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Jonas Ardö

Jonas Ardö

Professor

Jonas Ardö

Spatio-Temporal Convergence of Maximum Daily Light-Use Efficiency Based on Radiation Absorption by Canopy Chlorophyll

Author

  • Yao Zhang
  • Xiangming Xiao
  • Sebastian Wolf
  • Jin Wu
  • Xiaocui Wu
  • Beniamino Gioli
  • Georg Wohlfahrt
  • Alessandro Cescatti
  • Christiaan van der Tol
  • Sha Zhou
  • Christopher M. Gough
  • Pierre Gentine
  • Yongguang Zhang
  • Rainer Steinbrecher
  • Jonas Ardö
Show all

Summary, in English

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 (APARchl) and derive an estimation of the fraction of APARchl (fPARchl) 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 fPARchl, suggesting the corresponding εmaxchl to have less seasonal variation. This spatio-temporal convergence of LUE derived from fPARchl can be used to build simple but robust gross primary production models and to better constrain process-based models.

Department/s

  • Dept of Physical Geography and Ecosystem Science

Publishing year

2018-04-28

Language

English

Pages

3508-3519

Publication/Series

Geophysical Research Letters

Volume

45

Issue

8

Document type

Journal article

Publisher

American Geophysical Union (AGU)

Topic

  • Geophysics

Keywords

  • Fraction of absorbed photosynthetic active radiation
  • Gross primary productivity
  • Optical vegetation activity indicator
  • Photosynthetic capacity
  • Production efficiency models
  • Solar-induced chlorophyll fluorescence

Status

Published

ISBN/ISSN/Other

  • ISSN: 0094-8276