Relationships between Photosynthesis and Spectral Reflectance Indices in Japanese Larch Needles.

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  • Nakaji T
    Center for Global Environmental Research
  • Takeda T
    Center for Global Environmental Research
  • Mukai Y
    Faculty of Agriculture, University of Shizuoka
  • Koike T
    Field Science Center for Northern Biosphere, Hokkaido University
  • Oguma H
    Center for Global Environmental Research
  • Fujinuma Y
    Center for Global Environmental Research

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Other Title
  • カラマツ針葉の光合成活性と分光反射指標の関傍
  • カラマツ針葉の光合成活性と分光反射指標の関係
  • カラマツシン ヨウ ノ コウゴウセイ カッセイ ト ブンコウ ハンシャ シヒョウ ノ カンケイ

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Abstract

We investigated two spectral reflectance indices, the normalized difference vegetation index (NDVI) and the photochemical reflectance index (PRI) as indicators of photosynthetic pigments and photosynthesis in Japanese larch (Larix kaempferi Sarg.) needles. Daily courses of spectral reflectance, photosynthetic pigment concentration and photosynthetic activity (net photosynthetic rate and chlorophyll fluorescence) of the needles were measured in a 4-year-old larch plantation in August 2002. No significant correlations were found between needle pigment concentrations and either index. Although the daily course of net photosynthetic rate correlated with that of NDVI, this relationship varied under weak light conditions in the evening. PRI was significantly linked to epoxidation state in xanthophyll cycle, light use efficiency (LUE) of CO2 assimilation and quantum yield of PS II with higher correlation coefficient than NDVI was. We conclude that PRI is usable for estimating daily changing photosynthetic light use efficiency in larch needles.

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