GNNFire Plot Databases

Plot identification

PLTID

Unique plot identification number

FCID

Unique forest class identification number

DATA_SOURCE

Source of the plot data

BLMWO	BLM in western Oregon
FIACA	FIA in California
FIAEW	FIA in eastern Washington
FIAWO	FIA in western Oregon
NCNP	North Cascades National Park
R5	Forest Service Region 5
R6	Forest Service Region 6
SEKI	Sequoia-Kings Canyon National Park
YOSE	Yosemite National Park

Live tree

BAA_GE_3

Basal area (m2/ha) of all live trees >=2.54 cm dbh

BAC_GE_3

Basal area (m2/ha) of all live conifers >=2.54 cm dbh

BAH_GE_3

Basal area (m2/ha) of all live hardwoods >=2.54 cm dbh

BAH_PROP

Proportion of total live tree basal area that is hardwood

QMDA_DOM

Quadratic mean diameter (QMD) (cm) of all dominant and codominant trees

QMDC_DOM

QMD (cm) of all dominant and codominant conifers

QMDH_DOM

QMD (cm) of all dominant and codominant hardwoods

CANCOV

Canopy cover (percent) of all live trees, calculated using methods in the Forest Vegetation Simulator (Crookston and Stage 1999)

CANCOV_CON

Canopy cover (percent) of all conifers, calculated using methods in the Forest Vegetation Simulator (Crookston and Stage 1999)

CANCOV_HDW

Canopy cover (percent) of all hardwoods, calculated using methods in the Forest Vegetation Simulator (Crookston and Stage 1999)

STNDHGT

Average height (m) of dominant and codominant trees.

FORTYPBA

Forest type (alpha code comprised of one or two species codes). Assigned based on plurality of species basal area, as follows:

If CANCOV <10 then FORTYPBA = "remnant"; If BAH_PROP >=0.65 and >=80% of the hardwood basal area is in one species, a single hardwood species is assigned; otherwise FORTYPBA is named for the two predominant hardwood species. If BAH_PROP 0.20-0.64, FORTYPBA is named by the dominant hardwood species and the dominant conifer species, shown in order of most basal area. If BAHPROP <0.20 and >=80% of total conifer basal areas is in one species, FORTYPBA is that single (conifer) species; otherwise, FORTYPBA is named for the two predominant conifer species. Species codes are defined in the plot database.

VEGCLASS

Vegetation class from Johnson and O'Neil (2001)

1	Sparse (CANCOV <10)
2	Open (CANCOV 10-39)
3	Broadleaf, sap/pole, mod/closed (CANCOV >=40, BAH_PROP >=0.65, QMDA_DOM <25 cm )
4	Broadleaf, sm/med/lg, mod/closed (CANCOV >=40, BAH_PROP >=0.65, QMDA_DOM >25 cm)
5	Mixed, sap/pole, mod/closed (CANCOV >=40, BAH_PROP 0.20-0.64, QMDA_DOM <25 cm)
6	Mixed, sm/med, mod/closed (CANCOV >=40, BAH_PROP 0.20-0.64, QMDA_DOM 25-50 cm)
7	Mixed, large+giant, mod/closed (CANCOV >=40, BAH_PROP 0.20-0.64, QMDA_DOM >50 cm)
8	Conifer, sap/pole, mod/closed (CANCOV >=40, BAH_PROP <0.20, QMDA_DOM <25 cm)
9	Conifer, sm/med, mod/closed (CANCOV >=40, BAH_PROP <0.20, QMDA_DOM 25-50 cm)
10	Conifer, large, mod/closed (CANCOV >=40, BAH_PROP <0.20, QMDA_DOM 50-75 cm)
11	Conifer, giant, mod/closed (CANCOV >=40, BAH_PROP <0.20, QMDA_DOM >75 cm)

SIZECL

Size class from Johnson and O'Neil (2001, p. 116-119)

1	Shrub/seedling (QMDA_DOM <2.5 or CANCOV <10)
2	Sapling/pole (QMDA_DOM >=2.5 and <25.0)
3	Small tree (QMDA_DOM >=25.0 and <37.5)
4	Medium tree (QMDA_DOM >=37.5 and <50.0)
5	Large tree (QMDA_DOM >=50.0 and <75)
6	Giant tree (QMDA_DOM >=75.0)

COVCL

Cover class from Johnson and O'Neil (2001, p. 116-119)

1	Sparse/remnant (CANCOV <10)
2	Open (CANCOV >=10 and <40)
3	Moderate (CANCOV >=40 and <70)
4	Closed (CANCOV >=70)

CWHR_SIZE

Size class from California Wildlife Habitat Relationships Program (Mayer and Laudenslayer 1988) (California only)

1	Seedling tree (CANCOV < 10)
2	Sapling tree (CANCOV >= 10 and QMDA_DOM 2.54-15.24)
3	Pole tree (CANCOV >= 10 and QMDA_DOM 15.24-27.94)
4	Small tree (CANCOV >= 10 and QMDA_DOM 27.94-60.96)
5	Medium/large tree (CANCOV >= 10 and QMDA_DOM > 60.96)
6	Multi-layered tree (CANCOV >= 60 and at least two canopy layers present)

CWHR_DENSITY

Canopy closure class from CWHR (Mayer and Laudenslayer 1988) (California only)

NA	(not applicable -- CANCOV <10)
S	(sparse, CANCOV 10-24)
P	(open, CANCOV 25-39)
M	(moderate, CANCOV 40-59)
D	(dense, CANCOV 60-100)

Understory

SHRCOV

Cumulative cover (percent) of all shrubs (may be >100%). [Not available for Oregon.]

Snag

STPH_GE_25

Density (trees/ha) of snags >=25.0 cm dbh and >=2.0 m tall

STPH_GE_50

Density (trees/ha) of snags >=50.0 cm dbh and >=2.0 m tall

SVPH_GE_25

Volume (m3/ha) of snags >=25.0 cm dbh and >=2.0 m tall

SVPH_GE_50

Volume (m3/ha) of snags >=50.0 cm dbh and >=2.0 m tall

SBPH_5_9

Biomass (kg/ha) of snags 5-9 inches (12.7-22.9 cm) dbh and >=2.0 m tall

SBPH_9_20

Biomass (kg/ha) of snags 9-20 inches (22.9-50.8 cm) dbh and >=2.0 m tall

SBPH_GE_20

Biomass (kg/ha) of snags >=20 inches (50.8 cm) dbh and >=2.0 m tall

Down wood

DVPH_GE_25

Volume (m3/ha) of down wood >=25.4 cm diameter at intercept and >=1 m long. [R5 plots limited to pieces >=3.0 m long. FIA plots do not include decay class 5 logs.]

DVPH_GE_50

Volume (m3/ha) of down wood >=50.0 cm diameter at intercept and >=1 m long. [R5 plots limited to pieces >=3.0 m long. FIA plots do not include decay class 5 logs.]

DBPH_9_20

Biomass (kg/ha) of down wood 9-20 inches (22.9-50.8 cm) diameter at large end and >=1 m long. [R5 plots limited to >=10 in (25.4 cm) diameter and >=3.0 m long. FIA plots do not include decay class 5 logs. Missing decay class set=3 for YOSE.]

DBPH_GE_20

Biomass (kg/ha) of down wood >=20 inches (50.8 cm) diameter at intercept and >=1 m long. [R5 plots limited to >=3.0 m long. FIA plots do not include decay class 5 logs. Missing decay class set=3 for YOSE.]

Canopy and surface fuels

PCANFWT

Total weight of all available canopy fuels (kg/ha), which includes the mass of live conifer foliage plus one-half the mass of live and dead conifer branches in the 0-0.25 inch size class (see Appendix 2). Based on equations for the coastal Pacific Northwest (used for Oregon).

RCANFWT

Total weight of all available canopy fuels (kg/ha), which includes the mass of live conifer foliage plus one-half the mass of live and dead conifer branches in the 0-0.25 inch size class (see Appendix 2). Based on equations for the northern Rocky Mountains (used for California and Washington).

PHTCBU2

Height to crown base (m) computed with vertical layering method, 'uncompacted' crowns, and equations for the coastal Pacific Northwest (see Appendix 2) (used for Oregon). Code '999' is assigned where there is minimal crown.

RHTCBU2

Height to crown base (m) computed with vertical layering method, 'uncompacted' crowns, and equations for the northern Rocky Mountains (see Appendix 2) (used for California and Washington). Code '999' is assigned where there is minimal crown.

PCBDU2

Canopy bulk density (kg/m3) computed with vertical layering method, 'uncompacted' crowns, and equations for the coastal Pacific Northwest (see Appendix 2) (used for Oregon).

RCBDU2

Canopy bulk density (kg/m3) computed with vertical layering method, 'uncompacted' crowns, and using equations for the northern Rocky Mountains (see Appendix 2) (used for California and Washington).

FUEL_MODEL

Fire behavior fuel model. For all study areas, classification rules were modified slightly from those in documentation for the appropriate variant of FVS-FFE and to reflect the fuels and vegetation variables available in the GNNFire database (see Appendix 2) and local expert knowledge.

1	short grass
2	timber (grass and understory)
5	brush
6	dormant brush, hardwood slash
8	closed timber litter
9	hardwood litter
10	timber (litter and understory)
11	light logging slash
12	medium logging slash
26	modified chaparral (California)