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FASET and DIRT Stem Census

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Variables
Tag
  • Label: Tree Tag
  • Definition: Unique tag value assigned at the start of data collection
  • Type: Nominal
  • Missing values: None specified
X_Coordinate
  • Label: Stem X Coordinate
  • Definition: X coordinate of stem in coordinate system NAD 1927 StatePlane Michigan Central FIPS 2112
  • Type: Physical quantity
  • Unit: Foot_US
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NA = not collected
Y_Coordinate
  • Label: Stem Y Coordinate
  • Definition: Y coordinate of stem in coordinate system NAD 1927 StatePlane Michigan Central FIPS 2112
  • Type: Physical quantity
  • Unit: Foot_US
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NA = not collected
Species_Code
  • Label: Species code
  • Definition: 4-letter code of tree species
  • Type: Nominal
  • Missing values: None specified
Species
  • Label: Species Name
  • Definition: Full name of the species of the tree
  • Type: Nominal
  • Missing values: None specified
Status
  • Label: Status of the tree
  • Definition: Status of the tree - live, dead, or moribund
  • Type: Code list
  • Codes:
    • L = live
    • D = dead
    • M = moribund
  • Missing values:
    • NA = not collected
Canopy_Position
  • Label: Canopy Position
  • Definition: Tree's position in the forest canopy
  • Type: Code list
  • Codes:
    • U = understory
    • OS = overstory subdominant
    • OD = overstory dominant
  • Missing values:
    • NA = not collected
DBH_cm
  • Label: DBH
  • Definition: Diameter at breast height in cm
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NA = not collected
Site
  • Label: Site code
  • Definition: Identifier for plot tree was measured in
  • Type: Code list
  • Codes:
    • DIRTq1 = DIRT study site - quarter 1
    • DIRTq3 = DIRT study site - quarter 3
    • FASETa = FASET study site - plot near D2 intensive site
    • FASETb = FASET study site - plot near B1 intensive site
  • Missing values: None specified
Measurement_Year
  • Label: Measurement Year
  • Definition: Year that the tree was measured
  • Type: Date/time
  • Date format: YYYY
  • Missing values: None specified
Point_X_michgeoref_m
  • Label: Point_X_michgeoref_m
  • Definition: x coordinate in michigan georef coordinate system in meters
  • Type: Nominal
  • Missing values: None specified
Point_Y_michgeoref_m
  • Label: Point_Y_michgeoref_m
  • Definition: y coordinate in Michigan georef coordinate system in meters
  • Type: Nominal
  • Missing values: None specified
Point_X_Longitude
  • Label: Point_X_Longitude
  • Definition: x coordinate in Longitude format
  • Type: Nominal
  • Missing values: None specified
Point_Y_Latitude
  • Label: Point_Y_Latitude
  • Definition: y coodinate in Latitude
  • Type: Nominal
  • Missing values: None specified
Methods: 
  1. A 100mx100m grid was set using an engineers level and measuring tape. 18" long sections of 1/2" PVC pipe were labeled with the corresponding vertex number and pounded into the ground 10 m apart to create the grid.

  2. All stems with a diameter at breast height (approximately 1.37m) of 1.0 cm or greater were tagged. Tags were placed on the eastern side of the trees approximately 10cm below breast height (1.27m). Trees that were previously tagged with long tags as part of DIRT research or the Forest Ecology class (2005) were retagged and the old tag numbers were noted. Trees that were previously tagged with round tags were simply re-recorded. Most tags number between 1555 and 3228. Stems were considered unique if branching occured anywhere below breast height. Species , status, canopy position, and comments pertaining to the individual trees were also recorded (see notes below).

  3. Tree location was determined by recording the angle and distance of the center of the base of each stem from the center of a 20m x 20m section. A coordinate system transformation was then performed to give each stem a location in a cartesian coordinate system. The 0,100 location corresponds to the most southwestern corner of the quarter.

Additional Information

FieldValue
mimetypetext/csv
filesize1.47 MB
resource typefile upload
timestampSep 01, 2021