------------------- GENERAL INFORMATION ------------------- 1. Title of Dataset South Fork Caspar Creek Understory Evapotranspiration Data - 2019 2. Author Information Shelby R Hammerschmidt Salli F Dymond Principal Investigator Contact Information Name: Salli F Dymond Institution: University of Minnesota Duluth Address: 217 Heller Hall, 1114 Kirby Dr., Duluth, MN 55812 Email: sdymond@d.umn.edu ORCID: 0000-0001-7160-7705 3. Date of data collection (single date, range, approximate date) 2019-05-15 through 2019-08-15 4. Geographic location of data collection (where was data collected?): South Fork Caspar Creek Watershed, Mendocino County, CA, USA 5. Information about funding sources that supported the collection of the data: NSF-EAR-1807165 USDA Forest Service Pacific Southwest Research Station California Department of Forestry and Fire Protection -------------------------- SHARING/ACCESS INFORMATION -------------------------- 1. Licenses/restrictions placed on the data: CC0 1.0 Universal 2. Links to publications that cite or use the data: Hammerschmidt, S. R., Dymond, S. F., Feng, X., Savage, J. A., & Wagenbrenner, J. W. Understory transpiration rates following harvesting in a coast redwood forest. In review. 3. Recommended citation for the data: Hammerschmidt, Shelby R; Dymond, Salli F. (2020). South Fork Caspar Creek Understory Evapotranspiration Data - 2019. Retrieved from the Data Repository for the University of Minnesota, https://doi.org/10.13020/11c7-vc76. --------------------- DATA & FILE OVERVIEW --------------------- 1. File List A. Filename: ET_master.csv Short description: Understory plant evapotranspiration rates and site data. 2. Are there multiple versions of the dataset? no -------------------------- METHODOLOGICAL INFORMATION -------------------------- 1. Description of methods used for collection/generation of data: Evapotranspiration (ET) rates of individual plants were measured using a portable, rapid transpiration chamber outfitted with a relative humidity and temperature sensor. 2. Methods for processing the data: Relative humidity and temperature vs. time was collected inside the chamber for the ET measurement of each plant. This was converted into a csv file and plugged into a R code to calculate max ET rate for each plant individually. ET rate was found by converting RH into absolute humidity, finding the maximum slope (largest increase in absolute humidity over a 10 second interval), and plugging this slope into an equation which takes into account the volume of the chamber and converts the rate into mm/day: ET rate = 86.4 * (MVC/A), where M is the maximum slope in g/m3s, V is the volume of the chamber in m3, C is the chamber calibration factor, A is the area of the chamber on the ground in m2, and 86.4 is a unit conversion factor. 3. Instrument- or software-specific information needed to interpret the data: The chamber used for this experiment was constructed by the author. It consists of PVC frame and polyethylene plastic sheeting. It covers an area of 0.66 m2 on the ground and has a total volume of 0.32 m2. ET rates were calculated assuming that the chamber was completely hydrophobic and did not absorb any moisture (Calibration factor = 1). The chamber was fitted with a HOBO Pro v2 Temperature/Relative Humidity data logger (Onset Computer Corporation, Bourne, MA, USA) which recorded temperature and relative humidity every 10 seconds. Additionally, a HOBO Pendant Temperature/Light sensor was suspended from the top of the frame to record light intensity (in lux) within the chamber every 30 seconds. Two brushless fans were present inside the chamber to mix the air. 4. Standards and calibration information, if appropriate: N/A 5. Environmental/experimental conditions: Measurements were taken on understory plants in four watersheds within a coast redwood forest. The four watersheds had been recently harvested to varying degrees of intensity (0%, 35%, 55%, and 75% reduction in initial basal area). The region has a Mediterranean climate and measurements were taken in June and July. 6. Describe any quality-assurance procedures performed on the data: The data time series were graphed and reviewed for anomalies before analysis. 7. People involved with sample collection, processing, analysis and/or submission: Shelby Hammerschmidt Salli Dymond Julia Petreshen (measurements and sample collection) Peter Rowland (measurements and sample collection) Jeremiah Steuterman (measurements and sample collection) ----------------------------------------- DATA-SPECIFIC INFORMATION FOR: ET_master.csv ----------------------------------------- 1. Number of variables: 17 2. Number of cases/rows: 237 3. Missing data codes: Code/symbol: NA Definition: data not available due to sensor malfunction or related reason 4. Variable List A. Name: CODE Description: 5 digit code unique to each understory plant. First character is the first letter of the watershed name. second character is the plot number. The last number is the plant ID number B. Name: WS Description: Watershed code. TRE is Treat (35% targeted basal area reduction rate), UQL is Uqlidisi (55% reduction), WIL is Williams (0% reduction - control watershed), ZIE is Ziemer (75% reduction) C. Name: TOPO Description: topographic position/plot number. 1 is the riparian zone, 2 is the toeslope, 3 is the sideslope, 4 is the shoulder, 5 is the summit. Each watershed has 5 plots for a total of 20 plots. D. Name: SP Description: Species. - DF: Deer Fern (Struthiopteris spicant) - EHB: Evergreen Huckleberry (Vaccinium ovatum) - RW: Redwood (Sequoia sempervirens) - SF: Sword Fern (Polystichum munitum) - TO: Tanoak (Lithocarpus densiflorus) E. Name: DATE Description: date of ET rate measurement. There were two rounds of measurements - one in early June, and one in late July F. Name: WS.TIME Description: actual time of measurement. Times are in "watershed time", meaning they do not account for daylight savings G. Name: ET.RATE Description: instantaneous evapotranspiration rate of plant calculated from individual HOBO files of RH and temp vs. time (measured using a HOBO Pro v2 Temperature/Relative Humidity data logger); in mm/day H. Name: VWC Description: volumetric water content, in %, measured in the upper 20 cm of soil at the time of ET measurements using a Campbell Scientific HydroSense soil moisture probe (Campbell Scientific, Inc., Logan, UT, USA) . VWC was measured upslope, sideslope, and downslope within 6 inches of each plant and averaged, when possible. For stump sprouts, VWC was measured upslope, sideslope, and downslope of the stump. For some measurements, VWC in sthe surrounding soil was instead determined gravimetrically due to a sensor malfunction. I. Name: LA.or.BM Description: leaf area (for sprouts) in cm2 or biomass (for ferns) in g. J. Name: ELEV Description: plot elevation, in meters K. Name: ASPECT Description: plot aspect, in degrees L. Name: PER.HARVEST Description: actual reduction in canopy basal area within the plot, in percent M. Name: BA_m Description: residual canopy basal area of plot, in m2 N. Name: PAR Description: photosynthetically available radiation, in uE; forest service data taken at the plot scale at the closest 10 minute interval O. Name: LI Description: light intensity inside the chamber at the time of measurement; in lux; recorded using a HOBO Pendant Temperature/Light sensor P. Name: TEMP Description: temperature inside the chamber at the time of measurement; in degrees C; recorded using a HOBO Pro v2 Temperature/Relative Humidity data logger