气候变化领域集成服务门户(CCPortal): Fluorescence Correction Vegetation Index (FCVI): A physically based reflectance index to separate physiological and non-physiological information in far-red sun-induced chlorophyll fluorescence

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DOI	10.1016/j.rse.2020.111676
	Fluorescence Correction Vegetation Index (FCVI): A physically based reflectance index to separate physiological and non-physiological information in far-red sun-induced chlorophyll fluorescence
	Yang P.; van der Tol C.; Campbell P.K.E.; Middleton E.M.
发表日期	2020
ISSN	00344257
卷号	240
英文摘要	Sun-induced chlorophyll fluorescence (SIF) has been used to track vegetation photosynthetic activity for improving estimation of gross primary productivity (GPP) and detecting plant stress. There are both physical and physiological controls of SIF measured at the surface and retrieved from remote sensing including satellite observations. In order to accurately use SIF for monitoring of plant physiology, the effects of physically-based radiation processes related to leaf and canopy structure, notably photosynthetically active radiation (PAR) absorption and SIF scattering and re-absorption, must be characterized. In this study, we investigate both PAR absorption and SIF scattering processes and find that although it is difficult to quantify their effects individually by using just reflectance, the combined effects of the two processes can be well approximated by a reflectance index. This index, referred to as FCVI (Fluorescence Correction Vegetation Index), is defined as the difference between near-infrared (NIR) and broad-band visible (VIS, 400–700 nm) reflectance acquired under identical sun-canopy-observer geometry of the SIF measurements. The development of the index was based on the physical connection between reflectance and far-red SIF, which was revealed by using the spectral invariant theory. The utility of FCVI to correct far-red SIF for PAR absorption and scattering effects, thus improving the link to photosynthesis, was tested with data from: (i) a field experiment for a growing season; and (ii) a numerical experiment which included a number of scenarios generated by a radiative transfer model. For both the observations and simulations, the FCVI provided a promising estimate of the impact of the physically-based radiation processes on far-red SIF of moderately dense canopies (i.e., FCVI ≥ 0.18). Normalizing the TOC far-red SIF by both the incident PAR (iPAR) and the FCVI provided a good estimate of the far-red fluorescence emission efficiency of the canopies examined. This approach enhances our ability to generalize retrievals for vegetation processes as they change through natural growth phases and seasons. Taken together, far-red SIF and FCVI may enable the assessment of the light partitioning of vegetation canopies, an essential step to facilitate the use of far-red SIF for tracking physiological processes. © 2020 Elsevier Inc.
英文关键词	Canopy structure; Chlorophyll fluorescence; Photosynthesis; Spectral invariants; Sun-observer geometry; Vegetation reflectance index
语种	英语
scopus关键词	Chlorophyll; Infrared devices; Photosynthesis; Physiology; Radiation effects; Radiative transfer; Reflection; Remote sensing; Vegetation; Absorption and scatterings; Canopy structure; Chlorophyll fluorescence; Gross primary productivity; Photosynthetically active radiation; Physiological informations; Reflectance index; Spectral invariants; Fluorescence; canopy architecture; canopy reflectance; chlorophyll; error correction; fluorescence; leaf; net primary production; photosynthetically active radiation; physiological response; spectral reflectance; vegetation index
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/179429
作者单位	Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, Enschede, 7500 AE, Netherlands; Joint Center for Earth Systems Technology (JCET), University of Maryland, Baltimore County, Baltimore, MD 21228, United States; Biospheric Sciences Laboratory, NASA Goddard Space and Flight Center, Greenbelt, MD 20771, United States
推荐引用方式 GB/T 7714	Yang P.,van der Tol C.,Campbell P.K.E.,et al. Fluorescence Correction Vegetation Index (FCVI): A physically based reflectance index to separate physiological and non-physiological information in far-red sun-induced chlorophyll fluorescence[J],2020,240.
APA	Yang P.,van der Tol C.,Campbell P.K.E.,&Middleton E.M..(2020).Fluorescence Correction Vegetation Index (FCVI): A physically based reflectance index to separate physiological and non-physiological information in far-red sun-induced chlorophyll fluorescence.Remote Sensing of Environment,240.
MLA	Yang P.,et al."Fluorescence Correction Vegetation Index (FCVI): A physically based reflectance index to separate physiological and non-physiological information in far-red sun-induced chlorophyll fluorescence".Remote Sensing of Environment 240(2020).