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The spectral characteristics of rice plants subject to water deficiency were analysed and compared with healthy rice plants. Under water deficiency conditions, the reflectance of visible bands of the rice plants increased significantly,while the reflectance of near-and middle-infrared bands decreased.For the early detection of water deficiency,the visible band of Landsat ETM+ is more sensitive than the infrared bands.Band-3 showed the highest reflectance differences between rice under water-deficient and healthy conditions. The use of the vegetation index can distinguish rice under water deficiency more clearly than when only using a single band.The Ratio Vegetation Index (RVI) is the best vegetation index for both early detection of water deficiency and distinguishes the two rice conditions. 和文概要:稲作地での水供給状態の違いによる水稲の分光特性を比較した。水供給不足の状況では,水稲からの可視バ ンドの反射率は著しく増大したが,近赤外及び中間赤外バンドは低下した。水供給が不充分な初期には,Landsat ETM+ の可視バンドの反射率は,赤外バンドよりも敏感であった。なかでもバンド3は,水不足と充分な状況では大きな反射率 の違いを示した。植生指標(NDVI)は,単バンドの反射率を用いるよりも水供給不足と十分な状態における生育状況を区 別することが出来る。稲作指標(RVI)は,初期の水稲作付け状況での水供給状況を検知するために導入し有効であること が明らかになった。

Spectral characteristic comparison of rice plants under healthy and water-deficient conditions using Landsat ETM+ data