FPAR

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PAR curve of sunlight with a clear sky
PAR curve of sunlight under the "canopy" of wheat; the difference between the two radiation intensities corresponds to the proportion of radiation used by photosynthesis

FPAR or FAPAR ( English Fraction of absorbed Photosynthetic Active Radiation ; stock: Group of photosynthetically active radiation ) describes the fact of the vegetation absorbed proportion of the radiation , the theoretically for the photosynthesis would be available ( wavelength of 0.4 to 0.7 microns ). Therefore, it is a dimensionless biophysical variables that together with the leaf area index allows (BFI, English LAI of leaf area index) a description of photosynthesis and thus the state of the vegetation. FPAR and LAI may be partially from a great distance, for example by satellite from, can be determined, which is why they frequently used parameters to describe and monitoring of ecosystems are.

literature

  • RB Myneni, RR Nemani, NV Shabanov, Y. Knyazikhin, JT Morisette, JL Privette, SW Running: LAI and FPAR . (English, full text at NASA [PDF]).