Soil interparticle forces can pose important effects on soil aggregate stability and rainfall splash erosion.Meanwhile,these interparticle forces are strongly influenced by specific ion effects.In this study,we applied three monovalent cations(Li+,Na+,and K+)with various concentrations to investigate the in-fluence of specific ion effects on aggregate stability and splash erosion via pipette and rainfall simulation methods.The specific ion effects on soil interparticle forces were quantitatively evaluated by introducing cationic non-classical polarization.The results showed that aggregate stability and splash erosion had strong ion specificity.Aggregate breaking strength and splash erosion rate at the same salt concentration followed the sequence as Li+＞Na+＞K+.With decreasing salt concentration,the difference in aggregate breaking strength or splash erosion rate between different cation systems increased initially(1-10-2 mol L-1)and later was nearly invariable(10-2-10-4 mol L-1).The experimental results were well quantitatively explained by soil interparticle forces considering cationic non-classical polarization.Furthermore,both aggregate breaking strength and splash erosion rate of three cations revealed a strong positive linear relation with net force subjected to cationic non-classical polarization(R2=0.81,R2=0.81).These results demonstrated that different non-classical polarization of cations resulted in different soil interparticle forces,and thus led to differences in aggregate stability and splash erosion.Our study provides valuable information to deeply understand the mechanisms of rainfall splash erosion.

Jingfang Liu;Feinan Hu;Chenyang Xu;Wei Du;Zhenghong Yu;Shiwei Zhao;Fenli Zheng

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,College of Natural Resources and Environment,Northwest A&F University,Yangling,712100,China;Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,712100,China;College of Agricultural Science and Engineering,Hohai University,Nanjing,210098,China

国际水土保持研究（英文）

[1]Jingfang Liu;Feinan Hu;Chenyang Xu;Wei Du;Zhenghong Yu;Shiwei Zhao;Fenli Zheng-.Specific ion effects on soil aggregate stability and rainfall splash erosion)[J].国际水土保持研究（英文）,2022(04):557-564

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