Derivation of canopy light absorption coefficient from reflectance spectra

REMOTE SENSING OF ENVIRONMENT

卷:231

Article

Gitelson, Anatoly^1,2  Vina, Andres^3,4  Solovchenko, Alexei^5,6,7  Arkebauer, Timothy⁸  Inoue, Yoshio^9,10 

[1] Univ Nebraska, Sch Nat Resources, Lincoln, NE 68583 USA

[2] Israel Inst Technol Technion, IL-3200003 Haifa, Israel

[3] Michigan State Univ, Dept Fisheries & Wildlife, Ctr Syst Integrat & Sustainabil, Lansing, MI 48823 USA

[4] Univ N Carolina, Dept Geog, Chapel Hill, NC 27599 USA

[5] Lomonosov Moscow State Univ, Fac Biol, Dept Bioengn, Moscow, Russia

[6] Michurin Fed Sci Ctr, Michurinsk, Russia

[7] RUDN Univ, Peoples Friendship Univ Russia, Moscow, Russia

[8] Univ Nebraska, Dept Agron & Hort, Lincoln, NE 68583 USA

[9] Univ Tokyo, Res Ctr Adv Sci & Technol, Tokyo 1538904, Japan

[10] NARO NIAES, Inst Agroenvironm Sci, Tsukuba, Ibaraki 3058604, Japan

关键词: Absorption and scattering coefficients;    Plant canopy;    Pigment content;   

DOI  :  10.1016/j.rse.2019.111276

来源: Elsevier

【 摘 要 】

The light absorption coefficient of vegetation is related to the content and composition of pigments in the plant canopy. It is a useful metric for understanding the spatial and temporal dynamics of the absorbed solar radiation, photosynthetic capacity, and productivity of vegetation. Still, its estimation in vivo is challenging due to the large variability induced by numerous features: canopy-related factors, including biochemical and structural characteristics, and factors external to the canopy such as soil background, solar irradiation, and sun-target sensor geometry conditions. Here we revisit a semi-analytical modeling framework for deriving the light absorption coefficient of plant canopies from reflectance data. The proposed approach is based on the partition of the total light absorption coefficient into photosynthetic and non-photosynthetic pigment components in the canopy, and canopy backscattering. The model-derived absorption coefficient of chlorophyll was compared with field matchups of total canopy chlorophyll content in three crops with contrasting leaf structures, canopy architectures and photosynthetic pathways: maize, soybean, and rice. The model allows for the derivation of absorption coefficient spectra across the photosynthetically active radiation and the red edge spectral regions, as well as accurate estimations of canopy chlorophyll content, both of which are necessary for analyzing the physiological and phenological status, and the canopy-level photosynthetic capacity, of plants.

【 授权许可】

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