skip to main content

DOE PAGESDOE PAGES

This content will become publicly available on January 29, 2019

Title: Sun-Induced Chlorophyll Fluorescence, Photosynthesis, and Light Use Efficiency of a Soybean Field from Seasonally Continuous Measurements

Recent development of sun-induced chlorophyll fluorescence (SIF) technology is stimulating studies to remotely approximate canopy photosynthesis (measured as gross primary production, GPP). While multiple applications have advanced the empirical relationship between GPP and SIF, mechanistic understanding of this relationship is still limited. GPP:SIF relationship, using the standard light use efficiency framework, is determined by absorbed photosynthetically active radiation (APAR) and the relationship between photosynthetic light use efficiency (LUE) and fluorescence yield (SIF y). While previous studies have found that APAR is the dominant factor of the GPP:SIF relationship, the LUE:SIF y relationship remains unclear. For a better understanding of the LUE:SIF y relationship, in this paper we deployed a ground-based system (FluoSpec2), with an eddy-covariance flux tower at a soybean field in the Midwestern U.S. during the 2016 growing season to collect SIF and GPP data simultaneously. With the measurements categorized by plant growth stages, light conditions, and time scales, we confirmed that a strong positive GPP:SIF relationship was dominated by an even stronger linear SIF:APAR relationship. By normalizing both GPP and SIF by APAR, we found that under sunny conditions our soybean field exhibited a clear positive SIF y:APAR relationship and a weak negative LUE:SIF y relationship, opposite tomore » the positive LUE:SIF y relationship reported previously in other ecosystems. Our study provides a first continuous SIF record over multiple growth stages for agricultural systems and reveals a distinctive pattern related to the LUE:SIF y relationship compared with previous work. Finally, the observed positive relationship of SIF y:APAR at the soybean site provides new insights of the previous understanding on the SIF's physiological implications.« less
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [3] ;  [4] ;  [5] ; ORCiD logo [6] ;  [7] ;  [8] ;  [8] ;  [9] ; ORCiD logo [10] ;  [1] ;  [6]
  1. Univ. of Illinois, Urbana, IL (United States). Dept. of Natural Resources and Environmental Sciences
  2. Univ. of Illinois, Urbana, IL (United States). Dept. of Natural Resources and Environmental Sciences. National Center of Supercomputing Applications
  3. Univ. of Virginia, Charlottesville, VA (United States). Dept. of Environmental Sciences
  4. Univ. of Illinois, Urbana, IL (United States). Dept. of Plant Biology. Carl R. Woese Inst. for Genomic Biology; USDA ARS Global Change and Photosynthesis Research Unit, Urbana, IL (United States)
  5. Carnegie Inst. for Science, Stanford, CA (United States). Dept. of Global Ecology
  6. Univ. of Illinois, Urbana, IL (United States). Dept. of Plant Biology. Carl R. Woese Inst. for Genomic Biology. Inst. for Sustainability, Energy, and Environment
  7. Brookhaven National Lab. (BNL), Upton, NY (United States). Environmental and Climate Sciences Dept.
  8. Univ. of Illinois, Urbana, IL (United States). Dept. of Plant Biology. Carl R. Woese Inst. for Genomic Biology
  9. Univ. of Illinois, Urbana, IL (United States). Dept. of Geography and Geographic Information Science
  10. Univ. of Illinois, Urbana, IL (United States). National Center of Supercomputing Applications
Publication Date:
Report Number(s):
BNL-203265-2018-JAAM
Journal ID: ISSN 2169-8953
Grant/Contract Number:
SC0012704; NNX16AI56G; 80NSSC17K0110
Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Biogeosciences
Additional Journal Information:
Journal Volume: 123; Journal Issue: 2; Journal ID: ISSN 2169-8953
Publisher:
American Geophysical Union
Research Org:
Univ. of Illinois at Urbana-Champaign, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Science (SC); National Aeronautic and Space Administration (NASA)
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; 58 GEOSCIENCES
OSTI Identifier:
1425085