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ON THE MEASUREMENT OF THE RADIANT TEMPERATURE OF VEGETATION SURFACES AND LEAVES
Author(s) -
Stoutjesdijk Ph.
Publication year - 1966
Publication title -
wentia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0511-4780
DOI - 10.1111/j.1438-8677.1966.tb00025.x
Subject(s) - citation , vegetation (pathology) , field (mathematics) , computer science , information retrieval , library science , mathematics , medicine , pathology , pure mathematics
defined. Of course measurements inside a very low vegetation even with very small instruments, offer great practical difficulties as well. Furthermore the strong patchiness of many vegetations made it very desirable to characterize the strong horizontal variation of microclimate by one single quantity which could be measured unambiguously. We therefore tried to find such a factor that could be measured in a well-defined and reproducible way. It was expected that the mean surface temperature of the vegetation might be suitable in this respect, the more so as its relation to ambient temperature and radiation reflects the heat and water economy of the vegetation. With a surface of so irregular a form the only practicable approach seems to derive the temperature of the surface from its heat radiation. When strong daylight does not interfere, a measurement of its heat radiation can be readily made by means of a suitably mounted thermopile or other radiation receptor. By day however, the amount of short-