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
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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