生态与农村环境学报2011，Vol.27Issue(1)：1-5,5.
六叉河小流域多水塘沉积物中镉含量历史变化趋势分析
Historical Variation of Cd Contents in Sediments of Ponds in Liuchahe Watershed
摘要
Abstract
Sediments collected from a number of ponds in Liuchahe watershed in Yangtze-Huaihe region of China were analyzed with chronological method to set up chronosequence of the undisturbed sediments for the purpose of study g historical process of Cd accumulation and its environmental impact. Results show that the rapid development of intensive agriculture in the past 30 years in the region led to application of large volumes of phosphate fertilizers, which resulted in Cd accumulation in the pond sediments in large volumes. The tempo-spatial distribution characteristics of Cd reversed by using pond sediments may divide Cd input history into two phases: the first phase refers to the decades before the 1980s, when the watershed was not or just slightly polluted with Cd; and the second phase, the decades after the 1980s, when the rapid intensification of fanning activities has led to rapid accumulation of Cd in pond sediments and Cd input through human activities is on an increasing trend. The Cd risk assessment of the sediments indicates that about 10％ - 30％ of total Cd is exchangeable Cd or carbonate-bonded Cd. The Cd in the sediments of these ponds is subject to a moderate level of exposure risk.关键词
沉积物/镉/风险/巢湖Key words
sediment/Cadmium/ risk/ Chaohu Lake分类
资源环境引用本文复制引用
张洪,单保庆..六叉河小流域多水塘沉积物中镉含量历史变化趋势分析[J].生态与农村环境学报,2011,27(1):1-5,5.基金项目
国家自然科学基金青年基金(20907067) （20907067）
中国科学院生态环境研究中心环境水质学国家重点实验室专项经费(09Y03ESPCR) （09Y03ESPCR）
