滇中中高山丘陵区大气干湿沉降元素地球化学特征及来源解析  

Geochemical characteristics and source analysis of elements from dry and wet atmospheric deposition in the middle-high mountain and hilly region of Central Yunnan

作　　者：徐磊 李俊[1,2] 瞿镪 文方平 赵萌生 程琰勋 徐杰 王浩宇 XU Lei;LI Jun;QU Qiang;WEN Fang-Ping;ZHAO Meng-Sheng;CHENG Yan-Xun;Xu Jie;WANG Hao-Yu(Kunming Natural Resources Comprehensive Survey Center of China Geological Survey,Kunming650100,China;Technology Innovation Center for Natural Ecosystem Carbon Sink,Ministry of Natural Resources,Kunming650100,China)

机构地区：[1]中国地质调查局昆明自然资源综合调查中心,云南昆明650100 [2]自然资源部自然生态系统碳汇工程技术创新中心,云南昆明650100

出　　处：《物探与化探》2023年第6期1602-1610,共9页Geophysical and Geochemical Exploration

基　　金：中国地质调查局地质调查项目(ZD20220211,ZD20220210)。

摘　　要：大气干湿沉降是表层土壤元素的重要输入途径,为探索滇中中高山丘陵区大气沉降物中元素地球化学特征及来源,对滇中3个县采集的35件大气干湿沉降物进行研究。结果表明,养分元素年沉降通量大,重金属元素年沉降通量小,各指标年沉降通量大小顺序为:TOC(总有机碳)>Ca>K>I>F>Zn>B>Pb>Cr>Cu>As>Mo>Cd>Se>Ge>Hg;富集因子、主成分和空间分布特征表明,Ca、Mo、B、As、F主要来源于土壤扬尘,Cu、Cd、Pb、Cr、Ge以矿业活动和煤烟尘等人为源为主,TOC、K、Se、I为煤烟尘和土壤扬尘的混合来源,且Se受矿业活动的影响,Hg来源于煤烟尘。研究区煤炭及以铜为主的多金属矿产资源分布较广并存在一定的矿业活动,大气重金属元素含量与之密切相关,应有针对性地进行大气监测,确保大气环境质量以及不会对土壤造成污染。Dry and wet atmospheric deposition is an essential input pathway for surface soil elements.To explore the geochemical char-acteristics and sources of elements from atmospheric deposition in the middle-high mountain and hilly region of Central Yunnan,this study investigated 35 dry and wet atmospheric deposition samples from three counties in Central Yunnan.The results show that nutrient elements exhibited high annual depositional fluxes,while heavy metal elements manifested low annual depositional fluxes,with their ranking as follows:TOC>Ca>K>I>F>Zn>B>Pb>Cr>Cu>As>Mo>Cd>Se>Ge>Hg.As revealed by the enrichment factors,principal components,and spatial distribution characteristics,Ca,Mo,B,As,and F originated primarily from soil dust;Cu,Cd,Pb,Cr,and Ge were mostly from anthropogenic sources,such as mining activities and coal dust;TOC,K,Se,and I came from both coal dust and soil dust,and Se was also affected by mining activities;and Hg stemmed from coal dust.Coal and copper-dominated polymetallic min-eral resources spread extensively across the study area and are subjected to certain mining activities,which are intimately connected with the contents of heavy metals in the atmosphere.Therefore,targeted atmospheric monitoring should be conducted to ensure atmos-pheric quality and no pollution to soil.

关 键 词：大气干湿沉降 地球化学特征 来源 滇中 

分 类 号：P632[天文地球—地质矿产勘探]