Floristic composition, structure and diversity of riparian forests in southwestern Nigeria: Conservation is inevitable

The Nigerian riparian forest ecosystems had declined in extent and distribution and this had been attributed mainly to land use change. This study intended to provide an understanding of the links between plant diversity, composition, structures, and disturbances both anthropogenic and natural processes inducing the vegetation dynamics. Nine study sites were used for this study, within each site, five (5) plots (0.25 ha in size) were marked out and placed systematically at an interval of 10 m along the transect. A complete enumeration of plant species was carried out and identified at the species level. Diversity indices and structural parameters were determined and anthropogenic activities were ranked. A total number of 233 plant species were identified, belonging to 80 families; out of which, Euphorbiaceae and Apocynaceae were dominant families The density and basal area ranged from 2,200-6,000 ha-1 and 2.59-17.58 m2 ha-1 respectively across the study sites. Pterocarpus santalinoides,..., Description of the study area: The study was carried out in Osun State located in Southwestern Nigeria. The state lies within latitude 7° 30′ N and longitudes 4° 30′ E. Ilesha West, Atakumosa West, Ife North, Ife North East, Ife South, and Ayedade were the Local Government Areas, where the sites are situated within Osun State, Southwestern Nigeria. Nine riparian forest sites (Ifetedo, Ilesha, Osu, Famia, Ibodi, Tonkere Gbongan, Edunabon, and Ipetumodu) were selected from these Local Government areas and designated as site I-IX respectively. These areas represented riparian zones with flooding patterns of Southwestern Nigeria and have high plant species diversity, despite varying ongoing anthropogenic activities (Figure 1, Table 1). The detailed climate, soil, and vegetation of the study area in Southwestern, Nigeria have been described (Borisade 2020, Borisade and Odiwe2021).
Data Collection
Vegetation Sampling and Data Collection for Plant Species
Woody species assessment: In each comm..., PAleontological STatistics (PAST) version 3.17 software (Hammer et al. 2001).

尼日利亚河岸森林生态系统的面积与分布均已缩减，该现象主要归因于土地利用变化。本研究旨在厘清植物多样性、群落组成、群落结构，以及人为与自然干扰过程与植被动态之间的关联。本研究共设置9个样地，每个样地内以样带法每隔10米系统布设5个面积为0.25公顷的样方。开展了全面的植物物种普查并完成物种水平鉴定，计算了多样性指数与群落结构参数，并对人为活动进行等级划分。本研究共鉴定出233种植物，隶属于80个科，其中大戟科（Euphorbiaceae）与夹竹桃科（Apocynaceae）为优势科。各样地的植株密度与胸高断面积分别介于2200~6000株·公顷⁻¹与2.59~17.58平方米·公顷⁻¹之间。紫檀属（Pterocarpus santalinoides，……）等。
研究区域概况：本研究开展于尼日利亚西南部的奥孙州（Osun State）。该州地处北纬7°30′、东经4°30′范围内。研究样地分布于奥孙州的伊莱沙西区（Ilesha West）、阿塔库莫萨西区（Atakumosa West）、伊费北区（Ife North）、伊费东北区（Ife North East）、伊费南区（Ife South）以及阿耶达德区（Ayedade）共6个地方政府区域。从上述区域中选取9个河岸森林样地，分别为伊费泰迪（Ifetedo）、伊莱沙（Ilesha）、奥苏（Osu）、法米亚（Famia）、伊博迪（Ibodi）、汤克雷-翁博贡（Tonkere Gbongan）、埃杜纳邦（Edunabon）以及伊佩图莫杜（Ipetumodu），依次编号为样地I至IX。这些区域属于尼日利亚西南部的洪水河岸带，尽管存在持续的人为干扰活动，但仍拥有较高的植物物种多样性（图1、表1）。尼日利亚西南部研究区域的详细气候、土壤与植被特征已在既往研究中得到阐述（Borisade 2020；Borisade与Odiwe 2021）。
数据收集
植物物种与植被采样数据收集
木本植物调查：于每个样地内……[原文未完成]。古生物学统计软件（PAleontological STatistics，PAST）版本3.17（Hammer等，2001）。