Contribution of Asian dust to soils in Southeast China estimated with Nd and Pb isotopic compositions  

作　　者：Jianwu Li Zhaoliang Song Lukas Van Zwieten Li Ruan Feili Li 

机构地区：[1]Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province,Zhejiang A&F University,Hangzhou 311300,China [2]National Center for Tea Plant Improvement,Tea Research Institute,Chinese Academy of Agricultural Sciences,Hangzhou 310008.China [3]New South Wales Department of Primary Industries,1243 Bruxner Highway,Wollongbar,NSW 2477,Australia [4]Institute of the Surface-Earth System Science Research,Tianjin University,Tianjin 300072,China [5]College of Environment,Zhejiang University of Technology,Hangzhou 310014,China

出　　处：《Acta Geochimica》2020年第6期911-919,共9页地球化学学报（英文）

基　　金：the China Natural Science Foundation(Nos.41877006 and 41930862);we also express great thanks to Hailong Wang for his assistance in language polishing.

摘　　要：Asian dust has been identified in subtropical soils of China.Neodymium(Nd)and lead(Pb)elemental and isotopic geochemistry of soils in Southeast China were used to assess the significance of local versus extraneous sources.The εNd(0)values were close to the parent rocks(+2.9)in the young soils(NSJ);while their values were always negative(〜—3.7)in the old soils(OMJ),implying dust deposition.The young soils contained less Asian dust contribution(<8%)while the old soils contained more than 50%Asian dust contribution.This implied that dust contributions were gradually increasing with the soil development stage and Asian dust input had become the principal Nd source for the old soils in this area.On the other hand,Pb excesses and low 207Pb/206Pb values(〜0.8503)in near-surface soils indicated a significant anthropogenic Pb addition onto surface soils.The close relationship between the Pb content and isotopic ratios in the soil profile indicated that the excessive lead in the surface soil was exogenous.These results suggested that Asian dust made up a significant fraction in the old soils,but that local sources(i.e.,basalt and anthropogenic)were not trivial in Southeast China.

关 键 词：Aeolian dust Soil genesis Rural soils BASALT 

分 类 号：S153.6[农业科学—土壤学]