辽西薄层土区垂直垄向随机粗糙度的降雨响应 与稳糙阈值

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中图分类号：S157.1 文献标志码：A 文章编号：1008-0562（2026）02-0232-10

Abstract： To investigate the dynamic response law of vertical ridge random roughness （ （Cr） under the coupling conditionof“prolonged drought-rainstorm-thin soil”in the low mountain and hilly area of western Liaoning， fournatural rainfalls from June to September2O22 were analyzed，and the Cr values of slope surface under seven soil and water conservation measures were dynamically monitored. Combined with runoff coefficient （R） and soil physical and chemical properties，the response mechanism and stability mechanism of Cr to rainfall were analyzed. The results showed that the Cr valueshowed a dominant effect of early rain，and the ΔCr before and after the first rainfall was 90.40% .When the rainfall intensity is greater than or equal to 18.82mm/h ， Cr enters the 'highrainfall intensitysaturation' stage，and itschangerate tends tobe stable.There was a significant negative correlation between R and Cr only when the rainfall intensity was greater than or equal 18.82mm/h （p<0.01） ，and the mechanism could be atributed to the filling effct of runoff.Soil clay content was always significantly negatively correlated with Cr （p<0.01） .The inhibitory roughness effect of soil organic matter（SOM） decreased withtheextensionofrainfallduration，whilethe inhibitoryroughness effectofsoil bulkdensity（BD） increased with the increase of cumulativerainfall，forming a dynamic complementary barrier effect.Because of the combinationcharacteristicsof 'highclay，highorganicmater，lowbulk densityandlowrunoffcoefficient'，the Cr baseline value and ΔCr offorest land and fruit tree terrace are the lowest， showing the best stability.The research conclusions provide a theoretical basis for soil erosion prediction and optimization of soil and water conservation measures in thin soil areas.

Keywords：low mountain and hilly region;vertical ridge-oriented random roughness;rainfall characteristics; runoff coefficient; soil clay content; soil organic matter; soil and water conservation measures

0 引言

垂直垄向随机粗糙度 Cr 是反映坡面水沙过程的关键指标，其动态变化直接影响径流形成、泥沙输移及养分流失。（剩余17730字）