暴雨条件下黄土高原荞麦地的沟蚀特征OA北大核心CSTPCD

[Objective]The aims of this study are to explore the erosion characteristics of buckwheat fields on the Loess Plateau under heavy rain conditions,to try to analyze the potential influencing factors,and to provide a reference for the management of slope farmland on the Loess Plateau.[Methods]The rainstorm event of 10 th July 2022 in Dingbian,Shaanxi Province were taken as an example.The features of gully erosion on buckwheat land were analyzed based on a combination of remote sensing and field measurements,and the influences on gully erosion on buckwheat land were investigated.[Results](1)The gully heads within buckwheat farmland affected by severe rainfall tended to form where they intersected with other land types.(2)The average width and depth of rill erosion varied between 5.2 to 29.5 cm and 2 to 19.6 cm,respectively.The ratio of width to depth and the gully density ranged from 0.88 to 3.782 and 0.028 to 1.56 m/m2,respectively.The erosion intensity of rill erosion was at a maximum of 20 294.66 t/km2.(3)The ephemeral gully had an average width and depth ranging from 37.3 to 173 cm and 8 to 30.7 cm,respectively.The ratio of width to depth and gully densities were 2.161～18.750,and 0.003～0.142 m/m2,respectively.Additionally,the maximum intensity of ephemeral gully erosion was 31 629.83 t/km2.(4)The gully erosion in buckwheat fields was affected by the slope,length of slope,upstream catchment area,and the measures taken by neighbouring plots.[Conclusion]Compared with other land types such as grasslands and mulched cornfields,gully erosion of the buckwheat slope cropland under heavy rainfall conditions is more severe,and reaches to the intensity of intense erosion.