Woodlot Dataset 3

Method: Group members: Afra, Maham, Farinaz and Sana The purpose of this experiment with respect to Woodlot dataset 3 is to become familiar with sampling tools such as the transect tape and learning techniques for collecting field data such as distance between trees, circumference of trees and subsequently the diameter at breast height and determining tree condition. This data could be used to determine tree conditions near the edge of the woodlot in comparison to the centre of the woodlot. I predict that trees found on the edge of the woodlot receive more sunlight than those found in centre of the woodlot. Thus, I hypothesize that the adult trees near the edge of the woodlot would possess healthier and non decaying bark and a large canopy (abundant leaves) whereas adult trees located closer to the centre of the woodlot would possess decaying bark and a smaller canopy. Data collection for Woodlot dataset 3 took place at the Northwest corner of York University's Keele campus in a Woodlot on September 26, 2014 from 3:00pm to 4:00pm by Sana Jamal and Maham Anees. Sana both recorded and took measurements while, Maham solely took the measurements. At the time of data collection, it was sunny with very little cloud cover and wind. The temperature at this time was about 23 degrees Celsius. The transect tape was placed on the ground at the edge of the woodlot and extended approximately 30 meters in a straight line to centre of the woodlot. One adult tree was selected at random from the edge of the woodlot and subsequent adult trees were selected along the transect tape placed on the ground. Overall, 10 pairs of adult trees were selected giving a total of 20 trees. The distance between a pair of adult trees was measured in centimeter using a transect tape where each distance measurement was taken from the base of each tree. The diameter at breast height (dbh) of each tree was determine by measuring the circumference of each adult tree in centimeter using a transect tape and applying the formula, diameter= circumference/ π. Lastly, the condition of the tree was determined by visually observing the tree with the eyes. The condition of the tree was based on a scale where, 0 = dead , 1 = living, 2 = huge green canopy.实验组成员：Afra、Maham、Farinaz与Sana。本实验针对Woodlot数据集3开展，旨在熟悉样带卷尺（transect tape）等野外采样工具，掌握树木间距、树干周长等野外数据采集技术，进而推算胸高直径（diameter at breast height，DBH）并评估树木健康状况。本实验采集的数据可用于对比林缘与林内核心区域的树木生长状况。本研究预判林缘树木可获得比林内树木更多的光照，据此提出假说：林缘成年树木的树皮更为健康且无腐朽，树冠茂密（叶片繁茂）；而靠近林内中心的成年树木则树皮存在腐朽问题，树冠相对狭小。Woodlot数据集3的数据采集工作于2014年9月26日15:00至16:00，在约克大学（York University）基尔校区（Keele Campus）西北角的林地内完成，由Sana Jamal与Maham Anees负责实施。其中Sana同时承担数据记录与测量工作，Maham仅负责测量环节。采集当日天气晴朗，云量稀少且风力微弱，气温约为23摄氏度。实验人员将样带卷尺沿林缘地面铺设，以直线延伸至林内中心，总长度约30米。首先从林缘随机选取1株成年树木，随后沿铺设完成的样带依次选取成年树木，最终共选取10组配对样本，总计20株成年树木。以厘米为单位，利用样带卷尺测量每对树木基部之间的间距。通过测量每株成年树木的树干周长（单位：厘米），结合公式「直径=周长/π」，计算得到每株树木的胸高直径（DBH）。最后通过目视观察评估树木健康状况，评估标准如下：0代表死亡，1代表存活，2代表树冠茂密翠绿。