S Jacquentottdl S L Ustinl J Ve t2 G Schmuck2 G Andreoli2 B

pefav - B Hosgo

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?WOSPECZ'REDUX S. Jacquentottdl, S.L. Ustinl, J. Ve_t2, G. Schmuck2, G. Andreoli2, B. Hosgo@ 1University of California Land, Air, and Water Resources, Davis, CA 95616, USA 2 Joint Research Centre, IRSA/AT, 21020 Ispra (VA), Italy 1. INTRODUCTION The remote estimationof leaf biochemical content from spaceborne platforms has been the subject of many studies aimed at better understanding of terrestrial ecayatem ftmctiotting. The major ecological processes involved in exchange of matter and rmergy, like photosynthesis, primary productions evapotranspimtion, respiration, and kompoaition can be related to plant properties e.g., chlor@yll, water, protein, cellulose and Iignin contents (Peterson, 1991). As leaves represent the most important plant aurfkma interacting with solar energy, a top priority has been to relate optical pmperth to biochemical constituents. Two different approaches have been considerd fw, smdsdeal comelations between the Ieafreflectance (or transmittance) and biochemical contenL and stxond, physically breed models of leaf scattering and -On dew- using Ihe laws of optics. Recen?ly reviewed by Verdebout et al. (1994), the development of models of leaf optical properdes has resulted in better understanding of the interaction of light with plant leaves. Present radiative transfer models mainly use chlorophyll and /or water contents as input parameters to calculate leaf reflectamx or (Jacquemoud and BareL 19$X% Fukshanaky et aL, 1991; Yamada and Fujimura, 1991; Martinez v.