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Understory and Overstory Trees of Nichols Arboretum (1998-1999)

Location

Nichols Arboretum
1610 Washington Heights, Ann Arbor, MI 48104
United States
US
Data preview unavailable.
Variables
Phys_sys
  • Label: Physiographic System
  • Definition: The physiographic system of the plot.
  • Type: Code list
  • Codes:
    • 1 = Morraine
    • 2 = Ice-Contact Terrain
    • 3 = Outwash Plain (and related meltwater channel features)
  • Missing values: None specified
Landform
  • Label: Landform
  • Definition: The landform of the plot.
  • Type: Code list
  • Codes:
    • 1 = End Morraine
    • 2 = End Morraine over Proglacial outwash
    • 3 = Reworked End Morraine
    • 4 = Crevasse Filling
    • 5 = Kame
    • 6 = Valley Floor
    • 7 = Cut Bank
    • 9 = River Floodplain
  • Missing values: None specified
Ecosystem
  • Label: Landscape Ecosystem Type
  • Definition: The landscape ecosytem type of the plot.
  • Type: Code list
  • Codes:
    • 1 = Moderately well drained clay loam on moderate to steep slopes; Black oak - white oak - northern red oak - pignut hickory/Thalictrum
    • 2 = Moderately well drained clay loam in a moderately sloping ravine; Northern red oak - shagbark hickory/Euonymus, Caulophyllum
    • 3 = Moderately well drained clay loam over sand (sand with 200cm) on gentle to moderate upper slopes; Black oak - white oak - pignut hickory/Thalictrum
    • 4 = Moderately well drained loam on moderately sloping middle and lower slopes; Black oak - white oak - northern red oak - pignut hickory - shagbark hickory/Thalictrum, Geranium, Collinsonia
    • 5 = Moderately well drained sandy loam over clay loam in a gently sloping ravine; Northern red oak - shagbark hickory/Pyrola
    • 6 = Well drained to moderately well drained sandy loam to clay loam in a steeply sloping ravine, influenced by postglacial erosion; Black oak - white oak - northern red oak - pignut hickory - shagbark hickory/Corylus, Thalictrum
    • 7 = Somewhat excessively drained gravelly sandy loam over coarse sand and gravel on moderate slopes; Black oak/Rhus aromatica
    • 8 = Well drained to somewhat excessively drained sandy loam on steep, south-facing slopes and ridgetops; Black oak - white oak - pignut hickory/Viburnum rafinesquianum, Carex pensylvanica
    • 9 = Well drained to somewhat excessively drained sandy loam on steep, north-facing middle and lower slopes; Black oak - white oak - northern red oak - pignut hickory/Viburnum rafinesquianum
    • 10 = Somewhat excessively drained fine sand on a moderatley sloping rise; Black oak/Rhus aromatica
    • 11 = Well drained sandy loam to fine loamy sand over silt on a gently sloping rise; White oak - northern red oak - pignut hickory/Smilacina
    • 12 = Well drained sandy loam on flat terrain, water table below 300 cm (water table within 200 cm in a former drainageway); White oak - black oak - northern red oak - pignut hickory/Thalictrum, Smilacina
    • 13 = Moderately well drained loam to silt loam on flat terrain, depth to water table 150-300 cm; Bur oak - white ash - basswood - bitternut hickory - shagbark hickory/Euonymus, Actaea, Caulophyllum, Geranium, Dentaria
    • 14 = Somewhat poorly drained loam to silt loam in a gently sloping drainageway, depth to the water table less than 150 cm; American elm - red ash - silver maple - black willow - eastern cottonwood (bur oak - basswood - shagbark hickory on rises)/Senecio, Symplocarpus
    • 15 = Well drained to somewhat excessively drained sandy loam on steep slopes; Black oak - white oak - northern red oak - pignut hickory - shagbark hickory/Corylus
    • 16 = Well drained to somewhat excessively drained sandy loam over gravel on flat terrain, depth to gravel more than 100 cm; Bur oak/Andropogon"
    • 17 = Well drained to somewhat excessively drained sandy loam over gravel on flat terrain, depth to gravel less than 100 cm; Bur oak/Schizachyrium"
    • 18 = Moderately well drained to somewhat poorly drained loam to silt loam on flat first bottom, water table within 100 cm; American elm - red ash - silver maple/Asarum, Ribes americanum
    • 19 = Moderately well drained sandy loam on a moderately sloping riser; Bur oak - white ash - bitternut hickory - basswood - shagbark hickory/Viburnum lentago, Zanthoxylum
  • Missing values: None specified
Plot
  • Label: Plot
  • Definition: Plot number (1-38)
  • Type: Nominal
  • Missing values: None specified
Subplot
  • Label: Subplot
  • Definition: Section of subdivided plot.
  • Type: Code list
  • Codes:
    • 1 = NE
    • 2 = NW
    • 3 = SE
    • 4 = SW
  • Missing values: None specified
Species
  • Label: Species
  • Definition: The species of the genus.
  • Type: Nominal
  • Missing values: None specified
Genus
  • Label: Genus
  • Definition: The genus of the vegetation.
  • Type: Nominal
  • Missing values: None specified
Type
  • Label: Ecosystem Type
  • Definition: The ecosystem type (see attached table).
  • Type: Nominal
  • Missing values: None specified
Story
  • Label: Story
  • Definition: The classification of the story based upon the vegetation's dbh.
  • Type: Code list
  • Codes:
    • Story 1 = Overstory (=> 9.0 cm dbh)
    • Story 2 = Understory (= 1.5 - 9.0 cm dbh)
  • Missing values: None specified
DBH
  • Label: Diameter at Breast Height
  • Definition: The diameter of the tree at breast height in centimeters.
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
BA
  • Label: Basal Area
  • Definition: BA= 0.00007854*(dbh^2)
  • Type: Physical quantity
  • Unit:
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
SumBA
  • Label: Sum of Basal Area
  • Definition: SumBA=sum(BA)
  • Type: Physical quantity
  • Unit:
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
NStems
  • Label: Number of Stems
  • Definition: The vegetation's number of stems.
  • Type: Nominal
  • Missing values: None specified
Den
  • Label: Relative Density
  • Definition: Den = 1/Nstems
  • Type: Nominal
  • Missing values: None specified
Dom
  • Label: Relative Dominance
  • Definition: Dom = BA/SumBA
  • Type: Nominal
  • Missing values: None specified
Methods: 

A systematic random method was used to locate thirty-eight 10 x 20 m plots. Plots were subdivided into four 5 x 10 m subplots. After locating an area of relatively homogenous forest canopy coverage, a compass was spun to determine the azimuth and distance to the northeast corner of the plot. This corner was marked with a permanent stake, and the azimuth and distance to the stake from a witness tree were recorded.
Three size classes were determined for all tree species: overstory (dbh > 9.1 cm); understory (1.5-9.0 cm dbh); and ground cover (<1.5cm dbh); and the species and dbh to the nearest 0.1 cm were recorded for all live and dead standing overstory and understory trees. Physiographic system, landform, type, and ecosystem were recorded (See attached documents).

The following values were calculated:
Basal Area: BA= 0.00007854*(dbh*dbh)
Sum of Basal Area: SumBA=sum(BA)
Relative Density: Den = 1/Nstems
Relative Dominance: Dom = BA/SumBA

Additional Information

FieldValue
mimetypetext/csv
filesize200.89 KB
resource typefile upload
timestampJan 27, 2020