Poplar Tree Diameters — GLBRC Marginal Land 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Data in the KBS LTER core database may not be published without written permission of the lead investigator or project director Full terms of use
Diameter of 10 random poplar trees in the center 2 rows of each split plot measured at 15 cm above the ground in late fall to early winter to estimate annual woody production.
This datatable is part of the Cropping Systems – Marginal Land Experiment dataset.
This dataset contains data on the biofuel cropping systems of the GLBRC Marginal Land Experiment (MLE) originally established in 2013 at north, central and south sites in Wisconsin and Michigan. The experiment consists of six different biofuel cropping systems (a.k.a. treatments); including switchgrass (G5), miscanthus (G6), native grasses (G7), hybrid poplar (G8), early successional (G9), and restored prairie (G10)) plus an historical vegetation control (G11), replicated in each of 4 blocks (R1-R4) at each site. Split-plot treatments were initiated in 2014-2016 to examine the effect of nitrogen fertilization [plus_n (+N) vs control (0N)] on all cropping systems.
Seasonal deployment of rainfall exclusion (rainout) shelters in the fertilized split plot of the switchgrass (G5) treatment began in 2018 to examine the effects of drought on plant growth. See the Marginal Land Rainfall Exclusion Experiment for these data.
Note that Block 1 at the Wisconsin Central – Hancock site was retired in 2015 and the entire Wisconsin South – Oregon site was retired after 2018 growing season when the maintenance, harvest, sampling and analysis of the remaining Wisconsin sites was transferred from UW staff to MSU staff.
Note
| Experiment: | GLBRC Marginal Land Experiment |
| Data available from: | October 2016 to October 2023 |
| Dataset: | GLBRC126 |
| Datatable ID: | GLBRC126-003.128 |
| Core Areas | Primary Production |
| Repository link: | |
| Related Tables: | |
| Personnel: |
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| Last Updated | 2024-01-10 |
| Variate | Description | Units |
|---|---|---|
| sample date | the measurement date | |
| location | the experiment location or site. | |
| plot | the plot sampled | |
| treatment | the treatment sampled | |
| replicate | the replicate sampled | |
| nitrogen addition | the nitrogen addition split-plot | |
| side | The side of the field the sample is taken from. | |
| diameter cm | the diameter of a randomly selected tree at 15 cm above the ground | cm |
| Protocols |
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GLBRC data is not yet publicly available.
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| sample_date | location | plot | treatment | replicate | nitrogen_addition | side | diameter_cm |
|---|---|---|---|---|---|---|---|
| 2022-10-02 | Michigan North - Escanaba | G8R2 | G8 | R2 | +N | E | 3.1 |
| 2022-10-02 | Michigan North - Escanaba | G8R2 | G8 | R2 | +N | E | 3.8 |
| 2022-10-02 | Michigan North - Escanaba | G8R2 | G8 | R2 | +N | E | 4.8 |
| 2022-10-02 | Michigan North - Escanaba | G8R2 | G8 | R2 | +N | E | 2.7 |
| 2022-10-02 | Michigan North - Escanaba | G8R2 | G8 | R2 | +N | E | 10.7 |