Perimeter and Non-Perimeter Woodlot Maple Trees

The data for “Perimeter and Non-Perimeter Woodlot Maple Trees” was collected over a two-day collection period at the woodlot area at York University-Keele Campus in Toronto Ontario. The first day of data collection took place on Friday October 17, 2014 from 15:00-15:45. Weather conditions included heavy cloud cover, moderately windy conditions and a temperature of approximately 10 degrees Celsius. Researchers wanted to study the relationship between the relative location of adult maple trees in the woodlot area and the canopy abundance during the autumn season. Researchers proceeded to explore additional abiotic variables that may affect the number of leaves remaining on the tree. Alongside to leaf abundance (%) and relative location of the tree, researchers observed and recorded six additional variables, including: tree height, girth of trunk, soil pH, moisture level, canopy exposure to direct sunlight and leaf colour. On the first day of data collection, researchers observed ten randomly selected “perimeter” adult maple trees found along the southern edge of the woodlot area and ten “non-perimeter” adult maple trees. Any maple tree that fell within a 2-metre radius from the outer edge was considered “perimeter” tree, while any maple tree that fell beyond an 8-metre radius from the outer edge was considered “non-perimeter”. The second day of data collection took place on Friday October 24, 2014 from 15:00-15:45. Weather conditions included fairly clear skies, light cloud cover and a temperature of approximately 12 degrees Celsius. On the second day of data collection, researchers observed ten randomly selected “perimeter” adult maple trees found along the northern edge of the woodlot area and ten “non-perimeter” adult maple trees. The same criterion to distinguish perimeter from non-perimeter trees was employed. The same researcher determined the relative height of each tree in all sets of data collection by observation. Simple qualitative descriptions of tree height were recorded for each tree. The girth of each tree at researcher breast-level was measured and recorded using a transect tape for each tree. A simple litmus paper test was employed to measure the pH of the soil immediately surrounding the base of the tree. Soil pH provides an indication of the nutrients and minerals that tree receives in its habitat. A small sample of soil was added to a container filled with distilled water, after which a strip of litmus paper was added. The pH value was obtained by comparing the resulting colour change on the litmus paper to given pH values. The exposure of the main canopy to direct sunlight was observed and recorded as a percentage by the same researcher across all datasets. The moisture level of the soil immediately surrounding the base of the tree was felt by touch and rated on a relative 0-2 scale, where 0 indicated “dry” and 2 indicated “wet”. The overall abundance of leaves on each tree was observed by the same researcher and recorded as a percentage. The leaf colour(s) on each tree were observed and recorded. General descriptions of colour were employed in describing leaf colour. Participating researchers included: Kristina, Naz and Yu.

《林地周边与非周边成年糖枫》数据集的数据采集于加拿大安大略省多伦多市约克大学基尔校区的林地范围内，采集工作为期两天。首次数据采集于2014年10月17日星期五15:00至15:45进行，当日天气为多云密布、风力中等，气温约10摄氏度。研究团队旨在探究该林地内成年糖枫的相对位置与秋季冠层叶量丰度之间的关联，并进一步探索可能影响树木留存叶片数量的非生物变量。除叶片丰度（%）与树木相对位置两项指标外，研究人员还观测并记录了六项额外变量，具体包括：树高、树干胸径、土壤pH值、土壤湿度、冠层直射日照占比，以及叶片颜色。首日采集阶段，研究人员沿林地南部边缘随机选取了10株"周边"成年糖枫与10株"非周边"成年糖枫。周边树木的判定标准为：位于林地外缘2米半径范围内的糖枫；非周边树木则为位于林地外缘8米半径范围以外的糖枫。第二次数据采集于2014年10月24日星期五15:00至15:45进行，当日天气为晴间多云，气温约12摄氏度。当日研究人员沿林地北部边缘随机选取了10株"周边"成年糖枫与10株"非周边"成年糖枫，周边与非周边树木的判定标准与首日保持一致。所有数据采集批次的树高均由同一名研究人员通过目测完成定性描述，并为每株树木记录树高的简易定性说明。树干胸径使用测绳进行测量并记录。土壤pH值采用简易石蕊试纸法测定：采集树木基部周边的少量土壤样本放入盛有蒸馏水的容器中，随后浸入石蕊试纸，通过试纸变色结果与标准pH值比对得到pH数值。冠层主枝接受直射日照的占比由同一名研究人员统一观测并以百分比形式记录。土壤湿度通过触感评估，按照0-2的相对等级划分：0代表"干燥"，2代表"湿润"。每株树木的总叶片丰度由同一名研究人员观测并以百分比形式记录。叶片颜色通过通用颜色描述进行观测与记录。本次参与研究的人员包括：克里斯蒂娜（Kristina）、纳兹（Naz）与于（Yu）。