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Vegetatio

, Volume 48, Issue 3, pp 219–226 | Cite as

Estimation of phenological stages and physiological states of grasslands from remote sensing data

  • C. M. Girard
Article
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Abstract

Two radiometers measuring reflectance factors have been used at a height of 1.50 m above some grasslands in C. France. The results show that both spectral data are sensitive to the photosynthetic activity of the grassland. Measurements made in April, May, June and July show that grasslands have quite different spectral behaviour according to soil conditions or to grazing level. Grasslands on dry or wet soils may be separated from those of normal soils for which overgrazing and trampling affecting the growth of species, are shown by the different spectral values. Such ‘on the ground’ remote sensing measurements may then be proposed for evaluating the range of growth and development of different grasslands.

Key words

Correspondence analysis Grassland Infrared/red ratio Phenological stages Radiometer Reflectance curve Reflectance factor Spectral behaviour 

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Copyright information

© Dr W. Junk Publishers 1982

Authors and Affiliations

  • C. M. Girard
    • 1
  1. 1.Laboratoire de Botanique et Ecologie VégétaleInstitut National Agronomique Paris-GrignonThiverval-GrignonFrance

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