Migration of organic carbon and trace elements in the system glacier-soil in the Central Caucasus alpine environment  

作　　者：Ivan KUSHNOV Evgeny ABAKUMOV Rustam TEMBOTOV Timur NIZAMUTDINOV 

机构地区：[1]Saint Petersburg State University,7/9 University Embankment,St Petersburg,199034,Russia [2]Tembotov Institute of Ecology of Mountain Territories of Russian Academy of Sciences,7a I.Armand Street,Nalchik,360051,Russia

出　　处：《Journal of Mountain Science》2022年第12期3458-3474,共17页山地科学学报（英文）

基　　金：supported by the Russian Foundation for Basic Research,project No 19-05-50107。

摘　　要：Rapid deglaciation is one of the most important challenges in the Earth science today.One reason of this is specific supraglacial sediments–cryoconites,which represent carbon-containing dust with organomineral matter and living organisms.Investigation of physical and chemical characteristics of cryoconites in the Central Caucasus is necessary in order to understand their influence on alpine territories biogeochemical cycles,pollution and development in conditions of intensive glacial melting and active anthropogenic influence.For this research cryoconites as well as moraines,soil-like bodies and soils have been sampled from the alpine Bezengi Glacier and adjacent Khulamo-Bezengi Gorge.Key physicochemical features(pH values,total organic carbon content,microbial respiration,particle-size distribution)as well as content of trace elements have been defined in sampled materials and several pollution indices(Geoaccumulation index,Contamination factor and Degree of pollution)have been calculated.Results obtained show low values of total organic carbon in cryoconites(max.0.23%)but high values(max.7.54%)in top horizon of soils located in floodplain,indicating its active fluvioglacial transfer which may further accelerate the development of soils.Microbiological activity in the studied soils was mostly influenced by additional input of labile organic carbon from cryoconites with water flows.Particle-size distribution was similar among the studied cryoconites,indicating dominance of sand fraction(up to 85.28%)while studied soils showed higher variability due to influence of weathering.Among the trace elements,cryoconites were mostly polluted by Zn(max.85.70 mg·kg^(-1))which corresponds to high pollution according to pollution indices;Pb(max.24.90 mg·kg^(-1))and Cu(max.17.40 mg·kg^(-1)),up to moderate pollution level.Redistribution of polluted cryoconite material as well as local anthropogenic activities increased pollution of periglacial soils by Zn(max.89.20 mg·kg^(-1)),Pb(max.15.00 mg·kg^(-1))and Cu(max.12.80 mg·

关 键 词：Cryoconites Umbrisols Leptosols Pollution Caucasus mountain range 

分 类 号：S153.6[农业科学—土壤学] P343.6[农业科学—农业基础科学]