Canopy Cover and Diameter at Breast Height of Adult and Sapling Trees at York University

A field study was conducted examining tree trunk diameter, corresponding canopy coverage, and location of same species saplings. Methods: - Experimenters performed the study in woodlands at York University- Two 25m Transect tape rollers were used to mark 50m of woodland- Students proceeded along Transect tape and located mature trees, approximately 3.5m or taller. - Mature tree diameter at breast height (approximately 1.5m) was recorded; as well as canopy coverage, as a percentage. - Saplings of the same species were then located, and distance from adult along with diameter at breast height (DBH) were recorded. - The process was carried out for 50m of woodland totalling to 10 adult trees. Hypothesis: There will be a correlation between the distance a sapling is from an adult tree and the diameter at breast height (DBH) of the adult tree. Prediction: There will be a larger distance between the sapling and an adult as the DBH of the adult increases. As DBH increases so does the height of the tree, allowing for a wider distribution of seeds causing saplings to be at greater distances from the adult. Metadata: - Diameter at Breast Height: A numerical, quantitative measure of the diameter of a tree at approximately 1.5m above the ground, recorded in metres. - Canopy Coverage: Quantitative and numerical data. Approximate canopy coverage as a percentage was recorded using hands to estimate. - Distance of Same Species Sapling: A numerical, quantitative observation recording the distance in metres from the adult tree to the closest sapling of the same species.

本研究开展了一项野外调查，旨在探究树干胸径、对应冠幅覆盖率以及同物种幼树的分布位置。

研究方法：
- 研究人员在约克大学（York University）所辖林地开展本次调查。使用两卷25米长的样带卷尺，标记出总长50米的林地带段。
- 参与调查的学生沿样带行进，定位高度约3.5米及以上的成熟林木。
- 记录每株成熟林木的胸径（距地面约1.5米处的树干直径）以及以百分比计的冠幅覆盖率。
- 随后定位同物种的幼树，记录该幼树与对应成熟林木的距离，以及该成熟林木的胸径（DBH）。
- 本次调查覆盖50米长的林地带段，共记录10株成熟林木。

研究假设：本研究提出假设，幼树与成熟林木之间的距离与成熟林木的胸径（DBH）存在相关性。

研究预测：研究预测，成熟林木的胸径越大，其与幼树之间的距离也越大。这是因为随着胸径增长，树木高度会同步提升，使得种子传播范围更广，进而导致幼树与母树的距离更远。

元数据说明：
- 胸径（Diameter at Breast Height, DBH）：以米为单位的数值型定量指标，指树木距地面约1.5米处的树干直径。
- 冠幅覆盖率：数值型定量数据，以百分比形式记录林木的近似冠幅覆盖比例，通过人工目视估算。
- 同物种幼树距离：数值型定量观测指标，记录成熟林木与其最近的同物种幼树之间的距离，单位为米。