Diameter and Distance between Saplings and Adult Trees at Osgoode Woodlot

Experiment was conducted in Osgoode Woodlot at York University's Keele campus on September 23rd, 2015. A transect was placed from the edge of the woodlot towards the middle of it. Adult trees 3m or taller within 15m of the transect were surveyed, noting their canopy coverage and diameter at breast height (dbh) in mm. Nearby saplings of the same species were also surveyed, and both their distance from the "parent" tree and dbh were also recorded. The height of the trees was estimated by roughly comparing them with our height - anything at least 1.5x our height was sufficient. Canopy coverage was also estimated by making a square between our fingers and looking skywards. The dbh for each tree was measured using the transect tape, while being careful not to wrap the tape around the tree.本实验于2015年9月23日在约克大学基尔校区的奥斯古德林地（Osgoode Woodlot）内开展。研究人员沿林地边缘向林地内部布设一条样带（transect）。对样带两侧15米范围内、高度达3米及以上的成年树木展开调查，记录其冠层覆盖率（canopy coverage）以及以毫米为单位的胸径（diameter at breast height，dbh）。同时对样地附近同种物种的幼树开展调查，记录其与“母树”的距离以及胸径。树木高度通过与调查人员身高粗略比对估算：高度达到调查人员身高1.5倍及以上的植株即可纳入统计范畴。冠层覆盖率则通过双手手指围成正方形框后仰望天空的方式完成估算。每株树木的胸径均采用样带卷尺测量，测量过程中需注意勿使卷尺缠绕树干。