Switchgrass Stand Counts — Switchgrass Nitrogen Fixation 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Data in the KBS LTER core database may not be published without written permission of the lead investigator or project director Full terms of use
Stand counts of switchgrass populations of the Switchgrass Nitrogen Fixation Experiment periodically conducted in the spring to assess growth and recruitment.
This datatable is part of the Switchgrass Nitrogen Fixation Experiment dataset.
This dataset contains data from the Switchgrass Nitrogen Fixation Experiment established in 2016 after conversion of the historically tilled plots (1-16) of the Interactions Experiment from annual crops to switchgrass (Cave-in-rock). The experiment maintained the fertilizer treatment (fertilized and not fertilized) of the Interactions Experiment, but the tillage treatment was discontinued because switchgrass is a perennial crop that is not tilled. From 2018-2022, a rainout shelter experiment that also used buried mesocosms was conducted in the legacy no-till, no fertilizer plots (3, 6, 8, and 9) to examine the effect of soil wetting/drying regimes on the relationship between associative nitrogen fixation (ANF) and switchgrass phenology, diazotroph communities, and nifH expression. The experiment was retired after the 2022 growing season in order to establish the Switchgrass Biodiversity Experiment.
Note
| Experiment: | Switchgrass Nitrogen Fixation Experiment |
| Data available from: | April 2020 to October 2021 |
| Dataset: | KBS152 |
| Datatable ID: | KBS128-004.12 |
| Core Areas | Populations |
| Repository link: | |
| Related Tables: | |
| Personnel: |
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| Last Updated | 2024-05-06 |
| Variate | Description | Units |
|---|---|---|
| year | sample year | |
| sample date | ||
| site | ||
| experiment | ||
| plot | ||
| station | the station with the plot that was sampled, This indicates the location within the plot | |
| average stand count m2 | stand count estimated by the Vogel and Masters 2001grid method | number/m^2 |
| legacy tillage treatment | ||
| fertilization | F: fertilized; N: not-fertilized |
| Protocols |
|---|
| Stand Counts – Perennials |
Data Excerpt
| year | sample_date | site | experiment | plot | station | stand_count_m2 | legacy_tillage_treatment | fertilization |
|---|---|---|---|---|---|---|---|---|
| 2022 | 2022-05-24 | KBS LTER | Switchgrass Nitrogen Fixation Experiment | 1 | center | 39.6 | CT | F |
| 2022 | 2022-05-24 | KBS LTER | Switchgrass Nitrogen Fixation Experiment | 1 | north-east | 40.0 | CT | F |
| 2022 | 2022-05-24 | KBS LTER | Switchgrass Nitrogen Fixation Experiment | 1 | south-west | 39.6 | CT | F |
| 2022 | 2022-05-31 | KBS LTER | Switchgrass Nitrogen Fixation Experiment | 10 | center | 40.0 | NT | F |
| 2022 | 2022-05-31 | KBS LTER | Switchgrass Nitrogen Fixation Experiment | 10 | north-east | 40.0 | NT | F |