。PNV和CGL的更新状况分别被认为良好（幼树>幼苗>成熟树）和一般（成熟树>幼树>幼苗）。因此，对这两个位于相似景观中的相邻土地利用系统进行的植物区系分析表明，在植物区系组成、多样性和更新状况方面存在明显差异，这可作为诸如区域封禁等恢复和修复计划的最佳实践。
