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Erosion and covered zones altered by surface coverage effects on soil nitrogen and carbon loss from an agricultural slope under laboratorysimulated rainfall events

查看全文 作　　者：Linhua [1,2]Wang;Haw [3]Yen;Chi-hua [2]Huang;Yafeng [2,4]Wang 高影响力作者 机构地区：[1]Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems,South China Botanical Garden,Chinese Academy of Sciences,Guangzhou,510650,China;[2]USDA-ARS National Soil Erosion Research Laboratory,West Lafayette,IN,47907-2077,USA;[3]Blackland Research and Extension Center,Texas A&M Agrilife Research,Texas A&M University,Texas,76502,USA;[4]Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing,100101,China高影响力机构 出　　处：《International Soil and Water Conservation Research》索引2022年第10卷第3期,共11页高影响力期刊 基　　金：This work was financially supported by the National Nature Science Foundation of China(41807176,41971134). 摘　　要：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 between 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 concentrations 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. 关 键 词：Erosion regimes Carbon and nitrogen loss Surface coverage Coverage position
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