Overview of information on this Hydroshare page:

Electrodic- and Self-potential (at both the main site and the 4 sites together); soil moisture, temperature and CO2; sap velocity, and meteorological data were collected between July and August 2023, 
as described in the New Phytologist manuscript "Self- and Electrodic-Potential Response to Hydrological and Biogeochemical Processes in the Soil-Tree Continuum".

This work is supported by the Department of Energy grant DE-SC0023312, and the National Science Foundation EAR-2121659. 
H.J. Andrews Experiment forest data and facilities were provided by the H.J. Andrews Experimental Forest and Long-Term Ecological Research (LTER) program, administered cooperatively by Oregon State University, 
the USDA Forest Service Pacific Northwest Research Station, and the Willamette National Forest. This material is based upon work supported by the National Science Foundation under the grant LTER8 DEB-2025755. 


In the Content section here, you will find:

1) NPt-SP-EP.csv & NPt-4sites.csv: 
 Self Potential (SP) and Electrodic Potential (EP) measured in the main site and at the four sites, respectively. The non-polarizable electrodes use for the reference and the SP measurements are SDEC PMS 9000 electrodes (see https://en.sdec-france.com/unpolarizable-electrodes-for-self-potentials-measurements-pms-9000/).
 The EP electrodes are standard stainless steel screws. The measurements were automatically acquired each 10 minutes by a Campbell CR1000 datalogger (https://www.campbellsci.com/cr1000) in a single-ended mode.

2) Sap_velocity.csv:
Trunk and root sap velocity has been measured using the at-ratio method based on heat-pulse velocity because of its ability to detect slow and reverse flows (Burgess et al., 2001). 
This method is based on temperature monitoring with two sets of thermocouples, one downstream and one upstream of the heating element connected to a CR1000 Campbell datalogger. 
The inner sensor sap velocity was processed to adjust the zero-flow offset using a double regression based on the lowest daily sap velocity over the entire length of the data with a 10-day moving window (Merlin et al., 2020). 
The sap velocity was further corrected using the wood and sap thermal properties using Burgess et al. (2001) equation. 

3) Soil_VWC_Temp_CO2.csv:
We installed one Sentek Drill & Drop (Sentek Pty Ltd, Stepney, SA, Australia) soil moisture and temperature sensor, which collected data every 10 cm over 90 cm within 2 m of the monitored tree and the SP electrodes in the soil. 
Soil temperature and volumetric water content (VWC) sensors were installed between June 15th and July 15th, 2023, and all the sensors were reinstalled on July 27th to improve the contact between the sensors and the soil and thus the quality of VWC monitoring. 
The CO2 sensor (GMP252, Vaisala, Helsinki, Finland) was installed 20 cm deep and collected data from July 28th to August 31st. 

4) NPt-Meteorological_PRIMET.csv:
Data from H.J. Andrews Experiment forest PRIMET station: https://andlter.forestry.oregonstate.edu/data/place.aspx?domain=place&dbcode=MS001&placeid=664. 
Data are available here: https://andrewsforest.oregonstate.edu/sites/default/files/lter/data/weather/portal/PRIMET/data/index.html
The data are extracted from two files:
  - a] primet_230_a_5min_2023.csv: SOLAR_MEAN_100_0_01, ATMPRESS_INST_0_0_01
  - b] primet_239_a_5min_2023.csv: SATVP_MEAN_150_0_04, VAP_MEAN_150_0_04, VPD_MEAN_150_0_04, SATVP_MEAN_450_0_01, VAP_MEAN_450_0_01, VPD_MEAN_450_0_01, AIRTEMP_MEAN_150_0_04, WSPD_PRO_MAX_1000_0_01
The metada of these two files are available on H.J. Andrews website.