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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
Variables (legacy): 

Sort

  • Label:
  • Definition: Entry ID number
  • Type: Nominal
  • Missing values: None specified

Plot

  • Label:
  • Definition: Plot number where observations were made, corresponds to GPS location
  • Type: Nominal
  • Missing values: None specified

Outside_historic_plot

  • Label:
  • 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:
  • Definition: Year measurement was taken
  • Type: Nominal
  • Missing values: None specified

Date

  • Label:
  • Definition: More specific date of measurement
  • Type: Nominal
  • Missing values: None specified

Origin_year

  • Label:
  • Definition: Year of stand initiation. As best 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: Nominal
  • Missing values: None specified

Stand_year

  • Label:
  • Definition: Age of the stand at the time of the plot census in which the tree was measured. Calculated as Measure_year - Origin_year
  • Type: Nominal
  • Missing values: None specified

Common_name

  • Label:
  • Definition: Common/Scientific name of plant species measured
  • Type: Nominal
  • Missing values: None specified

Species_code

  • Label:
  • Definition: A four-character code to represent the common name of the plant species measured. See the "Common_name" column for the full name of a given species code
  • Type: Nominal
  • Missing values: None specified

Old_tag

  • Label:
  • 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. Thus, each row represents a unique measurement of a tree (not a duplicate). 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

LTREB_tag

  • Label:
  • Definition: Tags installed as part of plot census during LTREB intiation 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 (as well as perhaps an old_tag ID).
  • Type: Nominal
  • Missing values: None specified

DBH_cm

  • Label:
  • Definition: Diameter at breast height of tree being measured, in centimeters
  • Type: Nominal
  • Missing values: None specified

As_class

  • Label:
  • Definition: Marks DBH measurements that were taken in the form of a "size class" rather than an actual measurement ("Yes" if size class, "NA" if actual measurement)
  • Type: Nominal
  • Missing values: None specified

AGB_kg

  • Label:
  • Definition: Above ground biomass
  • Type: Nominal
  • Missing values: None specified

Height_stem

  • Label:
  • Definition: Height of stem
  • Type: Nominal
  • Missing values: None specified

Height_dead

  • Label:
  • Definition: Height of dead tree (estimated to the nearest 0.5 m)
  • Type: Nominal
  • Missing values: None specified

Distance

  • Label:
  • Definition: Distance of individual tree from plot center
  • Type: Nominal
  • Missing values: None specified

Azimuth

  • Label:
  • Definition: Compass direction in degrees, with a 6 degree declination
  • Type: Nominal
  • Missing values: None specified

Status

  • Label:
  • Definition: Type of individual (ie dominant, co-dominant, overtopped, dead, etc)
  • Type: Nominal
  • Missing values: None specified

Notes

  • Label:
  • Definition: Field notes
  • 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