Lab 2 Plant Observation.

Transects measuring tape was used to record the diameter of 10 randomly selected trees of the same species in the wood at York university. The weather was clear and the sun was shiny and a perfect day to go out and study the environment. The study started approximately at 3:00 pm on Monday. The woods were covered with different types of trees so only one species was picked (probably the most common one) and 10 random trees of that species were. Diameter of the trees were measured and recorded. The species of the tree studied is either Elm or willow. Once the diameter of the randomly selected adult tree was measured, I looked for a sapling of the same species nearby, the distance between the adult tree and the sapling was measured (which should be near the adult tree) and the observations were recorded. After measuring the distance between the sapling and the adult tree , the diameter of the sapling was taken using the measuring tape (usually it is tiny compared to that of the adult tree). All observations were recorded. For the coverage of the adult tree, I used a camera to take a still image of the tree (is was the equivalent of making a square with the fingers. Then I looked at the picture and estimated how much sky I saw. Its was decided that too much of the sky means the leaves coverage. After writing down all the observations percentages were estimated. Branches of the trees were shook whenever I faced a problem locating its leaves since most of the trees are entangled to each other. It was made sure that all description of study site and recordable environment condions and the time of the day were written down.本研究采用样带卷尺对约克大学林地内随机选取的10株同树种树木的直径进行记录。当日天气晴朗、光照充足，是开展野外环境调研的理想时段。本次调研于周一下午约3点启动。该林地内生长有多种树木，因此仅选取其中一个树种（大概率为当地优势树种），并对该树种的10株随机选取的树木开展测量。已完成该树种树木直径的测量与记录工作。本次研究选取的树种为榆树（Elm）或柳树（Willow）。在完成单株随机选取的成熟树木直径测量后，研究人员会在其附近寻找同树种的幼树，测量该成熟树与幼树之间的距离（要求幼树紧邻成熟树）并记录相关观测数据。完成二者间距测量后，再使用卷尺测量幼树的直径（通常幼树直径远小于成熟树），所有观测数据均已完成记录。针对成熟树的冠幅覆盖情况，研究人员使用相机拍摄该树木的静态照片（拍摄时以手指框定取景范围，形成方形构图），随后通过照片估算可见天空占比——经约定，可见天空占比越高则代表树木叶片覆盖度越低。在记录完所有观测数据后，对各项百分比进行估算。由于多数树木枝干相互缠绕，当难以定位目标叶片时，研究人员会摇晃树木枝干以辅助观察。本次研究确保已完整记录调研地点、可记录的环境条件以及当日时段等相关信息。