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 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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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 protocols 2nd of 3 part training series

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

Christopher Woodall

DWM National Indicator Advisor


Outline

Outline

  • Transect Segmenting

  • Coarse Woody Debris

  • Fine Woody Debris

  • Duff, Litter and Fuelbed

  • Shrubs and Herbs

  • Slash Piles


Fia s down woody materials field sampling protocols 2nd of 3 part training series

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


Transect segmenting

Transect Segmenting

1) Only sample DWM components on accessible forest land

2) Must map changes in forest condition classes along transects


Transect segmenting1

Transect Segmenting

Non-Forest

CC #2

Forest

CC #1

10 ft

Transect length must equal 24 ft, Horizontal Dist.


Coarse woody debris

Coarse Woody Debris

Moderate Decay

Mostly Decayed

Freshly Fallen

Sampling Procedures Depend on Decay of Individual Pieces


Cwd decay classes

CWD Decay Classes


Cwd tally rules

CWD Tally Rules

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


Cwd tally rules cont d

CWD Tally Rules Cont’d

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


Cwd forks and branches

CWD Forks and Branches

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


Cwd measurements

CWD Measurements

Transect

Diameter

Large End

Diameter

Small End

Diameter

Decay Class

Species

Hollow?

CWD History

Length

CWD distance

Decay Class

1-4

5


Cwd lengths and diameters

CWD Lengths and Diameters

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.


Cwd lengths

CWD Lengths

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


Fine woody debris

Fine Woody Debris

Count FWD pieces, by size class, intersecting subplot transects


Fwd sample design

FWD Sample Design

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.)


Fwd tally rules

FWD Tally Rules

  • 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’)


Duff litter and fuelbed

Duff, Litter, and Fuelbed

Depth of 3 fuel layers above mineral soil


Duff litter and fuelbed1

Duff, Litter, and Fuelbed

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 litter fuelbed

Duff, Litter, Fuelbed

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


Microplot fuels

Microplot Fuels

10% Cover Classes


Microplot sampling

Microplot Sampling

Estimate coverage (%) and tallest height (ft) of live/deadshrubs/herbs on microplot

Estimate coverage (%) of litter on microplot


Microplot sampling1

Microplot Sampling

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)


Slash residue piles

Slash/Residue Piles

Every slash pile, whose center coincides with a subplot, is assigned to a shape category, dimensions measured, and density estimated


Slash residue tally rules

Slash/Residue Tally Rules

  • 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)


Pile shape codes

Pile Shape Codes


Pile density estimation

Pile Density Estimation

Stacked cord approaches 80% density

=

=

=

20%

01%


End of part 2 of 3

End of Part 2 of 3

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


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