York University Woodlot Adult Tree DBH, Distance, & Condition

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）带领的生态实验室团队被划分为3个小组。团队步行至约克大学基尔（York University – Keele）校区的草原与林地片区后，每个小组负责采集4组数据集。结合采集时段的季节特征，该草原与林地整体状态良好，拥有丰富的可供研究的植物与林木资源。本次参与采集的小组成员包括杰森（Jason）、科琳（Coleen）、利龙（Leeron）、扎伊纳布（Zainab）与萨纳兹（Sanaz）。下文所述为本次采集的第三组数据集。本数据集的布设方式为：以林地中随机选取的一棵成年乔木为起点，在地面铺设一条样带（transect）。成年乔木的判定标准为树高约为萨纳兹身高（约160厘米）的两倍。针对每棵成年乔木，采用专用样带卷尺，以厘米为单位测量其与样带起点的间距，以及树干的胸径（diameter breast height, DBH）。上述测量工作由同一人完成并如实记录。小组成员同步对每棵成年乔木的健康状况进行0-2级的评级并记录：树木死亡时评级为0，存活时评级为1，树冠茂密翠绿时评级为2。本次共观测到10棵成年乔木，并对前述各项测量与评级指标进行了完整记录。