农业环境科学学报2012，Vol.31Issue(5)：904-912,9.
土壤-甘蔗作物系统中镉的生物有效性研究
Cadmium Bioavailability in Soil-sugarcane System
摘要
Abstract
The relationships between cadmium( Cd) bioavailability in soils and Cd concentrations in the roots, leaves and unpolished stalks of sugarcane were studied based on field investigation and the ICP-MS technique. Sugarcane samples and rhizosphere soils around them at 18 sites in Guangxi Province of China were collected and the concentrations of Cd were determined on acetic acid(HAc), ethylenediaminete-traacetic acid disodium sall(EDTA-2Na), magnesium chloride hexahydrate (MgCl2) extractions, and by diffusive gradients in thin films (DGT). Although simple linear regression analyses between concentrations of Cd in plants and those in soils measured using DGT and chemical extractions showed very good fits in both roots and unpolished stalks, the correlation coefficients of those obtained by DGT were higher than those based on chemical extractions. Multivariate analyses were used to assess the impact of pH, cation exchanged capacity(CEC), soil organic matter( OM%) and texture, two principal components were extracted and the linear regression models were established. These results indicated that the multiple linear regression of the DGT measurement quantitatively incorporates the main factors affecting the bioavailability of Cd in soils, predictions of the DGT model were hardly affected by the physical and chemical properties of soils chosen in this paper. The bioavailability of Cd in soils could be predicted more accurately by DGT than chemical extractions.关键词
镉(Cd)/生物有效性/梯度扩散薄膜技术(DGT)/甘蔗/广西Key words
cadmium(Cd)/ bioavailability/ diffusive gradients in thin films(DGT)/ sugarcane/ Guangxi分类
资源环境引用本文复制引用
王芳丽,宋宁宁,王瑞刚,唐世荣..土壤-甘蔗作物系统中镉的生物有效性研究[J].农业环境科学学报,2012,31(5):904-912,9.基金项目
农业部"948"项目(2010-Z12) （2010-Z12）
