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Methodologies for estimating forest soil carbon stocks using annual forest inventory data
Charles H. (Hobie) PerryNorthern Research StationUSDA Forest ServiceImage courtesy USDA NRCS
Northern Research StationUSDA Forest Service
Outline
1. Goals of USDA Forest Inventory & Analysis Program
2. Sampling Design and Estimation
3. Analysis & Reporting4. FIA and the Broader Soils
Community
Northern Research StationUSDA Forest Service
1 National program goals
Northern Research StationUSDA Forest Service
Context
There are many challenges topopulation estimation.• Logistically difficult• Risky and expensive• Limited utility of existing data
(incl., STATSGO & SSURGO)– Infrequent sampling– Traditional agricultural emphasis
FIA designed as part of an
integrated monitoring
system
Source: FIA Fact Sheet Series
Northern Research StationUSDA Forest Service
The role of FIA
• The extent (area) of forest land;• The volume, growth, and removal of
forest resources; and• The health and condition of the
forest.
To conduct forest inventories of the United States to estimate:
Image creditUSDA NRCS
Northern Research StationUSDA Forest Service
Strategic Objectives
• National plot configuration, sampling design, variables and measurement protocols
• Estimation using standardized formulae• Data released at prescribed intervals• A national database with user-friendly access• Nationally consistent reports (5 years)• Peer review/publication of outputs/procedures
Northern Research StationUSDA Forest Service
1a Monitoring questions for the Soil Quality Indicator
More than a soil carbon inventory…
http://forest.moscowfsl.wsu.edu/engr/roadph.html
Soil erosion?
Changes in soil physical properties?
Sour
ce: O
’Nei
ll et
al.
2005
.
Changes in other soil chemical properties?
Sour
ce: M
cWilli
ams
et a
l. In
pre
p.
Northern Research StationUSDA Forest Service
2 Sample design & estimation
Northern Research StationUSDA Forest Service
Sampling and estimation occurs in three phases
Phase 1
Phase 2
Phase 3
Remotely sensed data used to obtain initial plot land cover observations and to stratify land areas with the objective of increasing precision
Field crews visit to locations of plots with accessible forest to measure traditional suite of mensurational variables
Measurement of an additional suite of variables related to the health of the forest on a 1:16 proportion of Phase 2 plots
Northern Research StationUSDA Forest Service
What do these phases look like?
Sour
ce: O
’Nei
ll et
al.
2005
.
38 800 ha2 425 ha
Northern Research StationUSDA Forest Service
Hexes are assigned to panels,and plots are located in hexes
Northern Research StationUSDA Forest Service
FIA definitions split the landscape into “forest” and “non-forest”
Accessible forest land• Timberland • Pastured
timberland • Plantations• Wide windbreaks• Wooded pasture• Urban forest land
Non-forest with trees• Cropland with trees• Pasture and
rangeland with trees
• Wooded strip• Narrow windbreak• Shelterbelt• Urban and other
with trees
Northern Research StationUSDA Forest Service
Basic plot design includesfour subplots
Northern Research StationUSDA Forest Service
Soils sampling scheme
9 7 5 3 1 2 4 6 8
Soil Sampling Points
Soil sampling line (point sample)
4 3
1
2Erosion and 24.0 ft radiuscompaction
Annular plot 58.9 ft rad ius
Subplot
9 7 5 3 1 2 4 6 8
Soil Sampling Points
9 7 5 3 1 2 4 6 8
Soil Sampling Points
Soil sampling line (point sample)Soil sampling line (point sample)Soil sampling line (point sample)
4 3
1
2Erosion and 24.0 ft radiuscompaction
Annular plot 58.9 ft rad ius
Subplot
Soil measurements are collected on the subplots and within the annular plots. Soil samples are collected from within the annular plots 2, 3, and 4 only.
Adap
ted
from
O’N
eill
et a
l. 20
05.
We measure, then sample…
Litter layer
Organic layer
Mineral soil
RestrictiveLayer (?)
N
W
S
E30.5 cm
12
3
50 cm
0 cm
10 cm
20 cm
Top view
Side View
Northern Research StationUSDA Forest Service
Measured soil attributes include…
• Erosion assessment– % bare soil
• Soil compaction assessment– % area compacted– Compaction type
• Soil sampling– Forest floor and litter thickness– Forest floor sample collection– Depth to restrictive layer– Mineral soil sample collection
• 0 – 4 in• 4 – 8 in
– Soil texture
• Forest floor– Physical properties:
• Bulk density• Water content
– Chemical properties:• Total carbon (organic)• Total nitrogen
• Mineral soil– Physical properties:
• Bulk density• Water content• Coarse fragments (> 2 mm)
– Chemical properties:• Organic and inorganic carbon• Total nitrogen• pH• Exchangeable cations (Na, K, Mg,
Ca, Al), metals (Mn, Ni, Cu, Zn, Cd, Pb), sulfur and phosphorus
Fiel
d M
easu
rem
ents
Lab
Mea
sure
men
ts
Northern Research StationUSDA Forest Service
2a Estimation units:the other challenge
STATSGO/SSURGO
Northern Research StationUSDA Forest Service
Northern Research StationUSDA Forest Service
Northern Research StationUSDA Forest Service
Northern Research StationUSDA Forest Service
3 Analysis and reporting
Northern Research StationUSDA Forest Service
We report at many scales
• National FHM report
• Regional studies
• State reports
• Where is international reporting?
National FHM report
Sour
ce: P
erry
and
Am
ache
r. In
pre
ss.
Sour
ce: P
erry
and
Am
ache
r. In
pre
ss.
Northern Research StationUSDA Forest Service
Regional carbon studyforest floor
Sour
ce: P
erry
et a
l. In
pre
ss.
Northern Research StationUSDA Forest Service
Regional carbon studymineral soil (0-20 cm)
Sour
ce: P
erry
et a
l. In
pre
ss.
Northern Research StationUSDA Forest Service
State reporting
0
1
2
3
4
5
6
7
8
9
Aspen / birch Maple / beech /birch
Oak / hickory Spruce / fir White / red / jackpine
Forest Type Group
Fore
st fl
oor t
hick
ness
(cm
)
Source: Miles et al. In press.
0
5
10
15
20
25
30
35
40
45
50
Aspen / birch Maple / beech /birch
Oak / hickory Spruce / fir White / red / jackpine
Forest type groupFo
rest
floo
r car
bon
cont
ent (
%)
Sour
ce: M
iles
et a
l.In
pre
ss.
Northern Research StationUSDA Forest Service
4 Data dissemination
FIA Reports
http://ncrs.fs.fed.us/pubs/3513
Northern Research StationUSDA Forest Service
Individual Data Requests
• Joint Research
• Specific Data Needs
• Limited
Northern Research StationUSDA Forest Service
5 FIA & the broader soils community
Northern Research StationUSDA Forest Service
How does FIA fit?
Fitting in• Rolling annual
inventory• Filling gaps with
forest soils sampling• Sharing data with a
cyber-infrastructure
Falling short• Only on “forestland”• Limited soil sampling• Continuing struggle
with appropriate estimation units
Northern Research StationUSDA Forest Service
What are the limitations to the current inventory?
• Requirements• Focus on traditional resources
– P3 sampling intensity
Definition-oriented and thus tied directly to the original purpose of the program
Moving to an all-tree inventory
Northern Research StationUSDA Forest Service
Take-home messages
• FIA is a statistically-sound forest resource inventory with a national mandate.
• There is room for improvement,
• and that’s where you come in!
fincontact: charleshperry@fs.fed.us+1 651 649 5191
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