TY - JOUR
T1 - Spatio-Temporal Convergence of Maximum Daily Light-Use Efficiency Based on Radiation Absorption by Canopy Chlorophyll
AU - Zhang, Yao
AU - Xiao, Xiangming
AU - Wolf, Sebastian
AU - Wu, Jin
AU - Wu, Xiaocui
AU - Gioli, Beniamino
AU - Wohlfahrt, Georg
AU - Cescatti, Alessandro
AU - van der Tol, C.
AU - Zhou, Sha
AU - Gough, Christopher M.
AU - Gentine, Pierre
AU - Zhang, Yongguang
AU - Steinbrecher, Rainer
AU - Ardö, Jonas
PY - 2018/4/28
Y1 - 2018/4/28
N2 - Light-use efficiency (LUE), which quantifies the plants' efficiency in utilizing solar radiation for photosynthetic carbon fixation, is an important factor for gross primary production estimation. Here we use satellite-based solar-induced chlorophyll fluorescence as a proxy for photosynthetically active radiation absorbed by chlorophyll (APAR chl ) and derive an estimation of the fraction of APAR chl (fPAR chl ) from four remotely sensed vegetation indicators. By comparing maximum LUE estimated at different scales from 127 eddy flux sites, we found that the maximum daily LUE based on PAR absorption by canopy chlorophyll ( εmaxchl), unlike other expressions of LUE, tends to converge across biome types. The photosynthetic seasonality in tropical forests can also be tracked by the change of fPAR chl , suggesting the corresponding εmaxchl to have less seasonal variation. This spatio-temporal convergence of LUE derived from fPAR chl can be used to build simple but robust gross primary production models and to better constrain process-based models.
AB - Light-use efficiency (LUE), which quantifies the plants' efficiency in utilizing solar radiation for photosynthetic carbon fixation, is an important factor for gross primary production estimation. Here we use satellite-based solar-induced chlorophyll fluorescence as a proxy for photosynthetically active radiation absorbed by chlorophyll (APAR chl ) and derive an estimation of the fraction of APAR chl (fPAR chl ) from four remotely sensed vegetation indicators. By comparing maximum LUE estimated at different scales from 127 eddy flux sites, we found that the maximum daily LUE based on PAR absorption by canopy chlorophyll ( εmaxchl), unlike other expressions of LUE, tends to converge across biome types. The photosynthetic seasonality in tropical forests can also be tracked by the change of fPAR chl , suggesting the corresponding εmaxchl to have less seasonal variation. This spatio-temporal convergence of LUE derived from fPAR chl can be used to build simple but robust gross primary production models and to better constrain process-based models.
KW - fraction of absorbed photosynthetic active radiation
KW - gross primary productivity
KW - optical vegetation activity indicator
KW - photosynthetic capacity
KW - production efficiency models
KW - solar-induced chlorophyll fluorescence
KW - ITC-ISI-JOURNAL-ARTICLE
KW - UT-Hybrid-D
KW - 22/4 OA procedure
UR - https://ezproxy2.utwente.nl/login?url=https://doi.org/https://doi.org/10.1029/2017GL076354
UR - https://ezproxy2.utwente.nl/login?url=https://webapps.itc.utwente.nl/library/2018/isi/vandertol_spa.pdf
U2 - 10.1029/2017GL076354
DO - 10.1029/2017GL076354
M3 - Article
SN - 0094-8276
VL - 45
SP - 3508
EP - 3519
JO - Geophysical research letters
JF - Geophysical research letters
IS - 8
ER -