农业环境科学学报2009，Vol.28Issue(11)：2333-2337,5.
淹水还原作用对红壤镉生物有效性的影响
Effect of Submergence on the Bioavailability of Cd in a Red Soil
摘要
Abstract
Bioavailability of Cd may be strongly affected by the redox processes in soils after submergence. In this study a red soil (pH 4.46) was spiked with 20 mg·kg~(-1) Cd and was incubated under submerged condition for 41 days. At the same lime, rice seedlings were cultured during the initial (1th～11th day) and later periods (31th～41th day) after the soil was flooded in order to study the effect of soil redox processes on the Cd bioavailability. Results showed that the dissolved Cd concentration increased from 0.210 to 0.254 mg·L~(-1) until the 25th day after submergence, and then decreased from 0.221 to 0.092 mg·L~(-1). Cadmium content in rice shoot harvested at the 11th day and 41th day of incubation were 48.37 and 16.25 mg·kg~(-1), respectively. These results indicated that Cd activity and bioavailability at the beginning of submergence were higher than the later period. Through the research on the solubility of Fe and Cd, CEC and saturation of exchangeable cations of the soil, it was found that the decrease of pe+pH and the increase of pH were caused by the reductive dissolution of iron oxides, which controlled the variations of the activity and bioavailability of Cd in the red soil.关键词
红壤/水稻/Cd/还原作用/pe+pH/pHKey words
red soil/ rice/ Cd/ reduction/ pe+pH/ pH分类
资源环境引用本文复制引用
陈莉娜,葛滢,张春华,周权锁..淹水还原作用对红壤镉生物有效性的影响[J].农业环境科学学报,2009,28(11):2333-2337,5.基金项目
国家自然科学基金(30700479) （30700479）
中国科学院南京土壤研究所土壤与农为持续发展国家重点实验室开放基金项目(0751010005) （0751010005）
