Rainfall intensity profile induced changes in surface‒subsurface flow and soil loss as influenced by surface cover type:A long-term in situ field study  

作　　者：Jian Duan Haijin Zheng Lingyun Wang Yaojun Liu Minghao Mo Jie Yang 

机构地区：[1]Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention,Jiangxi Academy of Water Science and Engineering,Nanchang,Jiangxi,330029,China [2]Jiangxi Provincial Technology Innovation Center of Ecological Water Engineering in Poyang Lake Basin,Nanchang,Jiangxi,330029,China [3]School of Geographic Sciences,Hunan Normal University,Changsha,410081,China

出　　处：《International Soil and Water Conservation Research》2025年第1期27-42,共16页国际水土保持研究(英文)

基　　金：supported by the National Natural Science Foundation of China(42107378);the Human Resources-Related Program of Jiangxi Province(20232BCJ23032);the Natural Science Foundation of Jiangxi Province(20232BAB203081);the Science and Technology Project of Jiangxi Province(2022KSG01001,202426ZDKT06).

摘　　要：Due to global warming,changes in the rainfall intensity profile(i.e.,the temporal intensity distribution within a rainfall event)increase the difficulty of accurate erosion prediction and control.Surface cover has been widely used as a critical measure to control soil erosion worldwide.However,the effects of the rainfall intensity profile(RIP)on soil erosion under different surface covers are not fully understood.In this study,long-term in situ field observations of the rain hyetograph,surface runoff coefficient(SRC),subsurface flow rate(SFR),and soil loss rate(SLR)from bare land,litter cover and grass cover were conducted over 11 consecutive years in the red soil hilly region of southern China.According to the occurrence time of the most intense rainfall,226 erosive events were classified into four RIP patterns:advanced,intermediate,delayed,and uniform patterns.The results indicated that the advanced pattern with short durationehigh intensity and the delayed pattern with long durationehigh depth contributed to 73.45% of the total erosive events.For bare land,advanced events were the dominant pattern producing surface runoff and soil erosion,accounting for 57.24%and 75.17%,respectively,of the total surface runoff and erosion.The average SRC and SLR from the advanced pattern were 1.29-2.42 times and 2.52-39.78 times greater than those from the other patterns,respectively.The delayed pattern contributed to subsurface flow,and the average SFR was 1.27e2.17 times greater than that of the other patterns.Furthermore,surface cover significantly reduced surface runoff and erosion and increased subsurface flow,especially under the advanced pattern.Both surface cover measures were equally effective in controlling surface runoff and erosion,but the increase in subsurface flow caused by litter cover was 1.38 e2.67 times greater than that caused by grass cover.Advanced pattern events increase the erosion risk on red soil slopes,and surface cover effectively weakens the effect of variation in the RIP pattern on soil erosion.Mo

关 键 词：Natural rainfall pattern Subsurface flow Surface runoff Soil erosion Land cover Runoff plots 

分 类 号：S157[农业科学—土壤学]