摘要
在野外调查取样和室内分析获得大量土壤重金属含量数据和空间数据的基础上,利用经典统计学和普通克里格法(OK)对采样区域土壤重金属含量的空间变异性进行了分析,并利用指示克里格法(IK)和多变量指示克里格法(MVIK)绘制了各项重金属元素污染风险和土壤污染综合风险概率图。结果表明:岩溶地貌区土壤重金属As、Cd、Cr、Cu、Pb、Hg、Ni和Zn的含量显著高于非岩溶地貌区,各项重金属元素之间具有显著的相关性,说明它们存在很大的同源性和复合关系;受岩性、成土母质等内在因素的影响,各项重金属元素(除Cu元素外)都具有强烈的空间变异性,重金属元素含量高值主要分布在东南部和北部的岩溶地貌区,低值主要分布在西南部的非岩溶地貌区;采样区域存在As、Cd、Cu、Hg、Ni和Zn等重金属污染风险,其风险概率分别为0.326、0.805、0.185、0.192、0.267和0.270,土壤重金属污染综合风险概率为0.335。
A large number of soil heavy metal content data and spatial data were obtained through soil survey and laboratory analysis. Spatial variability of soil heavy metals were analyzed by ordinary Kriging( OK) and classical statistical analysis. The pollution risks of each soil heavy metals were studied by utilizing indicator Kriging( IK) and the integrated risk of soil pollution was calculated by multiple variable indicator Kriging( MVIK). Results showed that the contents of heavy metals of As,Cd,Cr,Cu,Pb,Hg,Ni and Zn in karst area were obviously higher than those in non-karst area. They were significantly correlated with each other( P〈0. 01),meaning that they were of the same source. The value of correlation coefficient between Zn and Cd was the highest,and the value of correlation coefficient between As and Cd was the lowest. All the soil heavy metals had significant correlations with pH values( P〈0. 01). All the heavy metals had strong spatial variability with exception of Cu,due to the intrinsic factors,including the lithology and soil forming rock. The high values of heavy metals were in the southeast and north of the survey area,and the low values were in the southwest area. There were pollution risks for As,Cd,Cr,Cu,Pb,Hg,Ni and Zn,and the risk probabilities of them were 0. 326,0. 805,0. 185,0. 192,0. 267 and 0. 270,respectively. Therefore,there was high pollution risk for Cd.The probability for integrated risk of soil heavy metals pollution was 0. 335. The study provided scientific consults for the industrial and agricultural production and the environment management.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2017年第12期248-254,共7页
Transactions of the Chinese Society for Agricultural Machinery
基金
中国地质大调查项目(DD20160324)
广西科学研究与技术开发计划项目(桂科攻1598016-11)
中国地质科学院基本科研业务费专项(YYWF201508)
广西自然科学基金项目(2014GXNSFAA118280)
关键词
土壤重金属
污染风险
克里格
指示克里格
空间分布
soil heavy metal
pollution risk
Kriging
indicator Kriging
spatial distribution