期刊
EUROPEAN JOURNAL OF REMOTE SENSING
卷 48, 期 -, 页码 263-282出版社
TAYLOR & FRANCIS LTD
DOI: 10.5721/EuJRS20154815
关键词
Dryness stress; proximal sensing; fluorescence; imaging spectroscopy; thermal infrared
资金
- German Aerospace Center (DLR) [50 EE 1258]
- Federal Ministry of Economic Affairs and Energy
Photosynthesis rate was measured during the course of a day on a pot of well-watered and a pot of drought-stressed young beech trees. At the same time, hyperspectral visible/near infrared and hyperspectral thermal images of the plants were recorded with a very high spatial resolution from a 3.8 m high platform. Time series of photochemical reflectance index (PRI), sun-induced fluorescence, temperature, and emissivity of the leaves were correlated with the photosynthesis measurements. PRI (R-2=0.72 and 0.78 for well-watered and drought-stressed group, respectively), fluorescence (R-2=0.72 and 0.40), and temperature (R-2=0.62 and 0.69) proved to be good estimators for measured photosynthesis rates, emissivity had weaker correlations (R-2=0.05 and 0.18). High resolution maps of photosynthetic activity could be produced from PRI, fluorescence, and temperature.
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