Accounting for changes in radiation improves the ability of SIF to track water stress-induced losses in summer GPP in a temperate deciduous forest
Global observations of solar-induced chlorophyll fluorescence (SIF) are available from multiple satellite platforms, and SIF is increasingly used as a proxy for photosynthetic activity and ecosystem productivity. Because the relationship between SIF and gross primary productivity (GPP) depends on a...
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| Main Authors: | , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
July 2023
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| In: |
Journal of geophysical research. Biogeosciences
Year: 2023, Volume: 128, Issue: 7, Pages: 1-14 |
| ISSN: | 2169-8961 |
| DOI: | 10.1029/2022JG007352 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1029/2022JG007352 Verlag, kostenfrei, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1029/2022JG007352 
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| Author Notes: | Zachary Butterfield, Troy Magney, Katja Grossmann, Gil Bohrer, Chris Vogel, Stephen Barr, and Gretchen Keppel-Aleks |
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| 520 | |a Global observations of solar-induced chlorophyll fluorescence (SIF) are available from multiple satellite platforms, and SIF is increasingly used as a proxy for photosynthetic activity and ecosystem productivity. Because the relationship between SIF and gross primary productivity (GPP) depends on a variety of factors including ecosystem type and environmental conditions, it is necessary to study SIF observations across various spatiotemporal scales and ecosystems. To explore how SIF signals relate to productivity over a temperate deciduous forest, we deployed a PhotoSpec spectrometer system at the University of Michigan Biological Station AmeriFlux site (US-UMB) in the northern Lower Peninsula of Michigan during the 2018 and 2019 growing seasons. We found that SIF correlated with GPP across diurnal and seasonal cycles (R2 = 0.61 and 0.64 for 90-min- and daily-averaged data), but that SIF signals were more strongly related to downwelling radiation than GPP (R2 = 0.91 for daily-averaged data). The dependence of SIF on radiation obscured the impact of intraseasonal drought in the SIF timeseries, but drought stress was apparent as a decrease in relative SIF, which exhibited a stronger correlation with GPP (R2 = 0.56) than other remotely sensed data over the drought period. These results highlight the potential of SIF for detecting stress-induced losses in forest productivity. Additionally, we found that the red:far-red SIF ratio did not exhibit a response to water stress-induced losses in productivity, but was largely driven by seasonal and interannual changes in canopy structure, as well as by synoptic changes in downwelling radiation. | ||
| 650 | 4 | |a flux observations | |
| 650 | 4 | |a gross primary production | |
| 650 | 4 | |a remote sensing | |
| 650 | 4 | |a solar-induced chlorophyll fluorescence | |
| 650 | 4 | |a temperate deciduous forest | |
| 650 | 4 | |a water stress | |
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| 700 | 1 | |a Großmann, Katja |e VerfasserIn |0 (DE-588)1064718388 |0 (DE-627)815502613 |0 (DE-576)424081547 |4 aut | |
| 700 | 1 | |a Bohrer, Gil |e VerfasserIn |4 aut | |
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| 700 | 1 | |a Keppel-Aleks, Gretchen |e VerfasserIn |4 aut | |
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