农业环境科学学报2013，Vol.32Issue(3)：498-502,5.DOI:10.11654/jaes.2013.03.014
模拟酸雨对空心菜-土壤系统中六价铬迁移转化的影响
Effects of Simulated Acid Rain on the Migration and Transformation of Hexavalent Chromium in a Water Spinach-soil System
摘要
Abstract
A pot experiment was conducted to study the effects of acid rain on the distribution, migration and transformation of hexavalent chromium in a water spinach(Ipomoea aquatica) soil system. Results showed that the amount of total chromium in water spinach treated with simulated acid rain was significantly higher than those without acid rain. The content of chromium in the underground part of water spinach was significantly higher than it in the aboveground part in treatments with simulated acid rain. While water spinach could survive and grow normally in soil with 100 mg·kg-1 chromium, they couldn't survive in soil with chromium up to 200 mg·kg-1. Valences of more than 97.0% added hexavalent chromium was changed. The majority portion of the chromium was remained in soil. Only very small portion was absorbed by water spinach. The simulated acid rain could significantly enhance the absorption rate of chromium by water spinach. The amount of absorbed chromium in treatments with acid rain was 2.6 to 5 times as those in the treatments without acid rain. The chromium enrichment coefficients were 2.2 and 4.6 for the aboveground part and the underground part of water spinach respectively by comparing the treatments with and without acid rain. The research result shows that acid rain increases the risk of crop grown in soil contaminated by chromium especially through the absorption of chromium by root system. Hence, agricultural food safety problem in chromium polluted area will be enhanced by acid rain.关键词
模拟酸雨/铬/空心菜/迁移转化Key words
simulated acid rain/ hexavalent chromium/ water spinach/ migration and transformation分类
资源环境引用本文复制引用
陈桂葵,李志鹏,陈恋,刘明中,黎华寿..模拟酸雨对空心菜-土壤系统中六价铬迁移转化的影响[J].农业环境科学学报,2013,32(3):498-502,5.基金项目
国家自然科学基金项目(30700099) （30700099）
863项目(2013AA102402) （2013AA102402）
