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Biomass characteristics of sugar maple and hemlock seedlings to elevated atmospheric levels - data file

Variables
Variables (legacy): 

Species

  • Label: Tree Species
  • Definition: Species of trees sampled using scientific names.
  • Type: Nominal
  • Missing values: None specified

,
Year

  • Label: Year
  • Definition: The year in which the sample was taken.
  • Type: Date/time
  • Date format: YYYY
  • Missing values: None specified

,
Block

  • Label: Block
  • Definition: A given block has to do with the location of the chambers in the field. There were 10 chambers of each treatment and it is a blocked experiment which means that the site was divided into 10 blocks and each block contains one chamber of each treatment. This helps us statistically account for possible variations in light, moisture, etc. across the entire site.
  • Type: Nominal
  • Missing values: None specified

,
ID

  • Label: Tree ID
  • Definition: Unique identifier to distinguish individuals of the same species within the same root box.
  • Type: Nominal
  • Missing values: None specified

,
CO2

  • Label: Carbon Dioxide Treatment Level
  • Definition: Indicates whether the associated plants were grown in at elevated (760 ppm) or ambient (380 ppm) CO2 levels.
  • Type: Code list
  • Codes:
    • C = Elevated Carbon Dioxide Treatment
    • A = Ambient Carbon Dioxide Treatment
  • Missing values: None specified

,
NO2

  • Label: Nitrogen Dioxide Treatment Level
  • Definition: Indicates whether the associated plants were grown in at elevated (40 ppb) or ambient NO2 levels.
  • Type: Code list
  • Codes:
    • N = Elevated NO2 treatment levels
    • A = Ambient NO2 treatment levels
  • Missing values:
    • NA =

,
NO3

  • Label: Nitrate Treatment Level
  • Definition: Indicates whether the associated plants were grown in soils with increased nitrate (NO3-) levels (30 kg N ha-1 yr-1) or at untreated nitrate levels.
  • Type: Code list
  • Codes:
    • F = Elevated NO3- treatment levels
    • A = Ambient NO3- levels
  • Missing values: None specified

,
init_mass

  • Label: Estimated Initial Mass
  • Definition: The Estimated Initial Biomass number is the estimated initial dry weight of the seedling. Ten individual trees were harvested prior to planting and used to develop a relationship between their height, diameter, and dry weight. This relationship was used to estimate the dry weight of the seedlings that were planted.
  • Type: Physical quantity
  • Unit: gram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: 0.01
  • Missing values:
    • NA =

,
leaf_mass

  • Label: Leaf Mass
  • Definition: Dry weight of all leaves on the seedling at the end of the experiment.
  • Type: Physical quantity
  • Unit: gram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: 0.01
  • Missing values:
    • NA =

,
root_mass

  • Label: Root Biomass
  • Definition: Dry weight of seedling roots following experimental treatment.
  • Type: Physical quantity
  • Unit: gram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: 0.01
  • Missing values:
    • NA =

,
stem_mass

  • Label: Stem Biomass
  • Definition: Dry weight of seedling roots following experimental treatment.
  • Type: Physical quantity
  • Unit: gram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: 0.01
  • Missing values:
    • NA =

,
total_mass

  • Label: Total Biomass
  • Definition: Combined dry weight of leaves, roots and stems of seedling at the end of experimental treatment.
  • Type: Physical quantity
  • Unit: gram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NA =

,
root_shoot_ratio

  • Label: Root to Shoot Ratio
  • Definition: Ratio of the dry weight of belowground (root) biomass to the dry weight of aboveground biomass (leaf and stem biomass).
  • Type: Nominal
  • Missing values: None specified

,
num_leaves

  • Label: Number of Leaves
  • Definition: Number of leaves on the plant at the end of the experiment.
  • Type: Nominal
  • Missing values: None specified

,
lfarea

  • Label: Leaf Area
  • Definition: Indicates the calculated area of all leaves on a plant derived from measures of specific leaf mass and total leaf mass
  • Type: Nominal
  • Missing values: None specified

,
SLA

  • Label: Specific Leaf Area
  • Definition: Specifica leaf area: the ratio of leaf area to dry weight.
  • Type: Physical quantity
  • Unit: centimeterSquaredPerGram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: 0.01
  • Missing values: None specified

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