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)

本实验的唯一测量工具为卷尺，辅以如Wood-Distance Excel表格所示的数据记录表。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。每组树木对均被赋予唯一编号，组内每棵树木分别标记为字母(a或b)。记录间距后，需将树干近似为圆形，测量其胸高处外周长的一半，以此获取每棵树木的周长。通过OnlineConversion.com*网站，可由周长计算得到每棵树木的胸径（DBH，diameter at breast height）；亦可通过公式：(周长×0.3183) 完成计算。此外需记录采样树木的状态：1代表枯亡树木，2代表存活树木，3代表健康且长势健壮的树木（详细说明见元数据）。本研究于2014年秋季在约克大学丹比林地开展。10组树木对的测量工作共耗时25分钟。*OnlineConversion.com：http://www.onlineconversion.com/circlesolve.htm