Linking photosynthesis and sun-induced fluorescence at sub-daily to seasonal scales

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Title:Main Title: Linking photosynthesis and sun-induced fluorescence at sub-daily to seasonal scales
Description:Abstract: Due to its close link to the photosynthetic process, sun-induced chlorophyll fluorescence (F) opens new possibilities to study dynamics of photosynthetic light reactions and to quantify CO2 assimilation rates. Although recent studies show that F is linearly related to gross primary production (GPP) on coarse spatial and temporal scales, it is argued that this relationship may be mainly driven by seasonal changes in absorbed photochemical active radiation (APAR) and less by the plant light use efficiency (LUE). In this work a high-resolution spectrometer was used to continuously measure red and far-red fluorescence and different reflectance indices within a sugar beet field during the growing season in 2015. Diurnal and seasonal developments were compared to eddy covariance derived GPP. Additionally, part of the time series coincided with a heatwave. The induced drought stress allowed us to observe F and its relationship to GPP under changing environmental conditions during the seasonal cycle. Across the season a strong linear relationship between GPP and F760 was found. This relationship however, was mainly driven by changes in APAR and was strongly reduced under drought conditions. We could show that far-red fluorescence yield can explain 59% of the diurnal and 79% of the seasonal variance in the light use efficiency. However, an even stronger relationship between FY760 and the structural vegetation index MTVI2 was found, implying that FY760 is affected by seasonal structural changes of the canopy. Nevertheless, the seasonally de-trended FY760 and PRI show that they share strong interdependencies with seasonal and diurnal LUE, in particular under drought stress conditions.
Identifier:10.1016/j.rse.2018.10.019 (DOI)
Responsible Party
Creators:Sebastian Wieneke (Author), Andreas Burkart (Author), Maria Pilar Cendrero-Mateo (Author), Tommaso Julitta (Author), Micol Rossini (Author), Anke Schickling (Author), Marius Schmidt (Author), Uwe Rascher (Author)
Publisher:Elsevier
Publication Year:2018
Topic
TR32 Topic:Vegetation
Related Subproject:D2
Subjects:Keywords: Chlorophyll Fluorescence, LUE, Fluorescence
File Details
Filename:Wieneke_et_al_2018.pdf
Data Type:Text - Article
Size:12 Pages
File Size:3.2 MB
Dates:Submitted: 14.09.2017
Accepted: 14.10.2018
Available: 19.10.2018
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Only Project Members
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Licence:[TR32DB] Data policy agreement
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Publication Status:Accepted
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Remote Sensing of Environment
Volume:219
Number of Pages:12 (247 - 258)
Metadata Details
Metadata Creator:Tanja Kramm
Metadata Created:22.10.2018
Metadata Last Updated:22.10.2018
Subproject:D2
Funding Phase:3
Metadata Language:English
Metadata Version:V50
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