关键词: 土壤风蚀, ¹³⁷Cs背景值, ¹³⁷Cs风蚀模型, 蚀积平衡, 共和盆地

Abstract: Analyzing results of the ¹³⁷Cs distribution along soil profile suggest that the cold grassland that maintained the relatively perfect profile of original ¹³⁷Cs fallout can be regarded as ideal sampling site of ¹³⁷Cs reference.Therefore the value of ¹³⁷Cs reference inventory of the Gonghe Basin is calculated to be(2 691.78±196 08) Bq·m^-2 at the site of RS7,which is close to the globe average of the Northern Hemisphere.The depth distribution of ¹³⁷Cs activity fits the peak type remarkably,and comparing with the exponential type regarded as classical and theoretical one,it exhibites the descent of peak layer and smoothing of the ¹³⁷Cs curve,which is possibly related to stable infiltration of ¹³⁷Cs in recent decades.Therefore by means of the ¹³⁷Cs model derived from the ¹³⁷Cs reference distribution,the rate of wind erosion on the four sampling plots was estimated,and then transforming the point erosion estimates to the area,the rate of wind erosion in the Gonghe Basin averaged 12 556 t·hm^-2·a^-1,which is in according with the erosion deposition equilibrium with a relatively small error less than 10%.

Key words: wind erosion, ¹³⁷Cs reference inventory, ¹³⁷Cs model, erosion-deposition equilibrium, Gonghe Basin