Heatwave breaks down the linearity between sun‐induced fluorescence and gross primary production
Chlorophyll
extreme events; gross primary production (GPP); heatwave; nonphotochemical quenching; photosynthesis; sun-induced fluorescence
extreme events
photosynthesis
gross primary production (GPP)
sun-induced fluorescence
info:eu-repo/classification/ddc/580
Forestry
Heatwave
04 agricultural and veterinary sciences
15. Life on land
Fluorescence
nonphotochemical quenching
Ecology, evolutionary biology
13. Climate action
ITC-ISI-JOURNAL-ARTICLE
0401 agriculture, forestry, and fisheries
ddc:580
Seasons
Photosynthesis
extreme events; gross primary production (GPP); heatwave; nonphotochemical quenching; photosynthesis; sun-induced fluorescence;
Ecosystem
Environmental Monitoring
DOI:
10.1111/nph.17920
Publication Date:
2021-12-18T06:24:23Z
AUTHORS (18)
ABSTRACT
Summary
Sun‐induced fluorescence in the far‐red region (SIF) is increasingly used as a remote and proximal‐sensing tool capable of tracking vegetation gross primary production (GPP). However, the use of SIF to probe changes in GPP is challenged during extreme climatic events, such as heatwaves.
Here, we examined how the 2018 European heatwave (HW) affected the GPP–SIF relationship in evergreen broadleaved trees with a relatively invariant canopy structure. To do so, we combined canopy‐scale SIF measurements, GPP estimated from an eddy covariance tower, and active pulse amplitude modulation fluorescence.
The HW caused an inversion of the photosynthesis–fluorescence relationship at both the canopy and leaf scales. The highly nonlinear relationship was strongly shaped by nonphotochemical quenching (NPQ), that is, a dissipation mechanism to protect from the adverse effects of high light intensity. During the extreme heat stress, plants experienced a saturation of NPQ, causing a change in the allocation of energy dissipation pathways towards SIF.
Our results show the complex modulation of the NPQ–SIF–GPP relationship at an extreme level of heat stress, which is not completely represented in state‐of‐the‐art coupled radiative transfer and photosynthesis models.
SUPPLEMENTAL MATERIAL
Coming soon ....
REFERENCES (73)
CITATIONS (87)
EXTERNAL LINKS
PlumX Metrics
RECOMMENDATIONS
FAIR ASSESSMENT
Coming soon ....
JUPYTER LAB
Coming soon ....