Adult Tree DBH, Distance, & Condition at York University

Method: On September 23, 2014, our Ecology lab group, led by our teacher assistant Taylor Noble, split up into 3 groups. After walking to the grassland and woodlot area of York University – Keele Campus, each group was responsible for collecting 4 datasets. The grassland and woodlots were still in fairly good condition, given the time of year, and there were many plants and trees to study. Our group members were Jason, Coleen, Leeron, Zainab and Sanaz. The following dataset is for the third dataset collected. In this dataset, a transect was placed on the ground through the woodlot beginning at a random adult tree observed. Adult trees were identified if the height of the tree was approximately twice Sanaz’s height of approximately 160cm. For each adult tree, the distance between the trees and the diameter breast height (dbh) of the trunk were measured in centimeters using a second transect measuring tape. These measurements were taken by the same person and recorded. The condition of each adult tree was also ranked from 0 – 2 by group members, and recorded. If the condition of the tree was dead, it was ranked 0, if it was living, it was ranked 1, and if it had a huge green canopy, it was ranked 2. In total 10 adult trees were observed and the above-mentioned measurements were recorded for each.研究方法：2014年9月23日，由助教泰勒·诺布尔（Taylor Noble）带领的本生态实验室小组分为3组。在步行抵达约克大学基尔校区（York University – Keele Campus）的草原与林地区域后，每组需负责采集4份数据集。结合当时的季节来看，该草原与林地的生态状态仍较为良好，拥有大量可供研究的植物与林木。本组组员包括杰森（Jason）、科琳（Coleen）、利隆（Leeron）、扎伊纳布（Zainab）与萨纳兹（Sanaz）。以下为本次采集的第三份数据集详情。本数据集以林地内一处随机选取的成年乔木为起点，在地面布设样带（transect）。成年乔木的判定标准为树高约为萨纳兹身高（约160cm）的两倍。针对每株成年乔木，使用第二条样带卷尺（transect measuring tape）测量其与起点树的距离，以及树干的胸径（diameter breast height, dbh），测量单位均为厘米。上述测量工作均由同一人完成并记录。此外，小组成员还对每株成年乔木的健康状况进行了0至2级的分级评定并记录：若乔木已死亡则记为0分，存活则记为1分，拥有茂密翠绿的冠层则记为2分。本次共观测到10株成年乔木，并对上述各项测量指标进行了完整记录。