GLBRC Sustainability Data Catalog

Poplar Tree Diameters — GLBRC Marginal Land Experiment

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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.


Experiment: GLBRC Marginal Land Experiment
Data available from: October 2016 to October 2023
Dataset: GLBRC126
Datatable ID: GLBRC126-003.123
Core Areas Primary Production
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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

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Data Excerpt

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
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