基于Kriging插值的矿区周边土壤重金属空间分布规律研究

Study on Spatial Distribution of Soil Heavy Metals Surrounding the Mining Area Based on Kriging

土壤重金属污染已成为全球性污染问题,本文基于地统计学和GIS技术,研究了湖南省郴州市苏仙区As、Cd、Pb三种土壤重金属的空间分布规律。结论:(1)重金属含量Pb>As>Cd,Pb和As呈对数正态分布,Cd呈正态分布,As和Pb显著正相关。(2)重金属含量南北低、中间高,东西向上,自西向东平稳上升。(3)具有中等空间变异性和相似的各向异性。(4)空间格局类似,以主要矿区为浓度高值中心,向四周辐射递减。(5)空间自相关格局相似。高-高区域集中在中部,低-高分布在柿竹园周边。本文可为矿区周边土壤重金属空间规律的研究提供参考。

The soil heavy metal pollution has become the global pollution problem. Based on geostatistics and GIS technology, we studied the spatial distribution of three kinds of soil heavy metals in Suxian district, Chenzhou city, Hunan province. The results show that：（1）The heavy metal contents in descending order are：Pb〉As〉Cd, Pb and As showed a log-normal distribution, Cd showed a normal distribution, As and Pb are positively correlated.（2）The contents of heavy metal are low in the north and the south, high in the middle, and increased from the west to the east. （3）Heavy metals have moderate spatial variability and similar anisotropy.（4）Taking central polymetallic mine, northern lead-zinc mine and coal mine as the core, heavy metals concentration radially decreased to the periphery.（5）Spatial autocorrelation patterns are similar. The high-high areas are concentrated in the central region and the low-high areas are in the periphery of Shizhuyuan. This study can provide a reference for the research of heavy metals spatial distribution in mining area.