- Thirdly,accordingtotheresearchneeds,selectedgullylength,gullywidth,gullydensityandverticalslopeastheevaluationindex.Theyclamberedupanarrowgully.Thehorsegallopedforward,andthegullyandgullywascoveredbywhitesnow.SoilerosioninhillygullyregionoftheLoessPl...
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