Temporal variation of FPAR in the alfalfa pasture
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Abstract
The AccuPAR Plant Canopy Analyzer was used to measure the alfalfa pasture canopy PAR during the flowering period in the Hulunbeier regions, including the incident PAR, the reflective PAR of the canopy, the transmittance of PAR through the canopy, the reflectance of land surface. Based on the PAR data, this study analyzed the temporal Variation of FPAR in the Alfalfa pasture, and showed that the incident PAR and the transmittance PAR diurnal variation was a curve of sine, and the diurnal FPAR variation was a double peak curve in clear day. FPAR was found to be highest in 2:30 am, and the lowest near to 11:30 pm. The daily average of FPAR may be approximated the incident FPAR values when the solar zenith angle was 80 at 7:30.
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