The Effect of Soil Moisture on the Reflectance Spectra Correlations in Beech and Sessile Oak Foliage

Eredics, Attila and Németh, Zsolt István and Rákosa, Rita and Rasztovits, Ervin and Móricz, Norbert and Vig, Péter (2015) The Effect of Soil Moisture on the Reflectance Spectra Correlations in Beech and Sessile Oak Foliage. ACTA SILVATICA ET LIGNARIA HUNGARICA, 11 (1). pp. 9-25. ISSN 1786-691X

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Abstract

Reflectance inten sities of foliage are mostly due to bio materials synthesised by plant s . A daptation to the continuously changing environment requires the regulated alteration of m etabolic 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) , t he common practice is to use the reflectance spectrum of the whole foliage and when individual leaves of th e 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 distribution s of measured reflectance values . Using particular wavelength pairs, l inear regressions of reflectance intensities have been investigated . T he parameters of th ese regression s (slope and intercept) have been compared to the temporal variations of the environmental factors, such as temperature, vapour pressure deficit a n d soil moisture . By assessing the sensitivity of the regression coefficient (slope) to the changing environment , wavelength pairs can be selected whose sensitivity change reflect s the effect of soil moisture deficit on the plant . B ased 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.

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