Conifer Needle Chlorophyll Fluorescence, Niwot Ridge, Colorado, USA, 2017-2018

Description

This dataset provides chlorophyll fluorescence measurements made on pine and spruce needle tissues at the Niwot Ridge AmeriFlux Core site (US-NR1) near Nederland, Colorado, USA, during the summers of 2017 and 2018. Two types of measurements were made using pulse-amplitude-modulation (PAM) fluorometry: the photosystem II (PSII) operating efficiency in the light (Fq'/Fm' at variable light levels), and the maximum quantum efficiency of PSII photochemistry (Fv/Fm) on dark-acclimated tissues. Chlorophyll fluorescence measurements were made to determine seasonality of photosynthetic performance at the needle level.

Resources

Name Format Description Link
21 This link allows direct data access via Earthdata login https://daac.ornl.gov/cms/Niwot_Ridge_CNPAM_Fluorescence/
21 ORNL DAAC Data Set Documentation https://daac.ornl.gov/CMS/guides/Niwot_Ridge_CNPAM_Fluorescence.html
21 Data set Landing Page DOI URL https://doi.org/10.3334/ORNLDAAC/1722
33 Niwot Ridge Ameriflux Tower Conifer Needle PAM Fluorescence Emission, 2017-2018: Niwot_Ridge_CNPAM_Fluorescence.pdf https://data.ornldaac.earthdata.nasa.gov/public/cms/Niwot_Ridge_CNPAM_Fluorescence/comp/Niwot_Ridge_CNPAM_Fluorescence.pdf
22 Chlorophyll a+b concentration relative to dry mass (green), maximum quantum efficiency (Fv/Fm) measured with a fluorimeter (blue), and dark-adapted xanthophyll cycle conversion state (purple) ([Zeaxanthin+Antheraxanthin]/[Violaxanthin+Antheraxanthin+Zeaxanthin]) sampled at monthly intervals. All needle leaf measurements represent the mean and 1 SE of both Engelmann spruce and lodgepole pine samples during each 2 - 3 day sampling period. Refer to the related datasets for pigment concentrations. Figure from Magney et al. (2019). https://daac.ornl.gov/CMS/guides/Niwot_Ridge_CNPAM_Fluorescence_fig1.jpg
21 Search results for publications that cite this dataset by its DOI. https://scholar.google.com/scholar?q=10.3334%2FORNLDAAC%2F1722

Tags

  • ecosystems
  • biosphere
  • vegetation
  • ecological-dynamics
  • earth-science

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