Publications
Detailed Information
Solar-induced chlorophyll fluorescence is non-linearly related to canopy photosynthesis in a temperate evergreen needleleaf forest during the fall transition
Cited 62 time in
Web of Science
Cited 70 time in Scopus
- Authors
- Issue Date
- 2021-06
- Publisher
- Elsevier BV
- Citation
- Remote Sensing of Environment, Vol.258, p. 112362
- Abstract
- Solar-induced chlorophyll fluorescence (SIF) provides us with new opportunities to understand the physiological and structural dynamics of vegetation from leaf to global scales. However, the relationships between SIF and gross primary productivity (GPP) are not fully understood, which is mainly due to the challenges of decoupling structural and physiological factors that control the relationships. Here, we report the results of continuous observations of canopy-level SIF, GPP, absorbed photosynthetically active radiation (APAR), and chlorophyll: carotenoid index (CCI) in a temperate evergreen needleleaf forest. To understand the mechanisms underlying the relationship between GPP and SIF, we investigated the relationships of light use efficiency (LUEp), chlorophyll fluorescence yield (?F), and the fraction of emitted SIF photons escaping from the canopy (fesc) separately. We found a strongly non-linear relationship between GPP and SIF at diurnal and seasonal time scales (R2 = 0.91 with a hyperbolic regression function, daily). GPP saturated with APAR, while SIF did not. Also, there were differential responses of LUEp and ?F to air temperature. While LUEp reached saturation at high air temperatures, ?F did not saturate. We found that the canopy-level chlorophyll: carotenoid index was strongly correlated to canopy-level ?F (R2 = 0.84) implying that ?F could be more closely related to pigment pool changes rather than LUEp. In addition, we found that the fesc contributed to a stronger SIF-GPP relationship by partially capturing the response of LUEp to diffuse light. These findings can help refine physiological and structural links between canopy-level SIF and GPP in evergreen needleleaf forest.
- ISSN
- 0034-4257
- Files in This Item:
- There are no files associated with this item.
Related Researcher
- College of Agriculture and Life Sciences
- Department of Landscape Architecture and Rural System Engineering
Item View & Download Count
Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.