Simulation of the landform change process on a purple soil slope due to tillage erosion and water erosion using UAV technology  

作　　者：YANG Chao SU Zheng-an FAN Jian-rong FANG Hai-dong SHI Liang-tao ZHANG Jian-hui HE Zhou-yao ZHOU Tao WANG Xiao-yi 

机构地区：[1]Key Laboratory of Mountain Hazards and Earth Surface Processes,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China [2]Research Center for Digital Mountain and Remote Sensing Application,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China [3]University of Chinese Academy of Science,Beijing 100049,China [4]Institute of Tropical Eco-agriculture Sciences,Yunnan Academy of Agricultural Sciences,Yuanmou 651300,China [5]Forestry College,Sichuan Agricultural University,Chengdu 611130,China

出　　处：《Journal of Mountain Science》2020年第6期1333-1344,共12页山地科学学报（英文）

基　　金：supported by the National Key Research and Development Program of China(2017YFC0505102);the National Natural Science Foundation of China(No.41401313);the Major Science and Technology Program for Water Pollution Control and Treatment(2017ZX07101001);the Applied Basic Research Program of Sichuan(2018JY0034);the Major Science and Technology Projects in Sichuan Province(2018SZDZX0034)。

摘　　要：Both tillage erosion and water erosion are severe erosional forms that occur widely on sloping agricultural land.However,previous studies have rarely considered the process of landform change due to continuous simulation experiments of alternating tillage erosion and water erosion.To identify such changes,we applied a scouring experiment(at a 60 L min-1 water discharge rate based on precipitation data from the local meteorological station and the catchment area in the Yuanmou County,Yunnan Province,China)and a series of simulated tillage experiments where plots were consecutively tilled 5,10,and 15 times in rotation(representing 5 yr,10 yr,and 15 yr of tillage)at slope gradients of 5°,10°,and 20°.Close-range photogrammetry(CRP)employing an unmanned aerial vehicle(UAV)and a real-time kinematic global positioning system(RTK-GPS)was used to measure landform changes,and highresolution digital elevation models(DEMs)were generated to calculate net soil loss volumes.Additionally,the CRP was determined to be accurate and applicable through the use of erosion pins.The average tillage erosion rates were 69.85,131.45,and 155.34 t·hm-2·tillage pass-1,and the average water erosion rates were 1892.52,2961.76,and 4405.93 t·hm-2·h-1 for the 5°,10°,and 20°sloping farmland plots,respectively.The water erosion rates increased as tillage intensity increased,indicating that tillage erosion accelerates water erosion.Following these intensive tillage treatments,slope gradients gradually decreased,while the trend in slope gradients increased in runoff plots at the conclusion of the scouring experiment.Compared to the original plots(prior to our experiments),interactions between tillage and water erosion caused no obvious change in the landform structure of the runoff plots,while the height of all the runoff plots decreased.Our findings showed that both tillage erosion and water erosion caused a pseudo-steady-state landform evolutionary mechanism and resulted in thin soil layers on cultivated land composed of purple soil in Chi

关 键 词：Landform change Tillage erosion Water erosion Close range photogrammetry Erosion pins Runoff plot 

分 类 号：S157[农业科学—土壤学]