Observed Effects of Humus, Salt Contents and Soil Contamination on the Microwave Emissivity of Soils

摘要

Multi-temporal multi-frequency passive techniques have been employed in order to make comparative research of microwave emissivity of soil plots with different salt, humus and impurity content. It has been established that humus, salt and impurity has an effect on the soil structure at the saturated state and on pace of soil water evaporation. Soils polluted with mineral oils most dry up fast of oil, salted soils slowly dry up. The experiment with radiometers, 2.7, 6.0 and 8.2 GHz, revealed the changes in radiobrightness temperature are related which the concentration of the substances listed above. At evaporation in a surface layer of soils with various contaminations there are various gradients of moisture. Because of that the radiobrightness temperatures on different wavelengths can hardly differ. In the article it is shown, that it is possible to distinguish the plots with different humus, salt contents and soil contamination under identical meteorological conditions by the remote sensing method.