What determines the spectral reflectance of the Negev-Sinai sand dunes

摘要: Abstract The difference in spectra reflectance between the north-western Negev desert and adjacent Sinai sand dunes has attracted attention of many scientists. Remote sensing analysis three Landsat Multi-Spectral Scanner (MSS) images acquired summer 1984, 1987, 1989, followed by intensive field work, indicate that area is not homogenous undergoing a quick recovery from grazing it suffered 1968 1982. outcome gradual decrease brightness 1984 1989 all MSS bands except band 7 which shows very little or no change with time. This due to increase biogenic crust vegetation cover. bare opposite trend but 7, an probably effect further destruction after In northern part area, are low, have high percentage fines...