WIND EROSION MEASUREMENT ON FALLOW LANDS OF YAZD-ARDAKAN PLAIN, IRAN

摘要: Wind erosion is a significant problem on 20 million ha of Iran, especially in central plains and coastal areas. Winderosion samplers, meteorological equipments measurement procedure have been developed over the last twocenturies to measure particles moving across field modes creep, saltation suspension. In recentresearch as first technical wind was measured with these advanced procedures. Fielddata collected from small (1.9 ha), square, fallow nonerodible boundaries. erosionmeasurement equipment containing 14 clusters samplers at 0.05, 0.10, 0.25, 0.50 1.0m above soilsurface 4× surface creep sampler (0 0.02m height by 0.005m wide) arranged circular pattern. Thesampling cluster consisted an array five each attached pivoting vane mounted adifferent pole. This permitted data collection regardless direction andprovided range lengths minimum number locations. A combination equation power andexponential functions expressed variation transition material 2m. An exponential modeldescribed horizontal distribution transported soil field. Twelve single events were recorded analyzedbetween May 2006 2007. Several inherent properties such texture, organic matter calciumcarbonate content affect erodibility change very slowly research time. Other properties, assurface roughness aggregate crust strength are temporal rapidly response climatic conditions.Total mass 220.93 kg/m per year loss 1.356 kg/m2(13.56 ton/ha) year.