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LTREB Above Ground Biomass

Adult tree measurements and biomass estimates from 1934 to 2019.

agb.csv
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Variables
LTREB_Tag_2019
  • Label: LTREB_Tag_2019
  • Definition: Tags installed as part of plot census during LTREB initiation in 2014. Some 2019 tags do not match 2014 tags and are indicated here. Field is NA for all measurements taken before 2019.
  • Type: Nominal
  • Missing values: None specified
LTREB_Tag_2014
  • Label: LTREB_Tag_2014
  • Definition: Tags installed as part of plot census during LTREB initiation in 2014. In plots never before sampled, but sampled first in 2014 for LTREB, all trees will have tag IDs. For LTREB plots within older historic plots, all trees within the LTREB 0.1 ha (18 m radius) plot will have these tag IDs and possibly an Old_Tag. LTREB 2019 tags were assumed to match 2014 tags unless otherwise specified.
  • Type: Nominal
  • Missing values: None specified
Old_Tag
  • Label: Old_Tag
  • Definition: Tree tag number (or letter, or combination) assigned as part of historic (pre-2014) plot censuses. In many of the long-term forest inventory plots, trees were never tagged, but were measured as individuals each time a census was performed. For large historic plots, LTREB plots installed within these plots sometimes encountered these old tags and their identities were transcribed into the LTREB plot inventory dataset to enable tracking across past inventory data.
  • Type: Nominal
  • Missing values: None specified
Species
  • Label: Species
  • Definition: A four-character code to represent the species of the tree being measured.
  • Type: Code list
  • Codes:
    • ACPE = Striped maple, moose maple (Acer pensylvanicum)
    • ACRU = Red maple (Acer rubrum)
    • ACSA = Sugar maple (Acer saccharum)
    • AMSP = Serviceberry (Amelanchier spp)
    • BEPA = Paper birch (Betula papyrifera)
    • FAGR = American beech (Fagus grandifolia)
    • FRAM = White ash (Fraxinus americana)
    • OSVI = Hophornbeam (Ostrya virginiana)
    • QURU = Red oak (Quercus rubra)
    • TIAM = American basswood (Tilia americana)
    • TSCA = Eastern hemlock (Tsuga canadensis)
    • ULAM = American elm (Ulmus americana)
    • PIRE = Red pine (Pinus resinosa)
    • PIST = Eastern white pine (Pinus strobus)
    • POGR = Bigtooth aspen (Populus grandidentata)
    • POTR = Quaking aspen (Populus tremuloides)
    • THOC = Northern white cedar (Thuja occidentalis)
    • ABBA = Balsam fir (Abies balsamea)
    • PIGL = White spruce (Picea glauca)
    • PRSE = Black cherry (Prunus serotina)
    • PRPE = Pin cherry (Prunus pennsylvanica)
    • BEAL = Yellow birch (Betula alleghaniensis)
    • COAL = Pagoda dogwood (Cornus alternifolia)
    • RHGL = Smooth sumac (Rhus glabra)
    • SASP = Willow (Salix spp)
    • CRRO = Red-stemmed cryptantha (Cryptantha rostellata)
    • VISP = Viburnum (Viburnum spp)
    • PYSP = Pear (Pyrus spp)
    • FRNI = Black ash (Fraxinus nigra)
    • PIMA = Black spruce (Picea mariana)
    • POBA = Balsam poplar (Populus balsamifera)
    • OTHER = Species not listed.
    • ALIN = Grey alder (Alnus incana)
    • LALA = Tamarack (Larix laricina)
  • Missing values: None specified
Plot_ID
  • Label: Plot_ID
  • Definition: Standardized name of the LTREB plot containing the saplings that were counted. Check the plot descriptions file.
  • Type: Nominal
  • Missing values: None specified
Outside_Historic_Plot
  • Label: Outside_Historic_Plot
  • Definition: Denotes whether the observation occurred outside of the historic plot, as a result of plot size standardization activities carried out during LTREB initiation.
  • Type: Nominal
  • Missing values: None specified
Measure_Year
  • Label: Measure_Year
  • Definition: Year measurement was taken.
  • Type: Date/time
  • Date format: YYYY
  • Missing values: None specified
Date
  • Label: Date
  • Definition: Date that measurement was taken.
  • Type: Date/time
  • Date format: YYYY-MM-DD
  • Missing values: None specified
Distance
  • Label: Distance
  • Definition: Distance of measured tree from plot center in meters.
  • Type: Physical quantity
  • Unit: meter
  • Maximum: 22
  • Minimum: 0.5
  • Precision: Not specified
  • Missing values: None specified
Azimuth
  • Label: Azimuth
  • Definition: Compass direction in degrees with a 6 degree declination.
  • Type: Physical quantity
  • Unit: degree
  • Maximum: 385
  • Minimum: 0
  • Precision: Not specified
  • Missing values: None specified
Status
  • Label: Status
  • Definition: Type of individual tree. Before 2019, tree status includes live/dead and dominant/codominant/overtopped. In 2019, tree status only includes live/dead.
  • Type: Code list
  • Codes:
    • O = Overtopped. Tree is not part of the canopy.
    • C = Co-dominant. Tree is part of the overstory. It shares its canopy area with trees around it, not significantly taller than any tree near it.
    • D = Dominant. Tree is well above the surrounding canopy, does not share canopy spaces with other trees around it. Dominant trees are very rare. A dominant tree is obviously dominant.
    • C/O = Intermediate between co-dominant and overtopped.
    • X/D = Dead, dominant. Top of tree still present, clearly above the rest of the canopy.
    • X/O = Dead, overtopped. Top of tree still present, but under the canopy level.
    • X = Dead.Top of tree broken off.
    • L = Alive
  • Missing values: None specified
Origin_Year
  • Label: Origin_Year
  • Definition: Year of stand initiation. As best as can be determined from historic records or dendrochronology, this is the year that the trees present on a plot became established after some significant disturbance (e.g., clearcutting or stand-replacing fire). Often assumed to be equal to the age of the oldest trees present on the plot.
  • Type: Date/time
  • Date format: YYYY
  • Missing values: None specified
Years_Standing
  • Label: Years_Standing
  • Definition: Calculated number of years standing based on tree’s origin year.
  • Type: Nominal
  • Missing values: None specified
DBH
  • Label: DBH
  • Definition: Diameter at breast height size class in centimeters.
  • Type: Nominal
  • Missing values: None specified
As_Class
  • Label: As_Class
  • Definition: Marks DBH measurements that were taken in the form of a "size class" rather than an actual measurement. “Yâ€� represents size class, “Nâ€� represents actual
  • Type: Nominal
  • Missing values: None specified
AGB
  • Label: AGB
  • Definition: Calculated above ground biomass using allometric equations table.
  • Type: Nominal
  • Missing values: None specified
Estimated_Height
  • Label: Estimated_Height
  • Definition: Height of stem or dead tree in meters. Dead tree heights estimated to the nearest 0.5 meters. Dead trees indicated by Status attribute.
  • Type: Nominal
  • Missing values: None specified
Notes
  • Label: Notes
  • Definition: Additional notes on tree being measured.
  • Type: Nominal
  • Missing values: None specified
Related sites: 
LTREB Plots
CSV Header Lines: 
1
CSV Footer Lines: 
0
CSV Orientation: 
Long table
CSV Field Delimter: 
Comma (,)

Resources

Additional Information

FieldValue
mimetypetext/csv
filesize3.01 MB
resource typefile upload
timestampOct 27, 2020