Description
This dataset provides concentrations of pigments in pine and spruce needle tissues collected at the Niwot Ridge AmeriFlux Core site (US-NR1) near Nederland, Colorado, USA, during the summers of 2017 and 2018. Pigments measured included Chlorophyll A and B, Violaxanthin, Antheraxanthin, Zeaxanthin, Neoxanthin, Lutein, and beta-Carotene. Measurements were made on sun foliage from two canopy-access towers near the main flux tower, and in the laboratory on branches collected from those towers, every 4-8 weeks over the annual cycle. Due to canopy structure, a limited number of trees were accessible from the towers, preventing extensive replication. Pigments were extracted in acetone and analyzed by HPLC. The measurements were made to evaluate seasonal changes associated with the down-regulation of photosynthesis.
Resources
| Name | Format | Description | Link |
|---|---|---|---|
| Get a related visualization | JPG | Reported pigments Chlorophyll a+b concentration relative to dry mass (green) and dark-adapted xanthophyll cycle conversion state (purple) ([Zeaxanthin+Antheraxanthin]/ [Violaxanthin+Antheraxanthin+Zeaxanthin]) sampled at monthly intervals. All needleleaf measurements represent the mean and 1 SE of both Engelmann spruce and lodgepole pine samples during each 2- to 3-d sampling period. (Fv/Fm not described.) 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 pigment composition (2017-2018): Niwot_Ridge_Pigment.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 |