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Data in the KBS LTER core database may not be published without written permission of the lead investigator or project director Full terms of use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) was collected from 2009 to 2017. From 2009 to 2013 the data were collected with a Licor LAI-2000 instrument. Since 2013 the data have been collected with an LP-80 Ceptometer.
This datatable is part of the Leaf Area Index on the GLBRC Biofuel Cropping System Experiment dataset.
The leaf area index was measured to estimate the phenology and growth patterns of the different biofuel crops.
Note
| Experiment: | GLBRC Biofuel Cropping System Experiment |
| Data available from: | June 2009 to October 2017 |
| Dataset: | KBS149 |
| Datatable ID: | kbs063-008.10 |
| Core Areas | Primary Production,Disturbance |
| Repository link: | http://doi.org/10.6073/pasta/61777890a6accc607e71546df0329d56 |
| Personnel: |
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| Last Updated | 2024-09-27 |
| Variate | Description | Units |
|---|---|---|
| sample datetime | measurement datetime (UTC) | |
| local datetime | the local time in the eastern time zone. includes eastern standard time and daylight saving time depending on the date. | |
| treatment | experimental treatment | |
| replicate | replicate nested within treatment | |
| direction | plant direction and number | |
| lai | leaf area index | m^2/m^2 |
| sel | standard error of lai | m^2/m^2 |
| difn | fraction of sky visible | |
| mta | mean tilt angle | |
| sem | standard error of MTA | |
| smp | number of sample pairs used | |
| comments | notes on data row | |
| instrument | The instrument used ot measure the 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 of below-canopy PAR measurements | |
| 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. |
Data Excerpt
| sample_datetime | local_datetime | 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 |