01730naa a2200169 a 450000100080000000500110000800800410001902400300006010000200009024500930011026000090020352012140021265000250142665300280145170000180147977300630149718267292019-01-28       1951    bl ---       0--  u    #d7 aDOI: 10.2307/24378202DOI1 aBILLINGS, W. D.  aReflection of visible and infrared radiation from leaves of different ecological groups.  c1951  aThe importance of reflection of light in the energy relations of leaves was first pointed out several years ago by Shull (1929). Up to the time of Shull's experiments only a few scattered measurements had been made of the reflection of monochromatic light from leaf surfaces. These works were adequately reviewed in Shull's paper. Monochromatic reflectance from 400 mlu to 1100 mlu was measured by means of a Beckman DU spectrophotometer from the upper leaf surfaces of twenty species of plants selected from five environments in the western Great Basin. Four species were employed from each location. The environments represented ranged from the desert to an open subalpine slope through three distinct wooded stations. Determinations were made in triplicate for each species at each location and the averages were plotted as curves. In general, the reflectance curves of green leaves showed values of about 5 per cent at 400 mju rising to a peak of about 15 per cent at 550 mnu with a gradual slope down to about 5 or 6 per cent at 675 mlu. Above this wave-length, the curves rose steeply to a plateau of approximately 50 per cent reflectance in the infrared region extending from about 775 mju to 1100 mju.  aSensoriamento Remoto  aRadiação atmosférica1 aMORRIS, R. J.  tAmerican Journal of Botanygv. 38, n. 5, p. 327-331, 1951.