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Geog 215: Introduction to Biogeography |
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| Field Mapping | ||||||
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| Objective To produce a map (see example) of the distribution of trees in the research plot on Burnaby Mountain. This exercise illustrates some of the problems in mapping plant distributions, and serves as a database for future assignments. Keep two photocopies of your map for future reference. Tasks (work in groups of three) 1. Use the accompanying base map to show the distribution of tree stems and associated canopy margins in your group's transect. All trees should be identified to species and allotted to one of four size categories: a) mature trees which are canopy dominants, b) mature trees which are subdominant, c) saplings (<2 m tall), and d) seedlings (<0.2m tall). The species you might encounter include three coniferous trees: (western hemlock, western red cedar and Douglas-fir), and three deciduous trees (red alder, birch, and big-leaf maple). Ignore "shrubs" such as vine-maple and huckleberries. 2. Estimate the position of the margins of each tree crown. Coordinate your efforts with those of your neighbours to minimize errors. 3. Estimate (to the nearest 10 cm) the dbh (diameter at breast height) of all stems of monopodial (single-stemmed) trees (i.e., exclude multiple stemmed trees such as vine maple). Mark (3% of course grade) based on clarity and tidiness of final map. |
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