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 |
|---|---|---|---|
| Get a related visualization | JPG | 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). | Open resource |
| View documentation related to this dataset | HTML | ORNL DAAC Data Set Documentation | Open resource |
| Download this dataset | HTML | This link allows direct data access via Earthdata login | Open resource |
| View documentation related to this dataset | Niwot Ridge Ameriflux Tower Conifer Needle PAM Fluorescence Emission, 2017-2018: Niwot_Ridge_CNPAM_Fluorescence.pdf | Open resource | |
| This dataset's landing page | HTML | Data set Landing Page DOI URL | Open resource |
| Google Scholar search results | HTML | Search results for publications that cite this dataset by its DOI. | Open resource |