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Data
dictionary for file 'pedon01', S3C Database, Version 20040427 |
[USGS, United States
Geological Survey; USDA, United States Department of Agriculture; NRCS,
Natural Resources Conservation Service; STATSGO, State Soil Geographic;
SSURGO, Soil Survey Geographic; VARIABLE FORMAT--Dw.d, where D=data type (C,
character; F, floating point; I, integer), w=field width, d=precision; FIPS,
Federal Information Processing Standard; NAD, North American Datum; DMS,
degrees, minutes, seconds; DD, decimal degrees; %, weight percent; cm,
centimeter; mm, millimeter; g cm-3, grams per cubic centimeter; kg m-2,
kilograms per square meter; SU, standard pH unit; kPa, kilopascal. Where variable names have the italicized
suffix hh, there is a separate
variable in the database for each of the following depth intervals: 0-10 cm (hh = 01), 0-20 cm (hh = 02), 0-50 cm (hh = 05), 0-100 cm (hh = 10), 10-20 cm (hh = 12), 20-50 cm (hh = 25), 50-100 cm (hh = 51). The methodology
for computing standard-interval values is presented in Buell and Markewich
(2004, footnote 8).] |
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VARIABLE NAME |
VARIABLE FORMAT (Dw.d) |
DEFINITION |
UNITS |
pedkey |
C16 |
Combination of 'source' and 'idped'.
Primary key ('pedon01' table) linking pedon and horizon ('horiz01'
table) records. |
|
source |
C4 |
Origin of source dataset (danl, feld, lasu, nssc, uark, uiuc)1. |
|
idfips |
C5 |
Concatenation of two-letter state abbreviation and county FIPS code. |
|
idped |
I9 |
4-digit calendar year the pedon was sampled * 100000 + a unique pedon
identifier. |
|
series |
C32 |
Soil series to which the pedon was classified, either by NRCS or by
USGS using NRCS soil series data and USDA-NRCS STATSGO6/SSURGO7 digital soil maps or published USDA-NRCS county soil
surveys. For details on soil-series
name assignments, see Buell and Markewich (2003, footnote 8). Taxonomic link to 'taxon01' table. |
|
year |
I4 |
Year the pedon samples were collected. |
|
county |
C32 |
County in which the pedon samples were collected. |
|
lat |
C7 |
Latitude of pedon location.
Datum NAD27. |
DMS |
long |
C8 |
Longitude of pedon location.
Datum NAD27. |
DMS |
dlat |
F12.6 |
Decimal latitude of pedon location.
Datum NAD27. |
DD |
dlong |
F12.6 |
Decimal longitude of pedon location.
Datum NAD27. |
DD |
numlayer |
I10 |
Number of mineral horizons in the pedon. |
|
sand_hh |
F10.1 |
Mass-weighted8
mean weight percent (2 mm base, air-dried sample) of particles >0.05 mm
and <2.0 mm diameter in the hh cm depth interval measuring downward from the mineral surface
(USDA system for classification of soils and sample particle-size data)2,3. |
% |
silt_hh |
F10.1 |
Mass-weighted8
mean weight percent (2 mm base, air-dried sample) of particles >0.002 mm
and <0.05 mm diameter in the hh cm depth interval measuring downward from the mineral surface
(USDA system for classification of soils and sample particle-size data)2,3. |
% |
clay_hh |
F10.1 |
Mass-weighted8
mean weight percent (2 mm base, air-dried sample) of particles <0.002 mm
diameter in the hh cm
depth interval measuring downward from the mineral surface (USDA system for
classification of soils and sample particle-size data)2,3. |
% |
txclpshh |
C8 |
Texture class of soil based on the mass-weighted8 mean particle size data (total sand+silt+clay) in the hh cm depth interval measuring
downward from the mineral surface (USDA system for classification of soils
and sample particle-size data)2,3. |
|
bd3_hh |
F10.2 |
Mass-weighted8
mean bulk density (2 mm base) of natural clods (desorbed to 1/3 bar [33 kPa]
tension water content2,3) in the hh
cm depth interval measuring downward from the mineral surface. |
g cm-3 |
bdod_hh |
F10.2 |
Mass-weighted8
mean bulk density (2 mm base) of natural clods (oven-dried at 105oC2,3) in the hh cm depth interval measuring
downward from the mineral surface. |
g cm-3 |
caco3_hh |
F10.2 |
Mass-weighted8
mean weight percent carbonate expressed as equivalent CaCO3 (2 mm base, air-dried
sample) in the hh cm
depth interval measuring downward from the mineral surface. Carbonate calculated from manometric
measurements of CO2 evolved from
HCl-treated samples2,3. |
% |
phh2o_hh |
F10.1 |
Mass-weighted8
mean pH equivalent (2 mm base, air-dried sample; pH based on mean
hydrogen-ion activity) in the hh cm depth interval measuring downward from the mineral surface.
pH is measured in a 1:1 mixture of soil and distilled water2,3. |
SU |
w15ad_hh |
F10.2 |
Mass-weighted8
mean weight percent gravimetric water content (2 mm base, air-dried sample
equilibrated at 15 bar [1500 kPa] tension) in the hh cm depth interval measuring downward from the mineral surface2,3. |
% |
oc_hh |
F10.2 |
Mass-weighted8
mean weight percent organic carbon (2 mm base, air-dried sample) in the hh cm depth interval measuring
downward from the mineral surface. Generally, pre-1995 organic-carbon
measurements were done by the Walkley-Black method2,3,4; since 1995 most organic-carbon measurements have been made by
dry-combustion to CO2 with quantitation by infrared absorption2,3. |
% |
ocmc_hhc |
F10.2 |
Mass of organic carbon (2 mm base, 1/3-bar bulk density) in the hh cm depth interval measuring
downward from the mineral surface8. |
kg m-2 |
smc_hhc |
F10.2 |
Mass of soil (2 mm base, 1/3-bar bulk density) in the hh cm depth interval measuring
downward from the mineral surface8. |
kg m-2 |
svsg_hh |
I10 |
Soil volume (whole-soil base) in the hh cm depth interval in a unit volume of one square meter one
centimeter thick (10000 cm3). This volume is
calculated from the coarse-fragment data for each soil series in the
USDA-NRCS STATSGO6/SSURGO7 databases. When
multiple records exist for a series, median values are used8. The calculated soil volume is used to
adjust mass storage for the rock volume in the soil profile. |
cm3 |
stempcl |
C16 |
Soil temperature class--soil category based on mean annual or seasonal
soil temperatures as defined by the USDA NRCS5. |
|
smregime |
C16 |
Soil moisture regime as defined by the USDA NRCS5. |
|
calrecl |
C12 |
Calcareous reaction class--soil category based on the presence or
absence of carbonate, soil reaction, and aluminum concentration as defined by
the USDA NRCS5. |
|
mincl |
C16 |
Mineral class--soil category based on the mineralogy of one or more of
particle-size components of a soil as defined by the USDA NRCS5. |
|
soilfam |
C132 |
Soil family--the fifth highest level of soil taxonomic classification
(subdivision of soil subgroup) as defined by the USDA NRCS5. |
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1/ danl, Daniels, W.L., Everett, C.J., and
Zelazny, L.W., 1987a, Virgin hardwood forest soils of the southern
Appalachian Mountains: I. Soil
morphology and geomorphology: Soil
Science Society of America Journal, v. 51, p. 722-729, or Daniels, W.L.,
Everett, C.J., and Zelazny, L.W., 1987b, Virgin hardwood forest soils of the
southern Appalachian Mountains: II. Weathering, mineralogy, and chemical
properties: Soil Science Society of
America Journal, v. 51, p. 730-738. |
feld, Feldman, S.B., Zelazny, L.W., and
Baker, J.C., 1991a, High-elevation forest soils of the southern
Appalachians: I. Distribution of
parent materials and soil-landscape relationships: Soil Science Society of America Journal, v.
55, p. 1629-1637, or Feldman, S.B., Zelazny, L.W., and Baker, J.C., 1991b,
High-elevation forest soils of the southern Appalachians: II. Geomorphology, pedogenesis, and clay
mineralogy: Soil Science Society of
America Journal, v. 55, p. 1782-1791, or Feldman, S.B. 1989, Taxonomy,
genesis, and parent material distribution of high elevation forest soils in
the southern Appalachians: unpublished M.S. thesis, Virginia Polytechnic
Institute and State University, Blacksburg, VA, Appendix B, or Feldman, S.B., unpublished
data, provided to USGS in 2000. |
lasu, Schumacher, B.A., Day, W.J., Amacher, M.C., and Miller, B.J.,
1988, Soils of the Mississippi River alluvial plain in Louisiana: Louisiana
State University Agricultural Center, Baton Rouge, LA, Louisiana Agricultural
Experiment Station Bulletin No. 796, 275 p. |
nssc, U.S. Department of Agriculture, Natural Resources Conservation
Service, 2001, National Soil Characterization Database, accessed September 1,
2001, at URL http://ssldata.nrcs.usda.gov/. |
uark, University of Arkansas, 2000, unpublished data, Soil
Characterization Laboratory, Fayetteville, AR, provided to USGS, 1999-2000. |
uiuc, University of Illinois, 2001, Soil Characterization Database,
Soil Characterization Laboratory, Urbana-Champaign, IL, accessed February 15,
2001, at URL http://www.il.nrcs.usda.gov/technical/soils/soil_lab.html. |
2/ Soil Survey Staff, 1995, Soil survey laboratory information
manual: U.S. Department of
Agriculture, Natural Resources Conservation Service, National Soil Survey
Center, Lincoln, NE, Soil Survey Investigations Report No 45, version 1, 305
p. |
3/ Soil Survey Staff, 1996, Soil survey laboratory methods manual :
U.S. Department of Agriculture, Natural Resources Conservation Service, Soil
Survey Investigations Report No. 42, version 3, 693 p. |
4/ Walkley A., 1935, An examination of methods for determination of
organic carbon and nitrogen in soils:
Journal of Agricultural Science, v. 25, p. 598-609. |
5/ Soil Survey Staff, 1998, Keys to soil taxonomy, 8th ed.: U.S.
Department of Agriculture, Natural Resources Conservation Service, 328 p. |
6/ U.S. Department of Agriculture, Natural Resources Conservation
Service, 2001, State Soil Geographic (STATSGO) Database, accessed September
1, 2001, at URL http://www.ncgc.nrcs.usda.gov/branch/ssb/products/statsgo/index.html. |
7/ U.S. Department of Agriculture, Natural Resources Conservation
Service, 2001, Soil Survey Geographic (SSURGO) Database, accessed September
1, 2001, at URL http://www.ncgc.nrcs.usda.gov/branch/ssb/products/ssurgo/index.html. |
8/ Buell, G.R. and Markewich, H.W., in
press, Data compilation, synthesis, and calculations used for organic-carbon
storage and inventory estimates for mineral soils of the Mississippi River
basin, chap. A of Markewich,
H.M., ed., Soil-carbon storage and inventory for the continental United
States: U.S. Geological Survey
Professional Paper 1686. |
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