Satellite-Detected Contrasting Responses of Canopy Structure and Leaf Physiology to Drought

Gu, H; Yin, G; Yang, Y; Verger, A; Descals, A; Filella, I; Zeng, Y; Hao, D; Xie, Q; Li, X; Xiao, J; Peñuelas, J

Satellite-Detected Contrasting Responses of Canopy Structure and Leaf Physiology to Drought

Gu, H Yin, G Yang, Y Verger, A Descals, A Filella, I Zeng, Y Hao, D Xie, Q

Li, X Xiao, J Peñuelas, J

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Publisher:: Institute of Electrical and Electronics Engineers (IEEE)
Publication Type:: Journal Article
Citation:: IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2023, 16, pp. 2427-2436
Issue Date:: 2023-01-01

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Field	Value	Language
dc.contributor.author	Gu, H
dc.contributor.author	Yin, G
dc.contributor.author	Yang, Y
dc.contributor.author	Verger, A
dc.contributor.author	Descals, A
dc.contributor.author	Filella, I
dc.contributor.author	Zeng, Y
dc.contributor.author	Hao, D
dc.contributor.author	Xie, Q https://orcid.org/0000-0002-1576-6610
dc.contributor.author	Li, X
dc.contributor.author	Xiao, J
dc.contributor.author	Peñuelas, J
dc.date.accessioned	2024-03-11T01:25:34Z
dc.date.available	2024-03-11T01:25:34Z
dc.date.issued	2023-01-01
dc.identifier.citation	IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2023, 16, pp. 2427-2436
dc.identifier.issn	1939-1404
dc.identifier.issn	2151-1535
dc.identifier.uri	http://hdl.handle.net/10453/176432
dc.description.abstract	Disentangling drought impacts on plant photosynthesis is crucial for projecting future terrestrial carbon dynamics. We examined the separate responses of canopy structure and leaf physiology to an extreme summer drought that occurred in 2011 over Southwest China, where the weather was humid and radiation was the main growth-limiting factor. Canopy structure and leaf physiology were, respectively, represented by near-infrared reflectance of vegetation (NIRv) derived from MODIS data and leaf scale fluorescence yield (Φf) derived from both continuous SIF (CSIF) and global OCO-2 SIF (GOSIF). We detected contrasting responses of canopy structure and leaf physiology to drought with a 14.0% increase in NIRv, compared with 12.6 or 19.3% decreases in Φf from CSIF and GOSIF, respectively. The increase in structure resulted in a slight carbon change, due to water deficit-induced physiological constraints. The net ecosystem effect was a 7.5% (CSIF), 1.2% (GOSIF), and-2.96% (EC-LUE GPP) change in photosynthesis. Our study improves understanding of complex vegetation responses of plant photosynthesis to drought and may contribute to the reconciliation of contrasting observed directions in plant responses to drought in cloudy regions via remote sensing.
dc.language	en
dc.publisher	Institute of Electrical and Electronics Engineers (IEEE)
dc.relation.ispartof	IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
dc.relation.isbasedon	10.1109/JSTARS.2023.3247422
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0406 Physical Geography and Environmental Geoscience, 0801 Artificial Intelligence and Image Processing, 0909 Geomatic Engineering
dc.subject.classification	3709 Physical geography and environmental geoscience
dc.subject.classification	4013 Geomatic engineering
dc.subject.classification	4601 Applied computing
dc.title	Satellite-Detected Contrasting Responses of Canopy Structure and Leaf Physiology to Drought
dc.type	Journal Article
utslib.citation.volume	16
utslib.for	0406 Physical Geography and Environmental Geoscience
utslib.for	0801 Artificial Intelligence and Image Processing
utslib.for	0909 Geomatic Engineering
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Science
pubs.organisational-group	University of Technology Sydney/Faculty of Science/School of Life Sciences
pubs.organisational-group	University of Technology Sydney/Strength - CAMGIS - Centre for Advanced Modelling and Geospatial lnformation Systems
utslib.copyright.status	open_access	*
dc.date.updated	2024-03-11T01:25:32Z
pubs.publication-status	Published
pubs.volume	16

Abstract:

Disentangling drought impacts on plant photosynthesis is crucial for projecting future terrestrial carbon dynamics. We examined the separate responses of canopy structure and leaf physiology to an extreme summer drought that occurred in 2011 over Southwest China, where the weather was humid and radiation was the main growth-limiting factor. Canopy structure and leaf physiology were, respectively, represented by near-infrared reflectance of vegetation (NIRv) derived from MODIS data and leaf scale fluorescence yield (Φf) derived from both continuous SIF (CSIF) and global OCO-2 SIF (GOSIF). We detected contrasting responses of canopy structure and leaf physiology to drought with a 14.0% increase in NIRv, compared with 12.6 or 19.3% decreases in Φf from CSIF and GOSIF, respectively. The increase in structure resulted in a slight carbon change, due to water deficit-induced physiological constraints. The net ecosystem effect was a 7.5% (CSIF), 1.2% (GOSIF), and-2.96% (EC-LUE GPP) change in photosynthesis. Our study improves understanding of complex vegetation responses of plant photosynthesis to drought and may contribute to the reconciliation of contrasting observed directions in plant responses to drought in cloudy regions via remote sensing.

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http://hdl.handle.net/10453/176432