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Seasonal and vertical variation in canopy structure and leaf spectral properties determine the canopy reflectance of a rice field

文献类型：期刊论文

作者Liu, Weiwei1,5; Mottus, Matti4; Gastellu-Etchegorry, Jean-Philippe3; Fang, Hongliang2; Atherton, Jon1
刊名AGRICULTURAL AND FOREST METEOROLOGY
出版日期2024-08-15
卷号355页码:14
关键词Radiative transfer simulation Canopy structure Leaf inclination angle Clumping Seasonal and vertical variation
ISSN号0168-1923
DOI10.1016/j.agrformet.2024.110132
英文摘要Physical model simulations have been widely utilized to simulate the reflectance of vegetation canopies. Such simulations can be used to estimate key biochemical and physical vegetation parameters, such as leaf chlorophyll content (LCC), leaf area index (LAI), and leaf inclination angle (LIA) from remotely sensed data via model inversion. In simulations, field crops are typically regarded as one-dimensional (1D) vegetation canopies with constant leaf properties in the vertical direction and across the growing season. We investigated the seasonal effects of these two simplifications, 1D canopy structure, and vertically constant leaf properties, on canopy reflectance simulations in a rice field using in situ measurements and the 3D discrete anisotropic radiative transfer model (DART). We also developed a new methodology for reconstructing 3D crop canopy architecture, which was validated using measurements of gap fraction and canopy reflectance. Our results revealed that the 1D canopy assumption only holds during the early stage of the growing season, then leaf clumping affects canopy reflectance from the jointing stage onwards. Consideration of the 3D canopy structure and its seasonal variation significantly reduced the deviation between simulated and measured canopy reflectance in the green and nearinfrared wavelengths when compared to the typical 1D canopy assumption and produced the closest multiangular distribution pattern to the measurements. The vertical heterogeneity of leaf spectra affected canopy reflectance weakly during the maturation stage when senescence started from the bottom of the canopy. Consideration of seasonal and vertical variation in LIAs significantly improved the results of 1D canopy reflectance simulations, including the multi-angular distribution patterns. In contrast, the directionally-averaged clumping index (CI) only slightly improved the 1D canopy reflectance simulation. To summarize, these findings can be used to reduce the simulation bias of canopy reflectance and improve the retrieval accuracy of key vegetation parameters in crop canopies at the seasonal scale.
WOS关键词INDUCED CHLOROPHYLL FLUORESCENCE ; AREA INDEX LAI ; RADIATIVE-TRANSFER ; VEGETATION INDEX ; LIGHT-SCATTERING ; MODEL ; INVERSION ; TRAITS ; PHOTOSYNTHESIS ; EMISSION
资助项目Chinese Natural Science Foundation[42101325] ; Natural Science Foundation of Fujian Province, China[2021J01210949] ; Academy of Finland[347929]
WOS研究方向Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
语种英语
WOS记录号WOS:001280890800001
出版者ELSEVIER
资助机构Chinese Natural Science Foundation ; Natural Science Foundation of Fujian Province, China ; Academy of Finland
源URL[http://ir.igsnrr.ac.cn/handle/311030/207070]  
专题资源与环境信息系统国家重点实验室_外文论文
通讯作者Liu, Weiwei
作者单位1.Univ Helsinki, Inst Atmospher & Earth Syst Res INAR Forest Sci, Opt Photosynth Lab, POB 27, Helsinki 00014, Finland
2.Chinese Acad Sci, LREIS, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
3.Toulouse Univ, Toulouse III Univ, Ctr Study Biosphere Space CESBIO, CNRS,CNES,IRD, 18 Ave Edouard Belin, F-31401 Toulouse, France
4.VTT Tech Res Ctr Finland, POB 1000, Espoo 02044, Vtt, Finland
5.Fujian Agr & Forestry Univ, Coll Resources & Environm, Fuzhou 350002, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Weiwei,Mottus, Matti,Gastellu-Etchegorry, Jean-Philippe,et al. Seasonal and vertical variation in canopy structure and leaf spectral properties determine the canopy reflectance of a rice field[J]. AGRICULTURAL AND FOREST METEOROLOGY,2024,355:14.
APA Liu, Weiwei,Mottus, Matti,Gastellu-Etchegorry, Jean-Philippe,Fang, Hongliang,&Atherton, Jon.(2024).Seasonal and vertical variation in canopy structure and leaf spectral properties determine the canopy reflectance of a rice field.AGRICULTURAL AND FOREST METEOROLOGY,355,14.
MLA Liu, Weiwei,et al."Seasonal and vertical variation in canopy structure and leaf spectral properties determine the canopy reflectance of a rice field".AGRICULTURAL AND FOREST METEOROLOGY 355(2024):14.

入库方式： OAI收割

来源：地理科学与资源研究所

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