【摘要】 通过对吉尔吉斯斯坦境内40个不同采样环境下采集的表土中元素含量的分析,结合系统聚类(HCA)、降趋势对应分析(DCA)等方法,研究了吉尔吉斯坦境内不同采样环境下表土中元素的组合差异及其控制因素。结果表明:(1)大部分路边采集的表土、农田采集的表土和河边采集表土在聚类分析中各自组成独立的类别,显示出具有不同于其它采样环境下表土的元素组合特征。(2)由于Ca、Mg、Sr在表生地球化学上具有一定共性,这些活动性元素容易发生相对明显的迁移或富集,DCA分析显示其与Al、Fe等稳定性元素的相对含量存在反相关,Ca、Sr、Mg等含量高低直接影响了Al等稳定元素的相对含量。P、Pb、Zn、Cu与Al、Fe、Ti等稳定元素含量受不同的影响因素控制。在上述基础之上,结合不同采样环境下表土中元素含量的对比分析,路边采集的表土中Pb、Zn、Cu元素富集显著,而农田采集的表土中P和Cu元素明显富集,反映了P、Pb、Zn、Cu元素已经受到了人为因素的影响,导致在DCA分析中具有不同于Al、Fe等稳定元素的显著特征。更多还原

【Abstract】 Forty topsoil samples were collected from Kyrgyzstan in 2012. Using the methods of hierarchical cluster analysis(HCA)and de-trended correspondence analysis(DCA),the element contents of surface soils were analyzed for revealing the character of element assemblages and its controlling factors. The results showed as follows:(1)the element assemblages of most roadside topsoil,agricultural land topsoil and topsoil along the rivers are different from the other topsoils. Some soils collected from farmlands and roadsides are controlled by the anthropogenic influence.(2)The geochemical mobile elements(Ca,Mg and Sr)have some similarities in supergenic geochemical process,which are prone to relatively significant migration or enrichment. The content variations of Ca,Mg and Sr control the relative contents of the remaining elements(Al,K,Fe,Ti,etc.). Through the de-trended correspondence analysis,the elements(P,Pb,Zn and Cu)and the stable element(Al,Fe,etc.)are controlled by different factors.The roadside topsoil is rich in Pb,Zn and Cu,and P and Cu are significantly enriched in agricultural land soil,which shows that the elements of P,Pb,Zn and Cu have been influenced by anthropogenic factors. The element contents of Pb,Cu and Zn in the soils collected from roadsides are approximately higher than the average value of 235%,91.3%and 135.7%,respectively. The elements of P and Cu also have relatively higher levels in the topsoil of farmlands.The element contents of P and Cu in the soils are higher than the average value of 74.4% and 24%. Overall,it is useful to study the characteristics of element assemblages in the surface soil for environmental quality assessment and the comprehensive treatment of soil pollution.更多还原