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
0207 environmental engineering
Forestry
Heatwave
04 agricultural and veterinary sciences
02 engineering and technology
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
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, use SIF to probe changes GPP challenged during extreme climatic events, such heatwaves. Here, we examined how 2018 European heatwave (HW) affected GPP-SIF relationship evergreen broadleaved trees with relatively invariant canopy structure. To do so, combined canopy-scale measurements, estimated from an eddy covariance tower, active pulse amplitude modulation fluorescence. The HW caused inversion photosynthesis-fluorescence at both leaf scales. highly nonlinear was strongly shaped by nonphotochemical quenching (NPQ), that is, dissipation mechanism protect adverse effects high light intensity. During heat stress, plants experienced saturation NPQ, causing change allocation energy pathways towards SIF. Our results show complex NPQ-SIF-GPP level which not completely represented state-of-the-art coupled radiative transfer photosynthesis models.
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