中国岩溶2017，Vol.36Issue(5)：668-677,10.DOI:10.11932/karst2017y38
广西百朗地下河大石围天坑段金属元素沉积记录
Sedimentary record of metal elements in the Dashiwei sinkhole section of Bailang underground river,Guangxi
摘要
Abstract
In this work,the concentration of metal elements and sediment organic matter (SOM)in sediment cores of the Dashiwei sinkhole section from the Bailang underground river has been studied,and the pollution history of the river basin from 1932 to 2007 has been reconstructed by combining the 210 Pb dating and histori-cal records.The results show that concentrations of main toxic heavy metals Cd and Hg in the sediment cores are high,which are 3.4 and 0.6 times than the soil background values of Guangxi,respectively,even more than 11.2 and 2.7 times of the soil background value throughout China,respectively.On the whole, the distributions of heavy metal elements have a similar increase tendency in the sediment cores.The vertical distribution of metal elements in the sediment cores shows that metal element pollution in the underground river were associated with many events in history,such as peasant movement,the war of Anti-Japanese, Great Leap Forward age,the early stage of reform and opening up ,and the rapid development of economy. Especially,the vertical variation of Ca and Mg in the sediment core records indicates that a new construction climax has begun in this karst mountain area since 1983.Correlation and clustering analyses show that,(1) Cr and Pb came mainly from natural environment,(2)Cu,Ni,Zn,As and MgO originated from natural en-vironment and artificial sources,(3)Cd,Hg,Mn,CaO and SOM stemmed from artificial pollution sources. Correlation analysis with polycyclic aromatic hydrocarbons suggests that part of Zn,Cd and As came from coal combustion.In a nutshell,metal elements in the sediment cores better recorded pollution history of the Bailang underground river.关键词
百朗地下河/金属元素/沉积柱芯/历史记录Key words
Bailang underground river/metal elements/sediment core/historic record分类
资源环境引用本文复制引用
孔祥胜,栾日坚,洪涛,覃小群,祁士华..广西百朗地下河大石围天坑段金属元素沉积记录[J].中国岩溶,2017,36(5):668-677,10.基金项目
中国地质调查局地质调查项目"西江中下游岩溶峰林区1:5万水文地质环境地质调查(DD20160301)"和"滇黔桂岩溶区土地质量地球化学调查(DD20160324)"联合资助 （DD20160301）
