Pertti Hari , Mikko Huhtamaa, Paavo Pelkonen, Veli Pohjonen, Raimo Salminen

A new approach for measuring light inside the canopy in photosynthesis studies

Hari P., Huhtamaa M., Pelkonen P., Pohjonen V., Salminen R. (1976). A new approach for measuring light inside the canopy in photosynthesis studies. Silva Fennica vol. 10 no. 2 article id 4937. https://doi.org/10.14214/sf.a14782

Abstract

Light intensity inside the canopy varies considerably both in space and time. A new apparatus was developed which is disturbed as little as possible by the above-mentioned variation. The construction is based on the linear relationships between light intensity (measured using silicon diodes) and photosynthesis. This procedure permits linear operations (summing and integration) to be carried out on the output of the diodes without any loss of accuracy. There are five diodes in each assimilation chamber. A model, in which the independent variables include ligth, measured with the present equipment, and temperature, fits the photosynthetic rates well even inside the canopy.

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Keywords
photosynthesis; canopy; light intensity; measuring methods

Published in 1976

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Available at https://doi.org/10.14214/sf.a14782 | Download PDF