Population Distribution and Condition of Trees at Danby Woods

Measuring tape was to only tool for this experiment; in addition, to a data sheet as shown in Wood-Distance excel sheet. The tape was used to measure the distance between a pair of adult trees. This process was applied for ten pairs of trees. Each pair was given a number and each tree in that pair was given either letters (a or b). After recording the distance, the circumference of each tree (a and b) was recorded by picturing the tree trunk as a circle and we are acquired to measure half of the exterior surface of that circle at a breast height of an individual. From the circumference, we were able to obtain on dbh (diameter at breast height) of each tree by using the OnlineConversion.com*. Further, the conditions of the sampled trees were recorded as 1 dead, 2 living, 3 healthy and big (explained more in the metadata). This research was done at York University in Danby Woods. The data was collected during the fall season of 2014. The measurements took 25 minutes for 10 pairs of trees. *The OnlineConversion.com: http://www.onlineconversion.com/circlesolve.htm Or by using this equation: (Circumference*0.3183)

本次实验仅以卷尺作为唯一工具，另辅以Wood-Distance Excel表格中所示的数据记录表。卷尺用于测量成对成年树木之间的间距，该测量流程共覆盖10组树木对。每组树木对均分配有唯一编号，组内每棵树木分别标记为字母a或b。记录两组树木的间距后，需将树干近似为圆形，于胸高位置测量该圆周外表面的半周长，以此记录每棵树木（a与b）的周长。通过OnlineConversion.com*，可由测得的周长计算得到每棵树木的胸径（diameter at breast height，DBH）。此外，需记录采样树木的生长状态：1代表枯立木，2代表存活木，3代表健康且健壮木（详细说明参见元数据（metadata））。本研究于约克大学（York University）丹比森林（Danby Woods）开展，数据采集工作于2014年秋季完成。10组树木对的全部测量工作共计耗时25分钟。*OnlineConversion.com：http://www.onlineconversion.com/circlesolve.htm，或通过以下公式计算：（周长 × 0.3183）