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Forest Survey Can you identify this tree?

Forest Survey Can you identify this tree?. Red Maple . Research Methods- Sampling with Transect Line Why will we be using quadrats (plots) in the Idlewood Forest? (view quadrats on a transect line ).

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Forest Survey Can you identify this tree?

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  1. Forest SurveyCan you identify this tree?

  2. Red Maple

  3. Research Methods- Sampling with Transect LineWhy will we be using quadrats (plots) in the IdlewoodForest? (view quadrats on a transect line) • http://www.nrri.umn.edu/worms/research/methods_transects.html

  4. Percentage, Quads, Random Sampling • Fundamental Question in Ecology: • Estimating the number of organisms in a certain place at a certain time.

  5. Quadrat sampling – based on measurement of replicated sample units ; “quadrats” or “plots”. • Allows “absolute density“= # of individuals / unit area within the study site

  6. Terms: How Many? 1. Total Populations = total # of individuals of each species 2. Density = # of individuals of a species / unit area How Often? 3. Frequency = percentage (%) of times a species occurs in the sample quadrats How Much Stuff? 4. Biomass / Cover = amount of living material produced by a species (Total Diameters will be used to indicate Biomass of a tree species)

  7. Quadrat Sampling explanation http://www.youtube.com/watch?v=lE0n0767AVU • Then – Use the information on the “Combined Data Chart” to calculate: (directions, page 2) • % Relative Density • % Relative Frequency • % Relative Biomass ---- for each tree species ---- *In order to compare each tree species with other species • Later - “Importance Values” (directions, pg 4) are calculated using: • 5. Total Populations = add up all trees for each species

  8. 12’ diameter Hemlock in Huntingdon Co., Pa

  9. DBH • The most common way to measure the abundance of treesis the "diameter at breast height" or DBH of individual trees. • The DBHis the diameter of the tree's trunk at the height of the archetypal forester's chest @ 4.5 feet (1.37 m) • Vegetation scientists can calculate diameter indirectly by measuring circumference. • DBH Penn’s Woods Project, video (1:39) • http://www.youtube.com/watch?v=bWoHQ0nZosw • FIND YOUR DBH

  10. Diameter Tapes • Special measuring tapes are available that do the geometry for you. These "diameter tapes" are marked on one side in centimeters, on the other the diameter of a circle with a given circumference. • The first step in using these diameter tapes is to calibrate "breast height" on your body.

  11. Diameter Tape 2 • Start using the tape to measure DBH by attaching its end at the proper breast-height • Then stretch the tape around the trunk at breast height. • Read diameter from the point that the tape overlaps zero on the tape.

  12. What is the reading on this tape? • 55.6 cm

  13. A common mistake is using the wrong side of the tape.  • Remember, one side measures distance, just like any other tape.  Don't use that side! • Use the other side, which reads diameter when the tape is wrapped around a circular trunk.

  14. Diameter of a Tree measurement • Tree measurement using Biltmore Stick (10:12) (25” from Biltmore stick to eye) http://www.youtube.com/watch?v=R8kzuq6ecKI • How to measure tree using tape (reading) http://oregonstate.edu/instruct/bot440/wilsomar/Content/HTM-trees.htm • Diameter at breast height, DBH measurement (1:39) http://www.youtube.com/watch?v=bWoHQ0nZosw

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