FIA’s Down Woody Materials Field Sampling Protocols 2nd of 3 Part Training Series. Christopher Woodall DWM National Indicator Advisor. Outline. Transect Segmenting Coarse Woody Debris Fine Woody Debris Duff, Litter and Fuelbed Shrubs and Herbs Slash Piles. 2. 1. 3. 4. Subplot.
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DWM National Indicator Advisor
24 feet (h.d.)
Three / subplot
10 ft (s.d.)
6 ft (s.d.)
FWD (small & medium)
6.8 ft. radius
One per subplot
Duff, Litter, Fuelbed depths
24 ft. location, every transect
1) Only sample DWM components on accessible forest land
2) Must map changes in forest condition classes along transects
Transect length must equal 24 ft, Horizontal Dist.
Sampling Procedures Depend on Decay of Individual Pieces
Point of Intersection
CWD Piece Axis
Only tally portion of log above ground and or above water
Standing dead trees are CWD if they lean >= 45 from vertical
Must have a diameter >= 3 inches along entire length
Tally a piece each time it intersects any transect, regardless of the number of times
If log split down center, treat as two separate pieces
Each fork must meet minimum specs
Fork with largest diameter at the crotch is the ‘main bole’
2nd fork ends at the crotch
Branch must meet minimum specs
Length measured from small end to the point where it connects to main bole
Length is measured between diameter measurements
When the ends of the log are splintered or crumbling from decay…measure the diameter at the point where it best represents the overall volume of the log.
Separates if Pulled
If CWD piece is fractured, either across diameter or length, and crew determines it would separate if pulled by either end… Then… Tally as two separate CWD pieces
Count FWD pieces, by size class, intersecting subplot transects
Tallied on 150 degree transect on each subplot
Size-Class Tally Counts
10 ft (s.d.)
Large FWD: Tally pieces 1” – 2.9”
6 ft (s.d.)
Medium FWD: Tally pieces >= ¼ ” – .9”
Small FWD: Tally pieces < ¼ ”
Depth of 3 fuel layers above mineral soil
CWD & FWD
If a rock or other significant obstruction is found at sample point, do not measure any depths.
If a log is found at sample point, measure fuelbed depth but NOT duff and litter.
Measure depths at 24 ft (slope distance) on every transect.
Duff and litter depth not sample, fuelbed sampled
Use coding options to take quality measurements, since we measure these variables at twelve points on each plot, don’t collect data if measurement obstructed or compromised
10% Cover Classes
Estimate coverage (%) and tallest height (ft) of live/deadshrubs/herbs on microplot
Estimate coverage (%) of litter on microplot
Herbs and Shrubs
Live and Dead
Live: Still attached
Shrubs: plants (non-trees), woody stems
Dead: Still attached or dislodged, but not down and decaying
Herbs: non-woody herbaceous plants including ferns, moss, lichens, sedges, and grasses (< 6 ft in height)
Every slash pile, whose center coincides with a subplot, is assigned to a shape category, dimensions measured, and density estimated
Stacked cord approaches 80% density