应用生态学报2009，Vol.20Issue(7)：1705-1710,6.
钙对土壤镉有效性的影响及其机理
Effects of calcium on cadmium bioavailability in lateritic red soil and related mechanisms
摘要
Abstract
A pot experiment with Cd-polluted lateritic red soils was conducted to study the effects of applying different concentration (0, 40, 100, and 200 mg·kg-1) Ca on the rape biomass, its Cd uptake, and the Ca and Cd concentrations in soil solution. Comparing with no Ca application, applying Ca increased the rape dry mass, whether under high or low level Cd pollution. The increment of the dry mass in two cropping seasons was averagely 5.5% (low level Cd pollution) and 17.3% (high level Cd pollution). The Ca concentration both in soil solution and in rape plant increased markedly with increasing Ca application rate. At the Ca application rate 100 mg·kg-1, the Cd concentration in soil solution increased by 74.5% (low Cd pollution) and 31.0% (high level Cd pollution), while that in rape plant decreased by 4.5% (low Cd pollution) and 13.1% (high level Cd pollution). There was a positive relationship between the Ca/Cd (mass ratio) in soil solution and the Cd concentration in rape plant under both low and high levels Cd pollution. The Ca/Cd (mass ratio) in soil solution affected the bioavailability of soil Cd, and further, affected the Cd uptake by rape.关键词
镉/钙/小油菜/赤红壤/有效性Key words
Cd/ Ca/ rape/ lateritic red soil/ bioavailability.分类
资源环境引用本文复制引用
宋正国,徐明岗,李菊梅,居学海,唐世荣..钙对土壤镉有效性的影响及其机理[J].应用生态学报,2009,20(7):1705-1710,6.基金项目
国家重点基础研究发展规划项目(2002CB410809)和北京市自然科学基金项目(6062026)资助. （2002CB410809）
