广东省土壤无机元素背景值的变化趋势研究

摘要

A retrospective investigation on the background values of some inorganic elements including As, Cd, Co, Cr, Cu, F, Hg, Mn, Ni, Pb, Se, V and Zn in soils of Guangdong Province, China was conducted to study their trend in the past several decades. In comparison with the results obtained from The Seventh Five-year Plan of China, background concentrations of all elements were increased, especially for Se, V, Zn and Co, with the exception of Hg and F in A horizon and F in C horizon which were decreased. In addition, with the increase of sampling depth (from A to C horizon), background concentrations of As, Co, Cr, F, Hg, Mn, Ni, V and Zn were increased, but the reverse trend was observed for Cd, Pb, and Cu. No change of Se concentration in background samples of Guangdong was observed. The reason for changes of background concentration of any elements that happened was analyzed.%通过对“七五”期间广东省土壤环境背景监测点回顾性调查,以研究广东省土壤背景监测点13种无机元素含量变化趋势.与“七五”背景值对比,土壤A层中Hg以及A、C两层中F含量下降,其他11种元素含量均上升,特别是Se、V、Zn和Co的含量有较明显的上升.As、Co、Cr、F、Hg、Mn、Ni、V和Zn的含量从A层到C层呈增加趋势,Cd、Pb和Cu的含量呈减少趋势,Se的含量基本没有变化,此外还对无机元素含量变化的原因进行分析.