CHANGE IN SURFACE MICRO-RELIEF DURING THE COURSE OF SHEET EROSIONAND INTER-RILL EROSION

Zheng Zicheng1,2,3 Wu Faqi3 He Shuqin4 Lai La1 (1 College of Resources and Environment,Sichuan Agricultural University,Chengdu 611130,China)(2 State key laboratory of Earth Surface Processes and Resource Ecology,Beijing Normal University,Beijing 100875,China)(3 College of Resources and Environment,Northwest Agricultural and Forstry University,Yangling,Shaanxi 712100,China)(4 College of Forestry,Sichuan Agricultural University,Ya'an,Sichuan 625014,China)

Micro-relief;Management measures;Change characteristics;Sheet erosion;Inter-rill erosion

A study was carried out using the method of indoor simulated rainfall combined with geostatistical analysis to investigate characteristics of the change in surface micro-relief under four different kinds of management during the course of sheet erosion and inter-rill erosion.Results show that under the effect of rainfall,regardless of intensity,the surface micro-relieves of slopelands,regardless of management pattern,all demonstrated a certain extent of irregularity and inter-grade transfer in elevation in the process of sheet erosion and inter-rill erosion.GradeⅠand GradeⅡ were dominated with moving-out,and only a little was transferred back into Grade Ⅰand GradeⅡeven after the inter-rill erosion phase.Little elevation of the surface micro-relief of Grade Ⅲ moved out,but instead,most of the elevations of other grades moved into Grade Ⅲ,suggesting that in the regions between 0~0.01 m and 0.01~0.03 m deposition of silts occurs readily during the process of sheet erosion and inter-rill erosion.