气候变化领域集成服务门户(CCPortal): Canopy structure explains the relationship between photosynthesis and sun-induced chlorophyll fluorescence in crops

CCPortal

DOI	10.1016/j.rse.2020.111733
	Canopy structure explains the relationship between photosynthesis and sun-induced chlorophyll fluorescence in crops
	Dechant B.; Ryu Y.; Badgley G.; Zeng Y.; Berry J.A.; Zhang Y.; Goulas Y.; Li Z.; Zhang Q.; Kang M.; Li J.; Moya I.
发表日期	2020
ISSN	00344257
卷号	241
英文摘要	Remote sensing of far-red sun-induced chlorophyll fluorescence (SIF) has emerged as an important tool for studying gross primary productivity (GPP) at the global scale. However, the relationship between SIF and GPP at the canopy scale lacks a clear mechanistic explanation. This is largely due to the poorly characterized role of the relative contributions from canopy structure and leaf physiology to the variability of the top-of-canopy, observed SIF signal. In particular, the effect of the canopy structure beyond light absorption is that only a fraction (fesc) of the SIF emitted from all leaves in the canopy can escape from the canopy due to the strong scattering of near-infrared radiation. We combined rice, wheat and corn canopy-level in-situ datasets to study how the physiological and structural components of SIF individually relate to measures of photosynthesis. At seasonal time scales, we found a considerably strong positive correlation (R2 = 0.4–0.6) of fesc to the seasonal dynamics of the photosynthetic light use efficiency (LUEP), while the estimated physiological SIF yield was almost entirely uncorrelated to LUEP both at seasonal and diurnal time scales, with the partial exception of wheat. Consistent with these findings, the canopy structure and radiation component of SIF, defined as the product of APAR and fesc, explained the relationship of observed SIF to GPP and even outperformed GPP estimation based on observed SIF at two of the three sites investigated. These results held for both half-hourly and daily mean values. In contrast, the total emitted SIF, obtained by normalizing observed SIF for fesc, improved only the relationship to APAR but considerably decreased the correlation to GPP for all three crops. Our findings demonstrate the dominant role of canopy structure in the SIF-GPP relationship and establish a strong, mechanistic link between the near-infrared reflectance of vegetation (NIRV) and the relevant canopy structure information contained in the SIF signal. These insights are expected to be useful in improving remote sensing based GPP estimates. © 2020 Elsevier Inc.
英文关键词	Canopy scattering; Canopy structure; Escape fraction; Light use efficiency; Near-infrared reflectance of vegetation; NIRv; Photosynthesis; Sun-induced chlorophyll fluorescence
语种	英语
scopus关键词	Chlorophyll; Crops; Efficiency; Fluorescence; Infrared radiation; Light absorption; Photosynthesis; Physiology; Reflection; Remote sensing; Vegetation; Canopy scattering; Canopy structure; Chlorophyll fluorescence; Escape fraction; Light use efficiency; Near infra-red reflectances; NIRv; Infrared devices; chlorophyll; crop plant; crop yield; fluorescence; light use efficiency; photosynthesis; remote sensing; solar radiation; Triticum aestivum; Zea mays
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179375
作者单位	Department of Landscape Architecture and Rural Systems Engineering, Seoul National University, South Korea; Department of Global Ecology, Carnegie Institution for Science, Stanford, United States; International Institute for Earth System Sciences, Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing, China; Dynamic Meteorology Laboratory, Ecole Polytechnique, Palaiseau, France; National Center for AgroMeteorology, Seoul, South Korea
推荐引用方式 GB/T 7714	Dechant B.,Ryu Y.,Badgley G.,et al. Canopy structure explains the relationship between photosynthesis and sun-induced chlorophyll fluorescence in crops[J],2020,241.
APA	Dechant B..,Ryu Y..,Badgley G..,Zeng Y..,Berry J.A..,...&Moya I..(2020).Canopy structure explains the relationship between photosynthesis and sun-induced chlorophyll fluorescence in crops.Remote Sensing of Environment,241.
MLA	Dechant B.,et al."Canopy structure explains the relationship between photosynthesis and sun-induced chlorophyll fluorescence in crops".Remote Sensing of Environment 241(2020).