A Quantitative Analysis of Four Variables Along a Grassland Transect

Methods: For this lab, students worked in groups of 3-5 individuals. The number of members in this group was five. Four datasets were collected, one published by each group member. Transects were used within the grassland to collect this dataset: randomly place transect tape, walk along it, and select a visible plant species that is relatively simple to identify and recognize quickly. Every time a target plant species was recognized, the distance on the transect found, its height, the number of leaves, the number of flowers, and whether it was in a crowded patch of other plants (0 = open, 1 some plants nearby, 2 = quite a few plants, and 3 = very crowded bunch of plants within 50 cm) were all recorded. At least 50 individuals were sampled. If there was a need to run out another transect to capture 25 plants of the entire species, a random number table was used and the tape was moved over, in order to repeat the experiment. Outside Conditions: 90% shade cover, shards of sunlight coming through the spaces in the trees' canopy, slight breeze, little to no grass in the analyzed quadrats, dead maple leaves of varying colors, cool (lower than room temperature), last set of data recorded at 5:09 pm, occasional encounter of snails on plants, frequent observation of Purple Aster, and Canadian Goldenrod plants, maple leaf saplings varied in size from a bud, to a fully grown plant.

实验方法：本实验中，学生以3-5人为一组开展合作，本次实验小组共有5名成员。共收集4组数据集，每组数据集由一名小组成员独立采集。本次数据集采用样带法（transects）在草地生境中完成：先随机布设样带卷尺，沿样带行进时选取易于快速识别的可见植物物种。每识别到一种目标植物物种时，需记录其在样带上的位置距离、植株高度、叶片数量、花朵数量，以及该植株所处生境的植株拥挤程度（0代表开阔无邻近植株，1代表周边存在少量植株，2代表周边存在较多植株，3代表50厘米范围内植株极为密集）。每组实验至少需采样50个植株个体；若需增设一条样带以采集该物种的25个植株样本，则需使用随机数表重新布设样带，重复实验流程。
外部环境条件：实验区域遮阴覆盖率达90%，阳光透过林冠缝隙形成斑驳光斑，伴有微风；样方内几乎无草本植物覆盖，散落着不同颜色的枯枫叶；环境温度低于室温，本次数据采集的最后一组记录时间为下午5:09；实验过程中偶见蜗牛附着于植株上，频繁观察到紫菀（Purple Aster）和加拿大一枝黄花（Canadian Goldenrod）；枫树苗的尺寸差异显著，从萌芽状态至成熟植株均有分布。