Leaf Area Index every 15 cm of 1m x 1m chamber flux and point frame plots and sites where dataloggers monitored PAR above, within and below S. pulchra and B. nana canopies during the growing season at the Toolik Field Station in AK, Summer 2012.
Variables
YEAR
- Label: YEAR
- Definition: year of measurement
- Type: Date/time
- Date format: YYYY
- Missing values: None specified
DATE
- Label: DATE
- Definition: Date measurement was made
- Type: Date/time
- Date format: dd-mmm-yy
- Missing values: None specified
SITE
- Label: SITE
- Definition: Toolik
- Type: Nominal
- Missing values: None specified
GROUP
- Label: GROUP
- Definition: Measurement location in relation to Toolik Lake LTER Shrub plots; In vicinity of Block1 =Upland, IVO Block 2 =Outlet
- Type: Nominal
- Missing values: None specified
PLOT
- Label: PLOT
- Definition: Individual plot identifier
- Type: Nominal
- Missing values: None specified
TREAT
- Label: TREAT
- Definition: none or fertilised annually (FERT) (with N and P)
- Type: Nominal
- Missing values: None specified
MEASUREMENT TYPE
- Label: MEASUREMENT TYPE
- Definition: Distinguishes chamber flux (CH) and point frame (PF) measurements
- Type: Nominal
- Missing values: None specified
PLOT SIZE
- Label: PLOT SIZE
- Definition: 1m x 1m chamber or point frame size
- Type: Nominal
- Missing values: None specified
DOM VEG
- Label: DOM VEG
- Definition: Dominant canopy vegetation
- Type: Nominal
- Missing values: None specified
TIME
- Label: TIME
- Definition: 24-hour time measurement was taken
- Type: Date/time
- Date format: HH:MM:SS
- Missing values: None specified
TRANSMITTED
- Label: TRANSMITTED
- Definition: light fraction that passes through the canopy (umol PAR transimitted per umol PAR above canopy)
- Type: Physical quantity
- Unit: micromolePerMole
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- #N/A = Missing or Not Measured
SPREAD
- Label: SPREAD
- Definition: Standard deviation of the 64-PAR sensors (umol PAR per meter square ground per second)
- Type: Physical quantity
- Unit: micromolePerMeterSquaredPerSecond
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- #N/A = Missing or Not Measured
INCIDENT
- Label: INCIDENT
- Definition: Incident radiation measured on BF3 sensor (umol PAR per meter squared per second)
- Type: Physical quantity
- Unit: micromolePerMeterSquaredPerSecond
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- #N/A = Missing or Not Measured
BEAM FRACTION
- Label: BEAM FRACTION
- Definition: Fraction of light that is a direct beam (umol direct PAR per umol total PAR)
- Type: Physical quantity
- Unit: micromolePerMole
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- #N/A = Missing or Not Measured
ZENITH ANGLE
- Label: ZENITH ANGLE
- Definition: angle of the sun above the horizon - estimated based on latitude and time of day
- Type: Physical quantity
- Unit: degree
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- #N/A = Missing or Not Measured
LAI
- Label: LAI
- Definition: leaf area index measured with SunScan wand (square meter leaf per square meter ground)
- Type: Physical quantity
- Unit: meterSquaredPerMeterSquared
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- #N/A = Missing or Not Measured
HEIGHT FROM GROUND
- Label: HEIGHT FROM GROUND
- Definition: height in centimeters of the SunScan wand from ground in cm
- Type: Nominal
- Missing values: None specified
LIGHT CONDITION
- Label: LIGHT CONDITION
- Definition: Description of the light condition during measurement
- Type: Nominal
- Missing values: None specified
ROW / NOTES
- Label: ROW / NOTES
- Definition: Row number indicating repetition number (1-3) or comments about the measurement
- Type: Nominal
- Missing values: None specified