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In-situ Soil Temperature Data (2 and 10 cm) in Agro-forested Areas of St-Marthe and St-Maurice for 2020-21 and 2021-22
Borealis
Roy, Alexandre; Taghipourjavi, Shahabeddin; Kinnard, Christophe — 2024-04-10 In this dataset, In-situ soil temperature measurements were collected for two consecutive years in Agro-forested areas of St-Maurice and St-Marthe located in south Québec (Canada), from mid-October to the end of April, covering the periods of 2020-21 and 2021-22. 8 and 10 temperature plots were instrumented in St-Maurice and St-Marthe, respectively, to monitor soil freeze-thaw (FT) states. At each plot, five soil pits equipped with two soil temperature sensors at near-surface (2 cm) and 10 cm depths were installed along a cross shape with 5 m between each soil pit. We used the standard normal distribution, which is a continuous probability distribution, to determine the probability of soil freezing at each instrumented plot. As part of this dataset, Sentinel1 Interferometric Wide Swath Mode (IW) imagery was used, using both ascending and descending orbits during the time frame of early October to early June, covering the periods of 2020-2021 and 2021-2022. Three change detection algorithms were also calculated to retrieve the FT state for both VV- and VH-polarizations at the studied plots including freeze-thaw index (FTI) algorithm, backscatter differences (Delta), and exponential freeze-thaw algorithm (EFTA). For more detail please refer to the README file in dataset.
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Tree dielectric measurements in a black spruce forest stand
Borealis
Roy, Alexandre — 2021-03-15 Three ruggedized soil moisture sensors (model GS-3; Decagon 302 Devices, Pullman, Washington, USA) were installed directly into 5.6 cm pre-drilled holes (length of probes) within tree trunks, in order to provide a measure tree relative dielectric constant (RDCtree) at Diameter Breast High (DBH). The probes are sensitive to liquid water, as liquid water has a high dielectric constant. The dielectric constant (D) follows ambient temperature in winter, but is near constant when trunks are thawed in the spring (Roy et al., 2020; Matheny et al., 2015).

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(Source Repository: Dataverse de l'Université du Québec à Trois-Rivières) AND (Author: Roy, Alexandre)

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