Water Shortage and Salinization Diagnosis of the Grass by Spectral Reflectance

Kengo Ito, Tomoyasu Ezuka, Kyoichi Otsuki, Makio Kamichika

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1 Citation (Scopus)

Abstract

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 R800nm/R680nm. The leaf water content was estimated by R1200 nm/R1500nm. Application of these indexes makes possible the diagnosis of water shortage and salinization stress by remote sensing.

Original languageEnglish
Pages (from-to)199-204
Number of pages6
JournalJournal of Agricultural Meteorology
Volume59
Issue number2
DOIs
Publication statusPublished - Jan 1 2003

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Atmospheric Science

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