UBC Undergraduate Research

Main Mall Tree Inventory Ho, Jane


For my capstone project, I conducted a tree inventory of the red oaks (Quercus rubra) on Main Mall. In total, I inventoried the red oaks from Agronomy Road to Agricultural Road (Figure 1). I am also working for UBC SEEDS who is interested in acquiring data from multiple tree inventories on campus. An updated campus tree inventory can help managers better understand the condition of UBC’s urban forest assets and ultimately, help with the development of an urban forest management plan. The Main Mall was a high priority area to be inventoried since it is frequently used and an iconic part of the core campus environment. The parameters I had collected were GPS coordinates, DBH, crown height, tree height, tree tag ID, crown width, percentage of green groundcover, and probability of failure. These parameters were decided based on UBC’s Tree Inventory Handbook. This handbook was another SEEDS project developed by other undergraduates who conducted a tree inventory at UBC’s Stadium Neighbourhood. To collect GPS Coordinates, I used the Avenza Maps application on an android device. Crown and tree height were accurately measured using the Nikon Laser Rangefinder. The D-tape was used for finding DBH at approximately 1.3m from the base of the tree. Recorded figures for each tree’s crown width are an average taken from the crown measured from north to south and east to west orientation. Crown width was measured with a tape measure initially. Once I gained the concept for sensible figures for width and found out my pacing measurements, pacing was done to find crown width. Percentage of green groundcover and probability of failure was based off of visual assessments. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”

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