TY - JOUR
T1 - Attributing differences of solar-induced chlorophyll fluorescence (SIF)-gross primary production (GPP) relationships between two C4 crops
T2 - corn and miscanthus
AU - Wu, Genghong
AU - Guan, Kaiyu
AU - Jiang, Chongya
AU - Kimm, Hyungsuk
AU - Miao, Guofang
AU - Bernacchi, Carl J.
AU - Moore, Caitlin E.
AU - Ainsworth, Elizabeth A.
AU - Yang, Xi
AU - Berry, Joseph A.
AU - Frankenberg, Christian
AU - Chen, Min
PY - 2022/8/15
Y1 - 2022/8/15
N2 - 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. 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.
AB - 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. 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.
KW - C4 crops
KW - Gross primary productivity
KW - Leaf absorbed energy partition
KW - Photosynthesis
KW - Solar-induced chlorophyll fluorescence
UR - http://www.scopus.com/inward/record.url?scp=85132767440&partnerID=8YFLogxK
U2 - 10.1016/j.agrformet.2022.109046
DO - 10.1016/j.agrformet.2022.109046
M3 - Article
AN - SCOPUS:85132767440
SN - 0168-1923
VL - 323
JO - Agricultural and Forest Meteorology
JF - Agricultural and Forest Meteorology
M1 - 109046
ER -