Ecology Lab 5: Completed Experimental Design

Data collected from a field experiment investigating edge effects on the relationship of insect abundance and vegetation density on two different days in a grassy lot at York University.

25 meters of transect tape was laid out beginning from the edge of the grassland towards the center of the field. The edge was deemed to be any area where the grassland seemed to end or taper off. Small holes were dug for the pitfall traps, which were placed 5 meters apart from each other along the transect line. Their position relative to the edge of the grassland was measured by the transect line and was recorded. A 1m by 1m quadrat was placed on each trap, with the trap in the center, and the vegetation density was calculated by estimating the number of individual grasses and plants. This process was repeated for a total of 4 different transects with 5 pitfall traps on each line, so a total of 20 pitfall traps were placed and subsequently examined after 1.5 hours to check for trapped insects.

本数据集采集自一项野外实验，该实验旨在探究约克大学（York University）一片草地内，边缘效应（edge effects）对昆虫丰度（insect abundance）与植被密度（vegetation density）之间关系的影响，实验分两日开展。
实验人员从草地边缘向田野中心铺设了总长25米的样带卷尺（transect tape）。本研究将草地边缘定义为草地出现终止或逐渐收窄的区域。为布设陷阱诱捕器（pitfall trap），需预先挖掘小型坑穴，随后沿样带每隔5米放置一个陷阱。通过样带卷尺测量并记录各陷阱相对于草地边缘的位置。每个陷阱上方均放置1m×1m的样方（quadrat），陷阱位于样方中心，通过估算单株草本与植物个体的数量来计算植被密度。本实验共设置4条样带，每条样带配备5个陷阱诱捕器，总计布设20个陷阱。陷阱布设完成1.5小时后，回收所有装置并检查其中捕获的昆虫。