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FIA’s Down Woody Materials Field Sampling Protocols 2nd of 3 Part Training Series

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FIA’s Down Woody Materials Field Sampling Protocols2nd of 3 Part Training Series

Christopher Woodall

DWM National Indicator Advisor

- Transect Segmenting
- Coarse Woody Debris
- Fine Woody Debris
- Duff, Litter and Fuelbed
- Shrubs and Herbs
- Slash Piles

2

1

3

4

Subplot

CWD

30

Annular plot

270

24 feet (h.d.)

Three / subplot

150

10 ft (s.d.)

FWD (large)

6 ft (s.d.)

FWD (small & medium)

6.8 ft. radius

microplot

14 ft

(s.d.)

20 ft

(s.d.)

24ft

(s.d.)

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

Non-Forest

CC #2

Forest

CC #1

10 ft

Transect length must equal 24 ft, Horizontal Dist.

Moderate Decay

Mostly Decayed

Freshly Fallen

Sampling Procedures Depend on Decay of Individual Pieces

Point of Intersection

Transect

Transect Diameter

CWD Piece Axis

- Decay Classes 1 - 4
- Piece >= 3” Transect Diameter
- Piece >= 3’ Long

- Decay Class 5
- Piece >= 5” Transect Diameter
- Piece >= 3’ Long
- Piece >= 5” Above ground-level

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

Forked Pieces

Each fork must meet minimum specs

Fork with largest diameter at the crotch is the ‘main bole’

2nd fork ends at the crotch

Large branch

Branch must meet minimum specs

Length measured from small end to the point where it connects to main bole

Transect

Diameter

Large End

Diameter

Small End

Diameter

Decay Class

Species

Hollow?

CWD History

Length

CWD distance

Decay Class

1-4

5

Measure

here

Measure

here

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

CWD Length

CWD Length

CWD Diameter

CWD Diameter

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

30

Tallied on 150 degree transect on each subplot

270

150

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 ”

14 ft

(s.d.)

20 ft

(s.d.)

24ft

(s.d.)

- Estimate FWD tally after count > 50 for diameter < 1 inch
- Estimate FWD tally after count > 20 for diameter >= 1 inch
- Make attempt to tally FWD first due to trampling
- If count exceeds 100 in any size class indicate reason why (i.e. rat’s nest or fallen tree)
- If a pile intersects the FWD transect (14 – 24’) do not measure FWD (code ‘Yes’ for ‘RP_on_transect’)

Depth of 3 fuel layers above mineral soil

CWD & FWD

Subplot

Fuelbed

Depth

Litter

Duff

Mineral Soil

Obstructions:

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

0

1

2

All sampled

Nothing 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

Shrubs

Herbs

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

- Tally CWD piles where efficiency of sampling is improved using pile protocol instead of transects
- Pile’s center must be in accessible forest land
- Pile’s center must be < 24 ft h.d. from subplot center
- Pile must contain pieces of CWD >= 3” diameter
- Estimate % of pile that contains CWD >= 3” (packing ratio)

Stacked cord approaches 80% density

=

=

=

20%

01%

http://www.ncrs.fs.fed.us/4801/national-programs/indicators/dwm/