Canopy species and height — GLBRC Switchgrass Nitrogen Rate Experiment
Data in the KBS GLBRC core database may not be published without written permission of the lead investigator or project director Full terms of use
Canopy species composition and height is surveyed at or near maturity of the dominant plant species using the Line-Point Intercept (LPI) .
This method is used to quantify changes in dominant plant species by measuring their canopy cover and height. It involves lowering a pin or rod at regular intervals along transects and recording the first plant species intercepted. Percent cover for each species is calculated from the number of hits divided by total sampling points, allowing researchers to track shifts in dominance over time
This datatable is part of the Switchgrass Nitrogen Rate Experiment dataset.
This dataset contains data from the Switchgrass Nitrogen Rate Experiment (formerly Nitrogen/Harvest) at the KBS GLBRC Intensive Field Site. Switchgrass is grown under 8 rates of nitrogen fertilization (F1-F8; 0-196 kg N/ha) with each treatment plot replicated in four blocks (R1-R4). From 2010–2012, the experiment also included split plots with two harvest strategies (H1, H2; 1 vs 2 harvests/yr) for each nitrogen treatment; from 2013 onward all split plots are harvested only once in the fall, with yields measured separately 2013-2022 and combined starting in 2023.
Note
| Experiment: | GLBRC Switchgrass Nitrogen Rate Experiment |
| Data available from: | September 2024 |
| Dataset: | GLBRC132 |
| Datatable ID: | GLBRC132-008.162 |
| Repository link: | |
| Related Tables: |
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| Personnel: |
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| Last Updated | 2026-03-05 |
| Variate | Description | Units |
|---|---|---|
| sample date | the date of the observation | |
| site | the experiment/site | |
| treatment | the treatment code | |
| replicate | the replicate plot | |
| species | the species observed | |
| height | the height of the species observed | cm |
| has lodged | an observational scoring. True if the plant was considered "lodged" | |
| comment | any comments about the observation |
| Protocols |
|---|
| Canopy Species Composition and Height - Line-point Intercept Method |
| GLBRC Switchgrass Nitrogen Rate Experiment – Sampling |
GLBRC data is not yet publicly available.
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| sample_date | site | treatment | replicate | species | height_cm | has_lodged | comment |
|---|---|---|---|---|---|---|---|
| 2024-09-09 | Switchgrass N Rate | SNR1 | R1 | Andropogon gerardii | 178.0 | false | |
| 2024-09-09 | Switchgrass N Rate | SNR1 | R1 | Bromus sp. | 69.0 | false | |
| 2024-09-09 | Switchgrass N Rate | SNR1 | R1 | Monarda fistulosa L. | 95.0 | false | |
| 2024-09-09 | Switchgrass N Rate | SNR1 | R1 | Muhlenbergia schreberi J.F.Gmel. | 65.0 | false | |
| 2024-09-09 | Switchgrass N Rate | SNR1 | R1 | Panicum clandestinum | 62.0 | false |