Use of ^(137)Cs and ^(210)Pb_(ex) fallout radionuclides for spatial soil erosion and redistribution assessment on steeply sloping agricultural highlands  

作　　者：Jung-Hwan YOON Young-Nam KIM Kye-Hoon KIM M.B.KIRKHAM Hyuck Soo KIM Jae E.YANG 

机构地区：[1]Kangwon Institute of Inclusive Technology,Kangwon National University,Chuncheon 24341,Republic of Korea [2]Department of Biological Environment,Kangwon National University,Chuncheon 24341,Republic of Korea [3]Institute of Agriculture and Life Science,Gyeongsang National University,Jinju 52828,Republic of Korea [4]Department of Environmental Horticulture,University of Seoul,Seoul 02504,Republic of Korea [5]Department of Agronomy,Kansas State University,Manhattan,KS 66506-0110,USA

出　　处：《Journal of Mountain Science》2021年第11期2888-2899,共12页山地科学学报（英文）

基　　金：This research was supported in part by Research Grant from Kangwon National University(No.520160156:2016);the Korea Ministry of Environment,with the strategic EcoSSSoil Project,KEITI(Korea Environmental Industry and Technology Institute),Korea(Grant No.2019002820004).

摘　　要：The steeply sloping agricultural highlands in Korea have severe soil erosion.Estimation of both soil erosion and sedimentation in these highlands is necessary to make plans for soil-conservation measures,but it is not feasible using existing soil-erosion models.This study measured the site-specific concentrations of ^(137)Cs and ^(210)Pb_(ex) on both a highland slope(33%slope)and a reference site(undisturbed flat area)to estimate soil erosion and redistribution.The use of the fallout radionuclide(FRN)method was evaluated to see if it is a suitable method for characterizing soil erosion.Results were compared with those obtained with the Universal Soil Loss Equation(USLE),which is an empirical model that estimates annual soil erosion.The average concentrations of ^(137)Cs and ^(210)Pb_(ex) at the reference site were 11.57±0.24 Bq kg^(-1) and 59.74±4.2 Bq kg^(-1),respectively.Concentrations of ^(137)Cs and ^(210)Pb_(ex) in the experimental slope were 16.4%and 10.8%,respectively,of those at the reference site.Radionuclide inventories were lower at the upper point of the slope than those at the basal point of the slope.Concentrations of ^(137)Cs and ^(210)Pb_(ex) were significantly correlated with available phosphorus,organic matter,CEC,and exchangeable cations.Estimation of soil redistribution rate using ^(137)Cs and ^(210)Pb_(ex) showed site-specific variations at different points along the slope,and respective ranges were^(-1)7.46~-207.51 and 1.55~-581.38 Mgha^(-1) yr^(-1),which indicated that more erosion was assessed by ^(210)Pb_(ex) than by ^(137)Cs.Redistribution analysis showed that soil erosion occurred along the entire slope,except for the bottom point of the slope where 1.55 Mgha^(-1) yr^(-1) of sediment accumulated.The USLE provided a single value of the average annual soil loss in the entire slope,which was either 166 or 398 Mgha^(-1) yr^(-1),depending on the soil erodibility factor(soil series factor and calculated factor from soil sample analysis)used in the model.We conclude that the FRN method using

关 键 词：Soil erosion Steep highland Fallout radionuclide ^(137)Cs ^(210)Pb_(ex) USLE 

分 类 号：S157.1[农业科学—土壤学]