Soil erosion,one of the most serious environmental concerns,might remove topsoil and essential element from terrestrial land.However,few attentions have been given to investigating how soil erosion regimes affect soil carbon and nitrogen loss.Therefore,this study investigated the effects of surface coverage rates(83％,67％,50％,33％,17％and 0％)and two positions(up-and downslope)on erosion regimes and its associated soil nitrogen and carbon loss under a sequence of six rainfalls(R1-R6).These results showed that the sediment concentrations with 33％(R4)and 17％(R5)coverage downslope were significantly lower than those with coverage upslope,whereas there was no significant difference be-tween the runoff rates of the two slopes.Thus,surface coverage at different positions induced two soil erosion regimes(deposition-and transport-dominated processes).Dynamics of the DON and DIN con-centrations indicated different release processes of soil nitrogen into runoff.The DON contributed to a substantial amount of soil nitrogen loss,which accounted approximately 81％of the organic form.The SBOC is significantly correlated with sediment-enriched clay particles from the deposition-dominated processes and is higher than that from the transport-dominated processes.The DOC is significantly correlated with Rr for transport-dominated processes.These results illustrated the critical role of erosion regimes in soil organic carbon loss in dissolved or sediment-bound form.It is concluded that erosion/covered zones altered by surface coverage could produce transport-and deposition-dominated erosion regimes and consequently affect soil carbon and nitrogen loss.In addition,these results demonstrated that surface coverage pattern may efficiently control soil erosion and soil carbon and nitrogen loss.

Linhua Wang;Haw Yen;Chi-hua Huang;Yafeng Wang

Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems,South China Botanical Garden,Chinese Academy of Sciences,Guangzhou,510650,China;USDA-ARS National Soil Erosion Research Laboratory,West Lafayette,IN,47907-2077,USA;Blackland Research and Extension Center,Texas A&M Agrilife Research,Texas A&M University,Texas,76502,USA;Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing,100101,China

国际水土保持研究（英文）

[1]Linhua Wang;Haw Yen;Chi-hua Huang;Yafeng Wang-.Erosion and covered zones altered by surface coverage effects on soil nitrogen and carbon loss from an agricultural slope under laboratory-simulated rainfall events)[J].国际水土保持研究（英文）,2022(03):382-392

SBOC

Erosion,covered,zones,altered,by,surface,coverage,effects,nitrogen,carbon,loss,from,agricultural,under,laboratory,simulated,events,Soil,erosion,most,serious,environmental,concerns,might,remove,topsoil,essential,element,terrestrial,land,However,few,attentions,have,been,given,investigating,regimes,affect,Therefore,this,study,investigated,rates,two,positions,downslope,its,associated,sequence,six,rainfalls,R1,R6,These,results,showed,that,sediment,concentrations,R4,R5,were,significantly,lower,than,those,upslope,whereas,there,was,difference,tween,runoff,slopes,Thus,different,induced,deposition,transport,dominated,processes,Dynamics,DON,DIN,indicated,release,into,contributed,substantial,amount,which,accounted,approximately,organic,form,correlated,enriched,clay,particles,higher,DOC,Rr,illustrated,critical,role,dissolved,bound,It,concluded,could,produce,consequently,In,addition,these,demonstrated,pattern,may,efficiently,control

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