Spatial distribution characteristics and influencing factors of unpaved road gullies in the mollisol region of songnen
[Objective]Erosion gully management is a crucial aspect in the conservation of Mollisols,but the distribution pattern of unpaved road gullies at the regional scale has not yet been clarified,which seriously impedes the process of erosion gully man-agement.In order to clarify the distribution characteristics and influencing factors of unpaved road gullies at the regional scale,[Methods]taking the Songnen Mollisol region as an example,this paper systematically establishes 886 small watershed units and comprehensively uses the inverse distance weighted interpolation,hotspot analysis and random forest model feature selection to explore the spatial characteristics and influencing factors of unpaved road gullies based on high-resolution remote sensing images from Google Earth.[Results]The result show that:(1)14.45%of the sampled units in the Songnen Mollisol region have un-paved road gullies,with an average gully length of 232.27 m,average length density of 0.11 km·km-2,and average number density of 0.46 gullies·km-2.(2)Regions with high unpaved road gully length density and number density are distributed in the northeastern Manchurian plain region(at the junction of Qiqihar,Suihua,and Heihe,and the northwestern part of Harbin),the southeastern low mountainous region(northeast of Changchun),and the northwestern mountainous region(southeast of Hulunbuir and the junction of Qiqihar).(3)The contribution of slope gradient,precipitation and elevation to the unpaved road gully density showed slope gradient>precipitation>elevation.Unpaved road gullies are most densely distributed in the 4°～6° slope gradient range,the 270～300 m elevation range,and in areas with precipitation levels exceeding 600 mm.[Conclusion]The result show that:Except for the central and southwestern regions,there are unpaved road gullies and they are distributed in bands along the boundary of the Songnen Mollisol region;Slope gradient,precipitation,and elevation are the main factors influ-encing the formation and development of unpaved road gullies in the Songnen Mollisol region,with slope gradient being the most significant factor;The method of visual interpretation of sub-meter remote sensing images combined with systematic sampling is reliable and applicable to the study of unpaved road gullies at the regional scale,providing theoretical support for the management of unpaved road gullies and the protection of black soil resources in the region.
mollisol region of the Northeastsub-meter remote sensing imagegully erosionunpaved road gulliesinfluencing factorsprecipitation
万方数据
维普
