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{"Abstract":["This data set contains soil temperature, soil moisture, and soil conductivity data in the vicinity of Palmer Station. TEROS12 sensors are installed in 40 plots that are distributed along an increasing primary productivity gradient (i.e., with increasing distance from the Marr Ice Piedmont glacier). The sensors are comprised of 5 cm long metal pins that are inserted straight down into the soil and hence, data are collected from the upper 0-5 cm of the soil. There are 4 sites along the gradient (site 1 is closest to the glacier and site 4 is farthest from the glacier), with ten plots at each site. Half of the plots at each site are plots that contain an open-top chamber and the other half of the plots are control (unwarmed) plots. Plot ids will contain "W" for warmed plots and "C" for control plots. Raw data from the loggers (logged every 20 minutes), as well as an R Markdown file is provided to facilitate reading in and displaying the daily average soil moisture and temperature data at the plot and at the treatment level for each productivity site. Loggers and sensors were installed in December 2022 and were downloaded in November (sites 2-4) and in December (site 1) of 2024."]}
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Caribou-Poker Creeks Research Watershed (Alaska) Pulse-Amplitude Modulation Fluorometry Needle-Scale Observations (March 2022 - July 2024)
This dataset consists of pulse-amplitude modulation (PAM) fluorometry data collected using six Micro-PAM (Walz GmbH, Effeltrich, Germany) measurement heads installed on two black spruce trees at the Caribou-Poker Creeks Research Watershed National Ecological Observatory Network (NEON) site (site abbreviation: BONA) near Fairbanks, Alaska. These measurements provide information on the physiological status of photosystem II and photosynthesis more broadly for the needles and trees observed. Three PAM measurement heads were installed on each tree at low, intermediate, and high heights qualitatively within the canopy. Five measurement heads (second intermediate position measurement excluded) were installed in March 2022, with the sixth measurement head being installed in July 2022. Data was collected semi-continuously, including the harsh winter season, until July 2024. PAM fluorescence measurements were collected in a ramped scheme centered around noon to maximize measurement frequency while still allowing for adequate dark acclimation for the nighttime measurement. Saturation pulses were performed by each measuring head every fifteen minutes from 9:00AM – 5:00PM, every thirty minutes from 7:00AM-9:00AM and 5:00PM-7:00PM, and every hour from 2:00AM-7:00AM and 7:00PM-9:00PM.
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- PAR ID:
- 10675200
- Publisher / Repository:
- NSF Arctic Data Center
- Date Published:
- Subject(s) / Keyword(s):
- Boreal Forest/Taiga Photosynthesis Evergreen Vegetation Plant Phenology Fluorescence
- Format(s):
- Medium: X Other: text/xml
- Sponsoring Org:
- National Science Foundation
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