Environmental and gross primary production observations for a mature black spruce site located in central Saskatchewan, Canada

https://doi.org/10.20383/101.0300

Observations are presented here for the late winter / early summer period (March 20 to June 26) for 2019 and 2020 at a mature black spruce site located in central Saskatchewan, Canada. Daily means and standard deviations of the diurnal variability are reported for photosynthetically active radiation (PAR), soil volumetric water content (VWC), soil temperature, air temperature, vapour pressure deficit (VPD) and gross primary production (GPP). The site is equipped with a walk-up scaffold tower, 25m in height. PAR was measured with a Li-COR LI190R installed at the top of the tower; air temperature and relative humidity were measured at 6m height with a Vaisala HMP45C probe housed in a 12-plate Gill radiation shield; soil temperature at 10 cm depth was measured at two locations with Type-T (copper-constantan) thermocouples and averaged; soil VWC at 7.5 cm depth was measured at two locations with Campbell Scientific CS615 probes and averaged; VPD was calculated from air temperature and relative humidity. GPP was calculated from eddy covariance measurements of net ecosystem exchange (NEE) using a Campbell Scientific CSAT3 sonic anemometer in combination with a Li-Cor LI7200 infrared gas analyzer installed at the top of the tower. NEE was then partitioned into GPP and total ecosystem respiration (Re). The eddy covariance system was not operational in 2019, so GPP is only reported for 2020. PAR data were recorded at 1 second resolution and averaged into 30-minute time bins to compare with other environmental variables, then averaged for daily resolution. All other variables were recorded at a 30-minute time resolution and averaged for daily resolution.

Pierrat, Z., Johnson, B., Helgason, W., Barr, A., Stutz, J. (2021). Environmental and gross primary production observations for a mature black spruce site located in central Saskatchewan, Canada [Dataset]. Federated Research Data Repository. https://doi.org/10.20383/101.0300

1. Description of methods used for collection/generation of data:
PAR was measured above the canopy with a Li-COR LI190R quantum sensor; air temperature and relative humidity were measured at 6m height (mid-canopy) with a Vaisala HMP45C probe; soil temperature at 10 cm depth was measured at two locations with Type-T (copper-constantan) thermocouples and averaged; soil VWC at 7.5 cm depth was measured at two locations with Campbell Scientific CS615 probes and averaged; VPD was calculated from air temperature and relative humidity at 6m height. GPP was calculated from eddy covariance measurements of net ecosystem exchange (NEE) using a Campbell Scientific CSAT3 sonic anemometer in combination with a Li-Cor LI7200 infrared gas analyzer installed above the canopy.

2. Methods for processing the data:
Data was recorded at a 30 minute time resolution and then averaged to create daily means and standard deviations. NEE was partitioned into GPP and total ecosystem respiration (Re) using the standard Fluxnet Canada methods (Barr et al., 2004). The eddy covariance system was not operational in 2019, so GPP is only reported for 2020.

Barr, A.G., Black, T.A., Hogg, E.H., Kljun, N., Morgenstern, K., Nesic, Z., 2004. Inter-annual variability in the leaf area index of a boreal aspen-hazelnut forest in relation to net ecosystem production. Agric. For. Meteorol. 126, 237-255. https://doi.org/10.1016/j.agrformet.2004.06.011

3. Instrument- or software-specific information needed to interpret the data: N/A

4. Standards and calibration information, if appropriate:
Standard FluxNet-Canada protocols were adopted in the collection and processing of data.

5. Environmental/experimental conditions: N/A

6. Describe any quality-assurance procedures performed on the data: N/A

Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

Data is available for download from https://doi.org/10.20383/101.0300