Attributing differences of solar-induced chlorophyll fluorescence (SIF)-gross primary production (GPP) relationships between two C4 crops: corn and miscanthus
Abstract
There remains limited information to characterize the solar-induced chlorophyll fluorescence (SIF)-gross primary production (GPP) relationship in C4 cropping systems. The annual C4 crop corn and perennial C4 crop miscanthus differ in phenology, canopy structure and leaf physiology. Investigating the SIF-GPP relationships in these species could deepen our understanding of SIF-GPP relationships within C4 crops. Using in situ canopy SIF and GPP measurements for both species along with leaf-level measurements, we found considerable differences in the SIF-GPP relationships between corn and miscanthus, with a stronger SIF-GPP relationship and higher slope of SIF-GPP observed in corn compared to miscanthus. These differences were mainly caused by leaf physiology. For miscanthus, high non-photochemical quenching (NPQ) under high light, temperature and water vapor deficit (VPD) conditions caused a large decline of fluorescence yield (Φ_F), which further led to a SIF midday depression and weakened the SIF-GPP relationship. The larger slope in corn than miscanthus was mainly due to its higher GPP in mid-summer, largely attributed to the higher leaf photosynthesis and less NPQ. Our results demonstrated variation of the SIF-GPP relationship within C4 crops and highlighted the importance of leaf physiology in determining canopy SIF behaviors and SIF-GPP relationships.
Additional Information
© 2022 Elsevier. Received 2 January 2022, Revised 19 May 2022, Accepted 6 June 2022, Available online 21 June 2022, Version of Record 21 June 2022. This work was funded by the DOE Center for Advanced Bioenergy and Bioproducts Innovation (U.S. Department of Energy, Office of Science, Office of Biological and Environmental Research under Award Number DE-SC0018420). Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the U.S. Department of Energy. GW and KG also acknowledged the support from NASA Future Investigators in NASA Earth and Space Science and Technology (FINESST) Program. GW, KG, and HK, acknowledged the support from NASA Carbon Monitoring System program managed by the NASA Terrestrial Ecology Program. We thank M. Pilar Cendrero-Mateo for sharing the iFLD code for SIF retrieval. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.Attached Files
Published - 1-s2.0-S0168192322002350-main.pdf
Supplemental Material - 1-s2.0-S0168192322002350-gr12_lrg.jpg
Supplemental Material - 1-s2.0-S0168192322002350-gr13_lrg.jpg
Supplemental Material - 1-s2.0-S0168192322002350-gr14_lrg.jpg
Supplemental Material - 1-s2.0-S0168192322002350-mmc1.docx
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Additional details
- Eprint ID
- 115329
- Resolver ID
- CaltechAUTHORS:20220705-346555000
- Department of Energy (DOE)
- DE-SC0018420
- NASA Earth and Space Science Fellowship
- Created
-
2022-07-08Created from EPrint's datestamp field
- Updated
-
2022-07-25Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences (GPS)