The abundance and distributional (in)equalities of forageable street tree resources in Lagos Metropolis, Nigeria

Foraging for wild resources links urban citizens to nature and biodiversity while providing resources important for local livelihoods and culture. However, the abundance and distributional (in)equity of forageable urban tree resources have rarely been examined. Consequently, this study assessed the abundance of forageable street trees and their distribution in Lagos metropolis, Nigeria. During a survey of 32 randomly selected wards across 16 local government areas (LGAs) in the metropolis, 4,017 street trees from 46 species were enumerated. The LGA with the highest number of street trees was Ikeja, with 818 trees, while Lagos Island had the lowest count, with two trees. This disparity in tree numbers could be attributed to variations in human population density within each LGA. Ninety-four percent of the street trees surveyed had at least one documented use and 76 % had two, and thus were potentially forageable. However, the most common species had relatively low forageability scores. O..., All 16 LGAs were chosen and two wards from each LGA were randomly sampled, resulting in a total of 32 wards. Street trees were defined as \"trees located in or near roads or streets\" (Thomsen et al. 2016) for the purpose of this research. The road network dataset for Nigeria, which includes main roads, was obtained from the OpenStreetMap data and prepared by the World Food Programme (WFP) following the United Nations Spatial Data Infrastructure standards. This dataset was used to count and identify all trees on both sides of every street in the selected wards. The size, or basal diameter, of trees on the left side of the street was subsequently measured. The location of each tree was recorded using a handheld Garmin GPS 64x device. Furthermore, the usability ratings (edible, medicinal, and other uses) of the surveyed species were recorded based on the information provided by the “Useful Tropical Plants Database” (https://tropical.theferns.info/). The edible and medicinal usability rating..., , # The abundance and distributional (in)equalities of forageable street tree resources in Lagos Metropolis, Nigeria

[https://doi.org/10.5061/dryad.pzgmsbcwf](https://doi.org/10.5061/dryad.pzgmsbcwf)

## Description of the data and file structure

The data contains street tree data in the Lagos metropolis. Thirty-two wards (32) were selected in Lagos Metropolis. Each worksheet was labeled by the ward name, making 32 worksheets in the Excel workbook. 

Each Worksheet represents:

S/N – the serial number of species surveyed in a particular ward

Family – this is the family the species belongs to

Latin name – this represents the scientific name or full name of the species. Genus and specific epithet

Common name - this is the name known to the general public

BC (cm) - means basal circumference, the measurement of a tree at 4.5ft above the ground

Pi = 3.142

BA (cm) - means basal diameter, calculated by dividing the BC by Pi

ud - represents an unidentifiable stem

野生资源采撷可使城市市民亲近自然与生物多样性，同时为当地生计与文化提供重要支撑。然而，可采撷城市乔木资源的丰度与分布公平性（失衡问题）却鲜有研究关注。为此，本研究针对尼日利亚拉各斯都会区可采撷行道树的丰度及其分布特征展开评估。

本次调查覆盖都会区16个地方政府区域（Local Government Areas, LGAs）内随机选取的32个选区，共记录46个物种的4017株行道树。行道树数量最多的LGA为伊凯贾（Ikeja），共计818株；数量最少的为拉各斯岛（Lagos Island），仅2株。这种数量差异可归因于各LGA间的人口密度差异。本次调查的行道树中，94%至少具备1种已记录的用途，76%具备2种及以上用途，因此具备潜在可采撷价值。然而，优势常见物种的可采撷性评分相对较低。[原文此处存在文本截断]，本研究共纳入全部16个LGA，每个LGA随机抽取2个选区，最终合计32个选区。本研究中将行道树定义为“位于道路或街道周边的乔木”（Thomsen等，2016）。

尼日利亚道路网络数据集（含主干道）取自开放街道地图（OpenStreetMap）数据，并由世界粮食计划署（World Food Programme, WFP）依据联合国空间数据基础设施标准完成预处理。本数据集被用于统计并识别选定选区各街道两侧的所有乔木。随后测量了街道左侧乔木的基径尺寸。每株乔木的位置均通过手持Garmin GPS 64x设备记录。此外，本研究基于“热带有用植物数据库”（https://tropical.theferns.info/）中的信息，记录了受访物种的可用性评级（可食用、药用及其他用途）。可食用与药用可用性评级……

# 尼日利亚拉各斯都会区可采撷行道树资源的丰度与分布公平性（失衡）

[https://doi.org/10.5061/dryad.pzgmsbcwf](https://doi.org/10.5061/dryad.pzgmsbcwf)

## 数据与文件结构说明
本数据集包含拉各斯都会区的行道树数据。研究共在拉各斯都会区选取32个选区。Excel工作簿内共包含32个工作表，每个工作表以对应选区名称命名。

每个工作表包含以下字段：
S/N：特定选区受访物种的序列号
Family：物种所属的科
Latin name：物种的科学学名，包含属名与种加词
Common name：大众通用的俗名
BC (cm)：基周长（basal circumference），即距地面4.5英尺处的树干周长
Pi = 3.142
BA (cm)：基径（basal diameter），通过基周长除以圆周率计算得到
ud：代表无法识别的树干