TY - JOUR
T1 - Varying Contributions of Drivers to the Relationship Between Canopy Photosynthesis and Far-Red Sun-Induced Fluorescence for Two Maize Sites at Different Temporal Scales
AU - Miao, Guofang
AU - Guan, Kaiyu
AU - Suyker, Andrew E.
AU - Yang, Xi
AU - Arkebauer, Timothy J.
AU - Walter-Shea, Elizabeth A.
AU - Kimm, Hyungsuk
AU - Hmimina, Gabriel Y.
AU - Gamon, John A.
AU - Franz, Trenton E.
AU - Frankenberg, Christian
AU - Berry, Joseph A.
AU - Wu, Genghong
N1 - Funding Information:
K. G., G. M., H. K., and G. W. acknowledge the support from NASA New Investigator Award and NASA Terrestrial Ecology Program and DOE CABBI funding. C. F. and K. G. also acknowledge support from NASA Carbon Cycle Science. SIF data of this study are available at https://doi.org/10.13012/B2IDB-5893373_V1. The two study sites are part of the AmeriFlux long-term cropland sites. GPP and PAR data are available on the AmeriFlux website. The US-Ne1, US-Ne2, and US-Ne3 AmeriFlux sites are supported by the Lawrence Berkeley National Lab AmeriFlux Data Management Program and by the Carbon Sequestration Program, University of Nebraska-Lincoln Agricultural Research Division. Funding for AmeriFlux core site data was provided by the U.S. Department of Energy's Office of Science. Partial support from the Nebraska Agricultural Experiment Station with funding from the Hatch Act (accession 1002649) through the USDA National Institute of Food and Agriculture is also acknowledged.
Publisher Copyright:
©2020. American Geophysical Union. All Rights Reserved.
PY - 2020/2/1
Y1 - 2020/2/1
N2 - Sun-induced fluorescence (SIF) has been found to be strongly correlated with gross primary production (GPP) in a quasi-linear pattern at the scales beyond leaves. However, the causes of the GPP:SIF relationship deviating from a linear pattern remain unclear. In the current study conducted at two maize sites in Nebraska in 2017 summer growing season, we investigated the relationship between GPP and SIF at 760 nm (F760) at two temporal scales and quantified the contributions of incoming photosynthetically active radiation (PARin), fraction of absorbed PAR (fPAR), light use efficiency (LUE), and F760 yield (F760,y, defined as F760/(PARin×fPAR)) to GPP and F760 variabilities to further understand the linearity and deviations in the GPP:F760 relationship. We found the following: (1) For individual growth stages when canopy structure and chlorophyll content were stable, GPP and F760 were strongly controlled by PARin, while LUE and F760,y had much lower contributions to the GPP:F760 relationship; during this period, LUE and F760,y had either a slightly negative or no clear relationship, which explained some deviations in the GPP:SIF relationship. (2) At the seasonal scale, the contribution of LUE to GPP variability as well as the contribution of F760,y to F760 variability increased and was comparable to the contribution of PARin; the LUE:F760,y relationship showed a strong linear relationship, which strengthened the linear GPP:F760 relationship. Both maize sites showed similar patterns. A framework was applied to estimate LUE at individual stages and as a result, significantly improved the GPP estimation, thus enhancing the SIF potential for inferring photosynthesis.
AB - Sun-induced fluorescence (SIF) has been found to be strongly correlated with gross primary production (GPP) in a quasi-linear pattern at the scales beyond leaves. However, the causes of the GPP:SIF relationship deviating from a linear pattern remain unclear. In the current study conducted at two maize sites in Nebraska in 2017 summer growing season, we investigated the relationship between GPP and SIF at 760 nm (F760) at two temporal scales and quantified the contributions of incoming photosynthetically active radiation (PARin), fraction of absorbed PAR (fPAR), light use efficiency (LUE), and F760 yield (F760,y, defined as F760/(PARin×fPAR)) to GPP and F760 variabilities to further understand the linearity and deviations in the GPP:F760 relationship. We found the following: (1) For individual growth stages when canopy structure and chlorophyll content were stable, GPP and F760 were strongly controlled by PARin, while LUE and F760,y had much lower contributions to the GPP:F760 relationship; during this period, LUE and F760,y had either a slightly negative or no clear relationship, which explained some deviations in the GPP:SIF relationship. (2) At the seasonal scale, the contribution of LUE to GPP variability as well as the contribution of F760,y to F760 variability increased and was comparable to the contribution of PARin; the LUE:F760,y relationship showed a strong linear relationship, which strengthened the linear GPP:F760 relationship. Both maize sites showed similar patterns. A framework was applied to estimate LUE at individual stages and as a result, significantly improved the GPP estimation, thus enhancing the SIF potential for inferring photosynthesis.
KW - SIF yield
KW - Sun-induced fluorescence (SIF)
KW - gross primary production (GPP)
KW - light use efficiency (LUE)
KW - maize
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U2 - 10.1029/2019JG005051
DO - 10.1029/2019JG005051
M3 - Article
AN - SCOPUS:85080108245
SN - 2169-8953
VL - 125
JO - Journal of Geophysical Research G: Biogeosciences
JF - Journal of Geophysical Research G: Biogeosciences
IS - 2
M1 - e2019JG005051
ER -