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Jonas Ardö

Professor

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

Författare

  • 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
Visa allt

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.

Avdelning/ar

  • Institutionen för naturgeografi och ekosystemvetenskap

Publiceringsår

2018-04-28

Språk

Engelska

Sidor

3508-3519

Publikation/Tidskrift/Serie

Geophysical Research Letters

Volym

45

Issue

8

Dokumenttyp

Artikel i tidskrift

Förlag

American Geophysical Union (AGU)

Ämne

  • Geophysics

Nyckelord

  • 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/Övrigt

  • ISSN: 0094-8276