广东省土壤铜环境背景值空间变异研究

Spatial Distribution and Vertical Variation of Soil Cu Environmental Background Value in Guangdong

在GIS支持下,结合地统计学软件Surfer对广东省261个土壤剖面的铜环境背景值进行空间变异分析,结果表明:背景浓度高的土壤样品通常位于断裂带、盆地和三角洲地区,并与区域盆地的空间分布对应;铜背景值从A层到C层呈明显的增长趋势,但没有底层富集现象;区域广泛分布的花岗岩和断裂构造的分布是土壤铜元素附存和分布状态的主要影响因素,土壤有机质和粘粒含量也在一定程度上影响着土壤铜元素浓度的空间展布。

Based on GIS with Geo-statistics analyst software （Surfer 8.0）, total of 261 soil depth profiles were reported to investigate the Cu spatial distribution and vertical variation in Guangdong province. Cu spatial distribution presented similar patterns and high Cu concentration mainly was located in fault, basin, and delta areas, indicating that soil Cu distribution was dependent on regional basin. Moreover, from A- to C-horizon Cu mean concentrations had an increasing tendency. Regional extensive distribution of granite and the fault mainly decided the spatial distribution of Cu concentration. Soil organic matter and clay content also, to a certain extent, affected the spatial distribution of Cu concentration.