Vertical distribution characteristics of soil mercury and its formation mechanism in permafrost regions:A case study of the Qinghai-Tibetan Plateau

作     者：Yali Liu Junfeng Wang Junming Guo Luyang Wang Qingbai Wu 

作者机构：State Key Laboratory of Frozen Soil EngineeringNorthwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of SciencesBering 200049China State Key Laboratory of Cryospheric ScienceNorthwest Institute of Eco-environment and ResourcesChinese Academy of Sciences(CAS)Lanzhou 730000China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2022年第34卷第3期

页      面：311-321页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 082803[工学-农业生物环境与能源工程] 08[工学] 0828[工学-农业工程] 09[农学] 0903[农学-农业资源与环境] 

基　　金：This work was supported by the National Natural Science Foundation of China(No.41771080) 

主　　题：Total soil mercury Qinghai-Tibetan Plateau Alpine ecosystems Permafrost Mercury migration 

摘      要：Continuing permafrost degradation is increasing the risk of mercury(Hg) exposure in the permafrost regions on the Qinghai-Tibetan Plateau(QTP),but related studies are still limited,especially the ones on the detailed Hg migration processes in *** vertical distribution characteristics of soil Hg were investigated in three ecosystems in the Beiluhe area on the QTP,and its influencing factors and formation mechanism were *** results indicate that the total soil mercury(THg)concentration in the Beiluhe area remains at an extremely low level(6.33±2.45 ng/g).In the vertical profile,the THg concentration of the shallow soil layer(0-50 cm)(5.96±2.22 ng/g)is significantly lower than that of the deep layer(50-400 cm)(7.44±2.71 ng/g)(p0.05).Within the upper 50 cm,the THg concentration decreases with soil depth,and the peak THg concentration occurs at 100-300 cm on the entire *** the THg concentration is slightly affected by the organic matter in the shallow soil layer,in general,the soil parent material is the dominant factor affecting the THg *** weathering results in a low THg concentration in the shallow soil layer because the soil Hg is carried downward with the soil *** a certain depth,the impermeable frozen soil layer intercepts the flow of the soil Hg,and it forms a Hg enrichment *** paper presents the distinctive pattern of the soil Hg distribution in the permafrost regions of the QTP.