Project/Woodlot survey

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Contents

Project ID: 168

Project steward

Lauren Chisholm

Need

To assess volume of wood available as a resource from back woodlot. To better understand our biomass resources.

Description

To acquire knowledge of potential timber resource available


Status

  • 2018-06-20 project begun.
  • 2018-06-24 outline updated.
  • 2018-07-06 plan outlay and sample plots established
  • 2018-07-10 first trial of surveying complete and system established
  • 2018-07-19 complete following plot inventory
  • 2018-07-30 begin data entry
  • 2018-08-02 complete calculations

Project photos

Map of survey plot locations based on inventory recommendations for the stand size

caption=Map of survey plot locations based on inventory recommendations for the stand size

Leonard measuring tree DBHs

caption=Leonard measuring tree DBHs

Lauren navigating to survey plot locations by GPS

caption=Lauren navigating to survey plot locations by GPS

Anne-Sophie tree hugging during inventory

caption=Anne-Sophie tree hugging during inventory

Timeline

Week 1

July 1st, 2018
  • Determine potential outcomes, additional data that can be acquired simutaneously

          ie. Saw timber, pulpwood and of which species

  • Define property lines on GoogleMaps, identify points of interest

          GPS may or may not be needed

Week 2

  • Calculate acres of forest, determine a sample size and method

          Fixed or variable radius plot according to average DBH of trees

Week 3

  • Lay out sample plots, map locations

          Flags to mark, measuring tape or paces, compass

  • Tally trees by size and species

          ID tree species

Week 4

August 1st, 2018
  • Create Excel spreadsheet to calculate

         Calculate trees per acre, volume per acre and per species


Resources required

GPS

Measuring tape

Flagging

Compass

Tree ID guide


Results

Method

  • Determined 6 representative plots based on elevation changes
       plots 1,2,3 are 90-100 m elevation (Lower tract)
       plots 4,5,6 are 100-120 m elevation (Upper tract)
  • Woodlot is 10 acres therefore 6 - 400m2 (1/10 acre) plots were surveyed for 5-6% sampling intensity
  • Set GPS points for plots by mapping evenly distributed lengths suggested for a fixed-radius plot survey of 10 acre stand
       1 48.77357 N 123.49413W
       2 48.77482 N 123.49499W
       3 48.77426 N 123.49464W
       4 48.77357 N 123.49413W
       5 48.77380 N 123.49464W
       6 48.77431 N 123.49634W
  • Conducted fixed-radius plot survey, measuring all trees within 37ft radius that are >4in diameter
  • Heights of a representative tree were recorded for each specie
  • DBH and heights were used on a local volume table to determine expected cubic-feet
      Pseudotsuga menziesii -- Johnson, F. (1955). Volume Tables for Pacific North West Trees (Agriculture Handbook No. 92). U.S. Department of Agriculture - Forest Service.
      Thuja plicata -- Johnson, F. (1955). Volume Tables for Pacific North West Trees (Agriculture Handbook No. 92). U.S. Department of Agriculture - Forest Service.
      Acer macrophyllum -- Pillsbury, N., & Kirkley, M. (1984). Equations for Total, Wood, and Saw-log Volume for Thirteen California Hardwoods (Research Note PNW-414). U.S. Department of Agriculture - Forest Service
  • Cubic-feet of total tree abroveground volume including stem and bark

Discrepancies

  • Plot locations were predetermined with an online mapping tool, GPS and accuracy lost on ground
  • Cubic-feet estimates were from 1930s US Forest Dept. Agri. and were rounded to best fit or underscored when no information was found
  • Singificant change in specie compisition between upper and lower tract of plots not accounted for in averaging trees per acres and total volumes

Results

  • ~1300 trees in back woodlot
  • Just under 60,000 cubic-feet in total volume of wood
  • Most of the wood is Douglas fir and found in upper tract of the stand

Financial budget

No monetary costs

Labor budget

Week 1

  • 2 Persons with knowledge of property tract and interest in the overall gain of the project (a.k.a Jan)

      1 hour

Week 2

  • 1-2 persons with knowledge of set-up for taking inventory

      1-2 hours

Week 3

  • 2 persons to walk, layout and tally

      4+ hours

Week 4

  • 1 persons to enter data and carry out calculations

      4-10 hours depending on if the math makes sense


Appendix

Calc2.png


Calc1.png

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