Experimental Study for Estimation of Leaf Area Index (LAI) and Vigor Using Transmitted Spectral Properties

DOI JASI Web Site Web Site 10 References

Bibliographic Information

Other Title
  • 透過光植生指数を用いた森林の葉面積指数および乾燥ストレスの推定に関する実験的研究
  • トウカコウ ショクセイ シスウ オ モチイタ シンリン ノ ヨウメンセキ シスウ オヨビ カンソウ ストレス ノ スイテイ ニ カンスル ジッケンテキ ケンキュウ

Search this article

Abstract

As one of the method for estimating the the amount of leaves and forest vigor, we examined the usefulness of the properties of light spectrum obtained from the measurement of canopy reflectance and transmittance into the floor of model forests consisting of 3-year old Quercus glauca THUNB. We analized the changes of spectral curve in the visible and near-infrared wavelength and (VI) derived 6 Vegetation Indices from spectral data. From regulation analysis results VIs derived from transmittance were more positively related to LAI variations than VIs from reflectance under dense canopy. This means that transmittance is more sensitive to the LAI variation than reflectance. We also found that changes of VIs, such as R/NIR and ND VI, derived from transmittance, were linearly related to decline in vigor caused by water stress. These results confirm that the properties of transmitted spectrum could be more useful for estimation of LAI and the vigor of forests than reflected spectrum, and VIs derived from the transmitted light inside the forest should be useful as a new method for monitoring forests, and contribute to studies for developing new methods.

Journal

References(10)*help

See more

Details 詳細情報について

Report a problem

Back to top