水土保持学报2018，Vol.32Issue(1)：121-127,134,8.DOI:10.13870/j.cnki.stbcxb.2018.01.020
近景摄影测量技术在坡耕地土壤侵蚀速率研究中的应用
Application of Close-range Photogrammetry Technology in the Study of Soil Erosion Rate on Slope Farmland
摘要
Abstract
To determinate tillage erosion rate and hydraulic erosion rate of purple soil under different slope gradients,a series of simulated tillage experiments (5,10,and 15 operation tillage) were conducted on 5°,10°,and 20° slope farmlands,respectively.Then a series of scouring experiments with water discharge of 60 L/min were carried out on those slopes.Close-range photogrammetry technology was used to monitor the landform changes of purple slope farmland,and the high resolution digital elevation models (DEMs) were generated to calculate the net soil loss volume.Meanwhile,erosion pins were used to verify the accuracy of close-range photogrammetry technology by measuring the depth variation of soil layer,and the erosion rate and hydraulic erosion rate of purple slope farmland under different slope conditions were calculated.Results showed that the close-range photogrammetry technology was reliable and efficient to monitor landform changes and calculate the soil erosion rates.The calculated results of DEMs were similar to those of erosion pins.The average tillage erosion rates were 69.85,131.45 and 155.34 t/(hm2 · tillage pass) on 5°,10° and 20°purple slope farmland,respectively,and tillage erosion rate showed an increase trend with the increasing of slope gradient,while it decreased with the increasing of tillage intensity.The average hydraulic erosion rates were 1 892.52,2 961.76 and 4 405.93 t/(hm2 · h) on 5°,10° and 20° purple slope farmland,respectively.Hydraulic erosion rate was positively related to the slope gradient.Meanwhile,hydraulic erosion rate showed an increase trend with the increasing of tillage intensity,indicating that tillage erosion would accelerate the hydraulic erosion.These results could provide technical support and data foundation to the studies about soil erosion in purple slope farmland under tillage erosion and hydraulic erosion.关键词
无人机/坡耕地/耕作侵蚀/水力侵蚀/侵蚀速率/坡度/耕作强度Key words
unmanned aerial vehicle (UAV)/slope farmland/tillage erosion/hydraulic erosion/erosion rate/slope gradient/tillage intensity分类
农业科技引用本文复制引用
杨超,苏正安,熊东红,杨鸿琨,徐霞,董一帆..近景摄影测量技术在坡耕地土壤侵蚀速率研究中的应用[J].水土保持学报,2018,32(1):121-127,134,8.基金项目
国家重点研发计划项目(2017YFC0505102) （2017YFC0505102）
国家自然科学基金项目(41401313,41571267) （41401313,41571267）
四川师范大学2017年研究生优秀论文培育基金项目(川师研(2017)17号-42) （川师研(2017）
