Influence of leaf water status on leaf area index and leaf nitrogen concentration inversion of wheat canopy

Chunjiang Zhao; Jihua Wang; Wenjiang Huang; Liangyun Liu

doi:10.1117/12.578698

20 January 2005 Influence of leaf water status on leaf area index and leaf nitrogen concentration inversion of wheat canopy

Chunjiang Zhao, Jihua Wang, Wenjiang Huang, Liangyun Liu

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Proceedings Volume 5655, Multispectral and Hyperspectral Remote Sensing Instruments and Applications II; (2005) https://doi.org/10.1117/12.578698
Event: Fourth International Asia-Pacific Environmental Remote Sensing Symposium 2004: Remote Sensing of the Atmosphere, Ocean, Environment, and Space, 2004, Honolulu, Hawai'i, United States

Abstract

A field trial was conduct to investigate the relationship between spectral feature of winter wheat canopy and LAI as well as leaf nitrogen (N) under different status of leaf water in field situation. The objective of this study is to investigate effect of water status in plants on the accuracy of estimating leaf area index (LAI) and plant nitrogen. The new defined spectral index, IAFC = (R₂₂₂₄-R₂₀₅₄)/ (R₂₂₂₄+R₂₀₅₄), where R is the reflectance at 2224nm or 2054nm, was significantly (α=0.05) or extremely significantly (α=0.01) correlated with LAI at all the six dates for water insufficient plants, but not significantly correlated for water sufficient plants at five of the six dates and the difference of leaf water content between the water insufficient plants and water sufficient plants was only about 2% at some dates. The study provided strong evidence that leaf water has a strong masking effect on the 2000-2300nm spectral feature, which could be strongly associated with LAI and leaf N even when the leaf water content was as high as about 80% if the water was insufficient for plant growth. The results indicated that the masking effect of leaf water on the 2000-2300nm spectral feature was not only dependent on the absolute plant water content but also on the water status and that remotely sensed data in the 2000-2300nm region could be of potential in monitoring plant canopy biophysics and biochemistry in drought condition.

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Chunjiang Zhao, Jihua Wang, Wenjiang Huang, and Liangyun Liu "Influence of leaf water status on leaf area index and leaf nitrogen concentration inversion of wheat canopy", Proc. SPIE 5655, Multispectral and Hyperspectral Remote Sensing Instruments and Applications II, (20 January 2005); https://doi.org/10.1117/12.578698

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KEYWORDS

Reflectivity

Nitrogen

Biophysics

Chemistry

Biochemistry

Near infrared

Proteins

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