Prediction of the Ratio of Legumes in a Mixed Seeding Pasture by Polarized Reflected Light

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  • 反射光中の偏光測定による混播牧草群落のマメ科率推定

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Reflectance (R), polarized reflectance (Q) and degree of polarization (P) were measured for a mixed seeding pasture consisting of white clover (WC) and tall fescue (TF) in 8 spectral bands in the visible, near-and short-wave infrared wavelength ranges. The radiometer observed the reflected sunlight in a 10° field of view approximately1.6 to 2m apart from each grass canopy. The view zenith angles (Zv) were set from 15° to 75° at 15° intervals, and the observation azimuth was toward the sun. The highest correlation coefficients with the ratio of legumes (ROL, LAI ratio of WC to the total) were obtained for Q in the 660 and 2200 nm bands measured at Zv 60° when Q is multiplied by the cosine of solar zenith angle (Cos Zs) at the time of each observation. The second highest correlation was found between ROL and 660 nm band R with Zv 15°, but P and NDVI showed lower correlations. A multiple regression model that used a Q and 3-band Rs that were all acquired at Zv 60° explained 90% of the variation of ROL with RMSE 11%. Utilizing polarization information of reflected light is effective in estimating ROL of mixed seeding pastures where planophyll and erectophyll plant species coexist.

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