The Relation between Laser-Induced Chlorophyll Fluorescence and Photosynthesis
| Autor: | A. Rosema, J.F.H. Snel, L.W.A. van Hove, W.F. Buurmeijer, H. Zahn |
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| Rok vydání: | 1998 |
| Předmět: |
Meteorologie en Luchtkwaliteit
WIMEK Meteorology and Air Quality Chemistry Analytical chemistry Fluorescence spectrometry Soil Science Geology Photosynthetic pigment Photosynthesis Fluorescence chemistry.chemical_compound Photosynthetically active radiation Chlorophyll Botany Life Science Laboratorium voor Plantenfysiologie EPS Computers in Earth Sciences Chlorophyll fluorescence Laboratory of Plant Physiology Remote sensing Photosystem |
| Zdroj: | Remote Sensing of Environment 65 (1998) Remote Sensing of Environment, 65, 143-154 |
| ISSN: | 0034-4257 |
| DOI: | 10.1016/s0034-4257(98)00020-0 |
| Popis: | The remote sensing literature on laser-induced chlorophyll fluorescence has indicated a relation between chlorophyll fluorescence and photosynthesis but, so far, has not presented a quantitative interpretation of the measurements. The present article presents the development of a model to quantify the gross photosynthesis on the basis of remote measurements of chlorophyll fluorescence and radiance with the Laser Environmental Active Fluorosensor (LEAF-NL). Combined measurements of the laser-induced chlorophyll fluorescence and CO 2 exchange have been carried out during several days. Drought and ozone stress were imposed in two separate experiments. The laser-induced fluorescence measurements show a remarkable behavior. After sunrise the fluorescence yield rises first, but at high radiation and high temperature the fluorescence yield may decline below the nighttime fluorescence. This extremely strong quenching of fluorescence is attributed to photosystem deactivation. On the basis of the available laser-induced fluorescence data, a photosystem energy partitioning model is developed and finally used to predict photosynthetic electron transport. The results of this new model are compared with those of the current theory and with the CO 2 assimilation data. Contrary to the current theory, the results from the new model show a fairly good correspondence with the CO 2 assimilation data. It is believed that the present results are a significant step forward to the development of practical applications. |
| Databáze: | OpenAIRE |
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