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Inventory Source Data

Robert Huggett Jr.

Data were pulled from Forest Inventory and Analysis surveys downloaded from the version 2.1 database and published in hardcopy historic records. Where possible, three aggregate series were developed for both softwood total growing stock volume and softwood sawtimber volume.

• Total volume
• Host species volume for the following species only: sand pine, shortleaf pine, spruce pine, table mountain pine, pitch pine, pond pine, loblolly pine, and Virginia pine.
• Broad forest type volume for the following forest types only: loblolly / shortleaf pine group and oak / pine group.

FIA survey datasets

General screens

Forestland: LANDCLCD = 1

No reserved land: RESERVCD = 0

Timberland: SITECLCD <= 6

Softwoods only: SPCD < 300

Growing stock only: TREECLCD = 2

Live trees only: STATUSCD = 1

Calculation of volumes (TPACURR = trees per acre, VOLCFNET = total net volume per tree, EXPVOL = volume expansion factor

Total softwood growing stock = TPACURR * VOLCFNET * EXPVOL

Total softwood sawtimber volume (for trees >= 9 inches dbh) =

TPACURR * VOLCFNET * EXPVOL

Total softwood pulp volume (for trees < 9 inches dbh) =

TPACURR * VOLCFNET * EXPVOL

Host species screens (SPCD = species code)

SPCD = 107 or SPCD = 110 or SPCD = 115 or SPCD = 123 or SPCD = 126 or

SPCD = 128 or SPCD = 131 or SPCD = 132 where

107 sand pine

110 shortleaf pine

115 spruce pine

123 table mountain pine

126 pitch pine

128 pond pine

131 loblolly pine

132 virginia pine

Broad forest type screens (FORTYPCD = forest type code)

(FORTYPCD >= 160 and FORTYPCD < 169) or (FORTYPCD >= 400 and FORTYPCD < 410) where

160 to 168 loblolly / shortleaf pine group

400 to 409 oak / pine group

Hardcopy Historic Records

Total softwood growing stock and total softwood sawtimber for total, host species, and broad forest type aggregates were copied directly from published tables. Note that host species and broad forest type aggregates were not always available in the tables.

Detail by state

Alabama

• FIA surveys: 1990 periodic, 2000 periodic, and 2003 annual (subcycles 3, 4, 5- midpoint year assumed to be 2002 for calculations)
• Hardcopy records
• 1982 from table 11, p. 50, table 13, p. 51, and table 14, p. 52 in

Rudis, Rossen, & Kelly. 1984. Forest Resources of Alabama. USDA FS Resource Bulletin SO-98.

Arkansas

• FIA surveys: 1995 periodic and 2004 annual (subcycles 2, 3, 4, 5- midpoint year assumed to be 2003 for calculations)
• Hardcopy records
• 1978 from tables 10 & 11, pp. 18-21, table 13, pp. 24-25, table 15, pp. 28-29, tables 31 & 32, pp. 60-61 in

Staff, Renewable Resources Evaluation Research Work Unit. 1984. Forest Statistics for Arkansas Counties. USDA FS Resource Bulletin SO-76.

Florida

• FIA surveys: 1987 periodic and 1995 periodic
• Hardcopy records
• 1970 from Knight. 1970. A Preview of "Florida's Timber, 1970". USDA FS Research Note SE-136
• 1980 from tables 15 & 16, pp. 32-33 in Bechtold & Sheffield. 1981. Forest Statistics for Florida. USDA FS Resource Bulletin SE-58.
• 1987 from tables 19 & 20, pp. 32-33 in
  Bechtold, Brown, & Sheffield. 1990. Florida's Forests 1987. USDA FS Resource Bulletin SE-110.

Georgia

• FIA Surveys: 1989 periodic, 1997 periodic, and 2003 annual (subcycles 1,2,3,4,5,7- midpoint year assumed to be 2001 for calculations)
• Hardcopy records
• 1972 and 1982 from tables 15 & 16, pp.42-43, table 26, p. 50 in
  Tansy, 1983, Forest Statistics for Georgia, 1982. USDA FS Resource Bulletin SE-69.

Kentucky

• FIA Surveys: 1988 periodic and 2004 annual (subcycles 1,2,3,4,5- midpoint year assumed to be 2002 for calculations)
• Hardcopy records
• 1975 from table 47 in
• Alerich. 1990. Forest Statistics for Kentucky-- 1975 and 1988. USDA FS Resource Bulletin NE-117.

Louisiana

• FIA Surveys: 1991 periodic and 2003 annual (subcycles 2, 4,5- midpoint year assumed to be 2002 for calculations)
• Hardcopy records
• 1984 from tables 13 & 14, pp. 76-77 in
  Rosson, McWilliams, & Frey. 1988, Forest Resources of Louisiana. USDA FS Resource Bulletin SO-130.

North Carolina

• FIA Surveys: 1984 periodic, 1990 periodic, and 2002 periodic
• Hardcopy records
• 1974 from table 43, p. 78 in
  Sheffield & Knight. 1986. North Carolina's Forests. USDA FS Resource Bulletin SE-88.

South Carolina

• FIA Surveys: 1986 periodic, 1993 periodic, and 2001 annual (subcycles 1,2,3,4,5- midpoint year assumed to be 2000 for calculations)
• Hardcopy records
• 1978 from tables 13 & 14, pp. 45-46 in
  Herbert & McClure. 1979. South Carolina's Forests. USDA FS Resource Bulletin SE-51.

Tennessee

• FIA Surveys: 1989 periodic, 1999 periodic, and 2003 annual (subcycles 2,3,4,5- midpoint year assumed to be 2002 for calculations)
• Hardcopy records
• 1971 and 1980 from tables III & IV, p. 9, tables 13 & 14, pp. 31-32 in
  Birdsey. 1983. TennesseeForest Resources. USDA FS Resource Bulletin SO-90.

Texas

• FIA Surveys: 1992 periodic and 2003 annual (subcycles 1,2,3,4,5- midpoint year assumed to be 2002 for calculations)
• Hardcopy records
• 1986 from tables 12 & 14, pp. 15 & 17, table 26, p. 26 in
  Lang & Bertelson. 1987. Forest Statistics for East Texas Counties. USDA FS Resource Bulletin SO-118.

Virginia

• FIA Surveys: 1984 periodic, 1992 periodic and 2001 annual (subcycles 1,2,3,4,5- midpoint year assumed to be 2000 for calculations)
• Hardcopy records
• 1977 and 1986 from tables 19 & 20, pp. 49-50, table 43, p. 70 in
  Bechtold, Brown, & Tansey. 1987. Virginia's Forests. USDA FS Resource Bulletin SE-95.

Processing

• For each state for each of the three aggregates, annual streams of sawtimber and pulp inventory were created from the combined FIA and published hardcopy source data. For years where data was not available, an interpolation technique filled in the gaps. A change in volume was first calculated for two nonconsecutive years. This difference was then divided by the number of years between the nonconsecutive years to obtain an average annual change in inventory. For example, suppose volume in 1980 is 100 and in 1983 it is 160. Assume that no data is available for 1981 or 1982. The change in volume between 1980 and 1983 is 60. The average annual change in volume over the three year period is 20, or 60 divided by 3. The interpolated volume for 1981 is 120, which is 1980’s actual volume plus the average annual change of 20 for 1981. The interpolated volume for 1982 is 140, which is 1981’s interpolated volume of 120 plus the average annual change of 20 for 1982. Finally, the interpolated volume for 1983 is 160, which is 1982’s interpolated volume of 140 plus the average annual change of 20 for 1983. Note that the interpolated volume for 1983 should be equal to the actual volume for that year.
• If the end of the data series did not correspond to the last year of the study, 2004, then volumes were assumed constant between the last year of the series and 2004. For example, if the last year for which volume data is available is 1999, then the 1999 volume was assigned to 2000-2004.
• Board foot sawtimber volume = sawtimber cubic foot volume * 6.
• Pulp cords = pulp cubic foot volume / 72.