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Title: Attributing differences of solar-induced chlorophyll fluorescence (SIF)-gross primary production (GPP) relationships between two C4 crops: corn and miscanthus

Journal Article · · Agricultural and Forest Meteorology
ORCiD logo [1];  [1];  [1];  [2];  [3];  [4];  [5];  [6]; ORCiD logo [7]; ORCiD logo [8];  [9];  [10]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States); Univ. of Illinois, Urbana, IL (United States); DOE Center for Advanced Bioenergy and Bioproducts Innovation, Urbana, IL (United States)
  2. Univ. of Illinois at Urbana-Champaign, IL (United States); Univ. of Illinois, Urbana, IL (United States); Seoul National Univ. (Korea, Republic of)
  3. Univ. of Illinois, Urbana, IL (United States)
  4. Univ. of Illinois at Urbana-Champaign, IL (United States); DOE Center for Advanced Bioenergy and Bioproducts Innovation, Urbana, IL (United States); Univ. of Illinois, Urbana, IL (United States); USDA-ARS, Urbana, IL (United States)
  5. Univ. of Illinois at Urbana-Champaign, IL (United States); DOE Center for Advanced Bioenergy and Bioproducts Innovation, Urbana, IL (United States); Univ. of Western Australia, Crawley, WA (Australia)
  6. Univ. of Illinois at Urbana-Champaign, IL (United States); DOE Center for Advanced Bioenergy and Bioproducts Innovation, Urbana, IL (United States); USDA-ARS, Urbana, IL (United States)
  7. Univ. of Virginia, Charlottesville, VA (United States)
  8. Carnegie Inst. for Science, Stanford, CA (United States)
  9. California Institute of Technology (CalTech), Pasadena, CA (United States)
  10. Univ. of Wisconsin, Madison, WI (United States)

There remains limited information to characterize the solar-induced chlorophyll fluorescence (SIF)-gross primary production (GPP) relationship in C4 cropping systems. The annual C4 crop corn and perennial C4 crop miscanthus differ in phenology, canopy structure and leaf physiology. Investigating the SIF-GPP relationships in these species could deepen our understanding of SIF-GPP relationships within C4 crops. Using in situ canopy SIF and GPP measurements for both species along with leaf-level measurements, we found considerable differences in the SIF-GPP relationships between corn and miscanthus, with a stronger SIF-GPP relationship and higher slope of SIF-GPP observed in corn compared to miscanthus. These differences were mainly caused by leaf physiology. For miscanthus, high non-photochemical quenching (NPQ) under high light, temperature and water vapor deficit (VPD) conditions caused a large decline of fluorescence yield (ΦF), which further led to a SIF midday depression and weakened the SIF-GPP relationship. The larger slope in corn than miscanthus was mainly due to its higher GPP in mid-summer, largely attributed to the higher leaf photosynthesis and less NPQ. Furthermore, our results demonstrated variation of the SIF-GPP relationship within C4 crops and highlighted the importance of leaf physiology in determining canopy SIF behaviors and SIF-GPP relationships.

Research Organization:
Center for Advanced Bioenergy and Bioproducts Innovation (CABBI), Urbana, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0018420
OSTI ID:
1875077
Journal Information:
Agricultural and Forest Meteorology, Vol. 323; ISSN 0168-1923
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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