反射スペクトルによる芝の塩・水ストレス診断

概要

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In this paper, we tried to diagnose the stress that was brought by water shortage and salinization by spectral reflectance. The concentration of chlorophyll and leaf water content with raw leaf of grass was changed by these stresses. Spectral reflectance was influenced by the stresses too. But the pattern of spectral curve changes was not the same for water shortage and salinization. The concentration of chlorophyll was decreased similarly by both stresses. On the other hands, the leaf water content was extremely decreased by water shortage compared to salinization. We couldn't learn the cause of stress using the concentration of chlorophyll as the only index of stress. It is necessary for diagnosis of stress that both concentration of chlorophyll and leaf water content be applied as the indexes of stress. The concentration of chlorophyll and leaf water content could be measured by spectral reflectance not concerned with the kind of stress. The concentration of chlorophyll was estimated by R800 nm/R680 nm. The leaf water content was estimated by R1200 nm/R1500 nm. Application of these indexes makes possible the diagnosis of water shortage and salinization stress by remote sensing.
日本農業気象学会の論文