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（transect measuring tape），对约克大学（York University）林地内10株同物种的随机选取树木的树干直径进行记录。当日天气晴朗、光照充足，是开展野外环境调研的绝佳时机，本次调研于周一下午约3时正式启动。该林地内分布有多个树种，因此仅选取其中一个物种（大概率为该区域最常见的树种），并从中随机选取10株该物种的树木。对所选树木的树干直径进行测量并记录，本次研究的树种为榆树（Elm）或柳树（willow）。
在完成随机选取的成熟树木的直径测量后，在其附近寻找同物种的幼树，测量该成熟树与幼树之间的距离（幼树应紧邻成熟树）并记录观测数据。
完成成熟树与幼树的距离测量后，使用卷尺测量幼树的树干直径（通常幼树直径远小于成熟树），并记录全部观测数据。
针对成熟树的树冠覆盖率，使用相机拍摄该树木的静态影像（拍摄方式等效于用手指框出正方形取景范围）。随后查看照片，估算可见天空的占比：通常可见天空占比越高，代表树木叶片覆盖率越低。记录全部观测结果后，估算出叶片覆盖率的百分比。当难以定位目标树木的叶片时，摇晃该树枝以辅助观察——由于多数树木枝干相互缠绕，此举可有效暴露叶片。本次调研确保了研究样地、可记录的环境条件以及当日时刻的全部信息均被完整记录。