BADM Standards (Beta): LAI

Template: Veg Cover
Description: Leaf Area Index

LAI Variables

Variable Required Multiple Units Description
LAI R M m2 m-2 Vegetation (Plant, Leaf, Green) Area Index
Leaf Area Index (or other Vegetation Area Index as indicated in LAI_TYPE) at the tower site. Calculated as one half the total leaf area (the one-sided leaf area) per unit ground surface area.

LAI_TYPE R M LIST(LAI_TYPE) Vegetation (Plant, Leaf, Green) Area Index type
Use predefined list to indicate type of Vegetation Area Index. Note that Leaf Area Index is one type of Vegetation Area Index type. See predefined list for definitions.

LAI_CANOPY_TYPE R M LIST(LAI_CANOPY_TYPE) Vegetation (Plant, Leaf, Green) Area Index canopy type
Use predefined list to indicate the type of canopy being described by the LAI measurement. Use Total for non-forest ecosystems. For forest ecosystems, use Total if not reporting separate Overstory and Understory LAI measurements.
LAI_SPP Optional M Scientific name Vegetation (Plant, Leaf, Green) Area Index species (taxa)
Vegetation species being described by the measurement. To enter a plant species, use the scientific name (Genus species Author or Genus Author). Please refer to www.theplantlist.org for current scientific names and authors. If the measurement includes all vegetation present, do not enter a value. Do not use SPP if reporting VEGTYPE.
LAI_VEGTYPE Optional M LIST(VEGTYPE) Vegetation (Plant, Leaf, Green) Area Index vegetation type
Use the predefined list to indicate the type of vegetation being described by the measurement (e.g., Grass, Evergreen Tree, Deciduous Tree, etc). If the measurement includes all vegetation present, do not enter a value. If vegetation type is not in predfined list, enter “Other/Not in list” and describe briefly in Approach. Do not use VEGTYPE if reporting SPP.
LAI_STATISTIC R M LIST(STATISTIC) Vegetation (Plant, Leaf, Green) Area Index statistic
The statistic for the measurement reported. Use predefined list (e.g., mean, min / max, standard deviation, etc). If appropriate, report the type of statistic (e.g., spatial for spatial standard deviation) in STATISTIC_TYPE.
LAI_STATISTIC_TYPE Optional M LIST(STATISTIC_TYPE) Vegetation (Plant, Leaf, Green) Area Index statistic type
The type of statistic reported if appropriate (e.g., spatial). Use predefined list.
LAI_STATISTIC_NUMBER Optional M integer number Number of observations used to determine Vegetation (Plant, Leaf, Green) Area Index statistic
Number of observations (samples / replicates) used to calculate the STATISTIC for the reported measurement.

LAI_CLUMP Optional M decimal number Foilage element clumping index for Vegetation (Plant, Leaf, Green) Area Index measurement
Foliage element clumping index is used to correct optical data estimates of LAI. Use this variable only if the method specified in LAI_METHOD supports clumping correction. For conifers, use needle clumping within shoot.
LAI_METHOD Optional M LIST(LAI_METHOD) Vegetation (Plant, Leaf, Green) Area Index methodology
Method used to quantify the Vegetation (Plant, Leaf, Green) Area Index. Use predefined list. If method is not present, select “Other” and give additional details in LAI_APPROACH.
LAI_APPROACH Optional M free text Vegetation (Plant, Leaf, Green) Area Index measurement approach
Report additional details used to quanity Vegetation (Plant, Leaf, Green) Area Index.
LAI_DATE Ra M YYYYMMDDHHMM Vegetation (Plant, Leaf, Green) Area Index measurement date
Please report the date at the precision known. Allowed reporting precisions are YYYY, YYYYMM, YYYYMMDD, and YYYYMMDDHHMM. For measurements conducted during a campaign or for temporal averages, use DATE_START and DATE_END instead of DATE.
LAI_DATE_START Ra M YYYYMMDDHHMM Start date of Vegetation (Plant, Leaf, Green) Area Index measurment
Start date of a measurement campaign or start date of a temporal average. Please report the date at the precision known. Allowed reporting precisions are YYYY, YYYYMM, YYYYMMDD, and YYYYMMDDHHMM. Do not use DATE_START if DATE is used.
LAI_DATE_END Optional M YYYYMMDDHHMM End date of Vegetation (Plant, Leaf, Green) Area Index measurment
End date of a measurement campaign or end date of a temporal average. Please report the date at the precision known. Allowed reporting precisions are YYYY, YYYYMM, YYYYMMDD, and YYYYMMDDHHMM. Do not use DATE_END if DATE is used.
LAI_DATE_UNC Optional M days Uncertainty in the Vegetation (Plant, Leaf, Green) Area Index measurement date, start date, and/or end date
If uncertainty in the start date differs than end date, report the uncertainty for start date here in DATE_UNC and the uncertainty for end date in Comments.
LAI_COMMENT Optional M free text Vegetation (Plant, Leaf, Green) Area Index comments

 

LAI CANOPY TYPE Options (back to top)

Option Definition
Total Total canopy. Use for non-forest ecosystems or for forest ecosystem if not reporting Overstory and Understory measurement.
Overstory Overstory canopy
Understory Understory canopy

(back to top)

 

LAI METHOD Options (back to top)

Option Definition
ACCUPAR AccUPAR from Decagon Devices
Litterfall Collection of leaves in litterfall traps
SUNSCAN SunScan from Delta-T Devices
SPECTRAL Relation between spectral reflectance and direct measurements
Direct
Hemispherical photo Analog or digital hemispherical photography (DHP)
LAI_2000 LI-COR LI-2000
LAI_2200 LI-COR LI-2200
Lidar Use LAI_APPROACH to describe details of Lidar method used
Other Use LAI_APPROACH to describe the method used

(back to top)

 

LAI TYPE Options (back to top)

Option Definition
LAI Leaf Area Index (includes all the leaves)
PAI “Plant Area Index (includes leaves, stems and other parts of the plants)”
GAI Green Area Index (includes only green leaves)

(back to top)

 

STATISTIC Options (back to top)

Option Definition
Minimum Minimum value
1st Percentile Quantile at 1% of distribution
5th Percentile Quantile at 5% of distribution
10th Percentile Quantile at 10% of distribution
25th Percentile Quantile at 25% of distribution
Median – 50th Percentile Median – Quantile at 50% of distribution
75th Percentile Quantile at 75% of distribution
90th Percentile Quantile at 90% of distribution
95th Percentile Quantile at 95% of distribution
99th Percentile Quantile at 99% of distribution
Maximum Maximum value
Mean Average (mean) value of sample population
Standard Deviation Standard deviation may be reported from a sample population that consists of individual or aggregated samples (observations). If the distinction is important, specify in Comments.
Measurement Uncertainty Report uncertainty as a plus or minus value in the measurement units. For example, enter 1.5 for +/- 1.5 units. Uncertainty may be reported from the instrument’s specifications, determined empirically, or estimated by the tower team. Please describe such details in Approach. For uncertainty values that are better described by a range, a percent, or other, please enter information in Comments.
Single observation Single observation
Expert estimate Estimate made by expert familiar with site

(back to top)

 

STATISTIC_TYPE Options (back to top)

Option Definition
Spatial The statistic indicated is a metric that describes the spatial component of the sample population. For example, use spatial for the standard devation of samples (observations) that represents different locations at the site for the same time period.

(back to top)

 

VEGTYPE Options (back to top)

Option Definition
Grass
C3 Grass
C4 Grass
Grass / Graminoid Grasses, Sedges, Rushes, and other grass-like monocots (member of order Poales)
Crop
Herbaceous Crop
Woody Crop
Tree
Deciduous Tree Trees that shed their entire canopy seasonallly. Drought or cold avoidence are common reasons for deciduousness.
Evergreen Tree Trees that do not seasonally shed their full canopies.
Shrub
Herb / Forb
Annual Herb / Forb
Perennial Herb / Forb
Aerenchymatous Plants
Liana / vine
Succulant Cactus, Euphorbs, including CAM
Non-vascular Moss, lichen
Other/Not in list Only use this option if a major vegetation group is not included already included in the predefined list. If an existing vegetation group is not specific enough, use the existing vegetation option and add details in Approach (rather than using the “Other/Not in list” option).
No vegetation Bare ground, water, or rock. Use only with SPP_PERC_O and SPP_PERC_U
Water Water (perennially submerged ground)

(back to top)