The effect of soil moisture on the reflectance spectra correlations in beech and sessile oak foliage

Attila Eredics, Z. Németh, Rita Rákosa, Ervin Rasztovits, Norbert Móricz, Péter Vig

Research output: Contribution to journalArticle

Abstract

Reflectance intensities of foliage are mostly due to biomaterials synthesised by plants. Adaptation to the continuously changing environment requires the regulated alteration of metabolic processes, which also influences the UV-VIS (Ultraviolet-Visible) and IR (Infra Red) spectra of leaves. For the calculation of various Vegetation Indices (VIs), e.g. NDVI (Normalized Difference Vegetation Index), the common practice is to use the reflectance spectrum of the whole foliage and when individual leaves of the same plant are sampled, an average VI is derived. On the contrary, our method exploits the small differences between individual leaves of the same plant, making use of the similar distributions of measured reflectance values. Using particular wavelength pairs, linear regressions of reflectance intensities have been investigated. The parameters of these regressions (slope and intercept) have been compared to the temporal variations of the environmental factors, such as temperature, vapour pressure deficit and soil moisture. By assessing the sensitivity of the regression coefficient (slope) to the changing environment, wavelength pairs can be selected whose sensitivity change reflects the effect of soil moisture deficit on the plant. Based on the state-dependent correlations of the reflectance spectra of plant foliage, a new concept is presented that is capable of indicating the level of environmental stress, e.g. drought stress.

Original languageEnglish
Pages (from-to)9-25
Number of pages17
JournalActa Silvatica et Lignaria Hungarica
Volume11
Issue number1
DOIs
Publication statusPublished - 2015

Fingerprint

Fagus
foliage
reflectance
Quercus
soil moisture
soil water
leaves
vegetation index
wavelengths
wavelength
drought stress
environmental stress
biocompatible materials
vapor pressure
NDVI
temporal variation
environmental factor
effect
oak
water stress

Keywords

  • State-dependent correlation
  • Stress
  • UV-VIS and IR spectrometry

ASJC Scopus subject areas

  • Forestry

Cite this

The effect of soil moisture on the reflectance spectra correlations in beech and sessile oak foliage. / Eredics, Attila; Németh, Z.; Rákosa, Rita; Rasztovits, Ervin; Móricz, Norbert; Vig, Péter.

In: Acta Silvatica et Lignaria Hungarica, Vol. 11, No. 1, 2015, p. 9-25.

Research output: Contribution to journalArticle

Eredics, Attila ; Németh, Z. ; Rákosa, Rita ; Rasztovits, Ervin ; Móricz, Norbert ; Vig, Péter. / The effect of soil moisture on the reflectance spectra correlations in beech and sessile oak foliage. In: Acta Silvatica et Lignaria Hungarica. 2015 ; Vol. 11, No. 1. pp. 9-25.
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