Leaf Area Index (LAI) — GLBRC Biofuel Cropping System Experiment
Data in the KBS LTER core database may not be published without written permission of the lead investigator or project director Full terms of use
Leaf Area Index data from the KBS GLBRC Intensive Site (BCSE) from 2009 to 2017. From 2009 to 2013 the data was collected with a Licor LAI-2000 meter and since 2013 we have used an AccuPar LP-80 Ceptometer.
This datatable is part of the GLBRC Annual Net Primary Productivity dataset. This dataset contains the aboveground biomass data. Annual net primary production (ANPP) data is measured at peak biomass for a given treatment. Additional ANPP measurements are made where appropriate such as occasional destructive harvests for poplar. See the ANPP protocols for descriptions of the sampling and measurement methods for each of the treatments. Below ground net primary production (BNPP) are available for these same sites.
Note
| Experiment: | GLBRC Biofuel Cropping System Experiment |
| Data available from: | June 2009 to October 2017 |
| Dataset: | GLBRC082 |
| Datatable ID: | GLBRC082-007.160 |
| Repository link: | |
| Related Tables: |
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| Personnel: |
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| Last Updated | 2023-05-23 |
| Variate | Description | Units |
|---|---|---|
| sample date | date and time of measurement, the plus sign indicates the time relative to Universal Coordinated Time (UCT). | |
| local time | the time in the eastern time zone either standard time or daylight saving time depending on the date. | |
| treatment | experimental treatment | |
| replicate | replicate nested within treatment | |
| direction | direction and plant number | |
| lai | leaf area index | m^2/m^2 |
| sel | standard error of lai | m^2/m^2 |
| difn | fraction of sky visible | number |
| mta | mean tilt angle | degree |
| sem | standard error of MTA | degree |
| smp | number of sample pairs used | number |
| comments | notes about the data row | |
| instrument | the instrument used to measure LAI | |
| mean above par | mean PAR above the canopy in micromoles/(m^2 s) | |
| mean below par | mean PAR below the canopy in micromoles/(m^2 s) | |
| tau | ratio between the above and below canopy PAR | dimensionless |
| chi | (leaf distribution parameter): ratio of the projected area of an average canopy element (a leaf, for example) on a horizontal plane to its projection on a vertical plane; the default value for χ is 1.0, which assumes the canopy angle distribution to be spherical. | |
| fb | (fractional beam radiation): ratio of direct beam radiation coming from the sun to radiation gathered from all ambient sources, like the atmosphere, or reflected from other surfaces | |
| zenith angle | angle between the point in the sky directly overhead vertical, called the zenith (0°), and the position of the sun. The angle is calculated based on the global position, time of day, and location | degree |
GLBRC data is not yet publicly available.
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| sample_date | local_time | treatment | replicate | direction | lai | sel | difn | mta | sem | smp | comments | instrument | mean_above_par | mean_below_par | tau | chi | fb | zenith_angle |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2017-10-27 12:52:00 +0000 | 2017-10-27 08:52:00 UTC | G8 | R1 | EP3 | 0.39 | LAI AccuPAR LP-80 Ceptometer | 11.2 | 8.1 | 0.719 | 1.0 | 0.02 | 83.0 | ||||||
| 2017-10-27 12:51:00 +0000 | 2017-10-27 08:51:00 UTC | G8 | R1 | EP1 | 0.67 | LAI AccuPAR LP-80 Ceptometer | 10.9 | 6.1 | 0.56 | 1.0 | 0.02 | 83.0 | ||||||
| 2017-10-27 12:51:00 +0000 | 2017-10-27 08:51:00 UTC | G8 | R1 | EP2 | 0.72 | LAI AccuPAR LP-80 Ceptometer | 11.0 | 6.0 | 0.542 | 1.0 | 0.02 | 83.0 | ||||||
| 2017-10-27 12:50:00 +0000 | 2017-10-27 08:50:00 UTC | G8 | R1 | WP3 | 0.79 | LAI AccuPAR LP-80 Ceptometer | 11.3 | 5.7 | 0.505 | 1.0 | 0.02 | 83.0 | ||||||
| 2017-10-27 12:48:00 +0000 | 2017-10-27 08:48:00 UTC | G8 | R1 | WP2 | 0.79 | LAI AccuPAR LP-80 Ceptometer | 12.1 | 6.2 | 0.51 | 1.0 | 0.02 | 84.0 |