应用生态学报2012，Vol.23Issue(10)：2701-2707,7.
施用污泥对土壤重金属形态分布和生物有效性的影响
Effects of applying sewage sludge on chemical form distribution and bioavailability of heavy metals in soil
摘要
Abstract
A pot experiment was conducted to study the effects of applying sewage sludge on the chemical form distribution of heavy metals ( Cd, Pb, Cu and Zn) in soil and the transfer and accumulation of the heavy metals in soil-plant ( ryegrass) system. With the application of sewage sludge, the contents of bioavailable Cd and Zn in soil increased significantly but that of bioavailable Pb in soil had a significant decrease, and the content of residual form Pb in soil increased by 33. 3%-74. 5% , compared with CK. When the application rate of sewage sludge was 50% (M/M) of soil, the contents of exchangeable and reducible Cu in soil only occupied 0. 7% and 0. 2% of the total Cu respectively. The application of sewage sludge promoted the Cd, Cu and Zn absorption while inhibited the Pb absorption by ryegrass. Multiple linear regression analysis showed that the Cd, Zn and Cu contents in ryegrass were positively correlated with the reducible Cd and Zn and oxidizable Cu contents in soil, respectively, and Pb content in ryegrass was highly correlated with the soil exchangeable and oxidizable Pb contents. After planting ryegrass, the oxidizable Cd and Cu in rhizosphere soil were transformed into exchangeable Cd and residual form Cu, respectively , the exchangeable and reducible Zn transformed into oxidizable Zn, whereas the bioavailability of Pb was less affected.关键词
城市污泥/重金属形态/黑麦草/生物有效性Key words
sewage sludge/ heavy metal form/ ryegrass/ bioavailability分类
资源环境引用本文复制引用
宋琳琳,铁梅,张朝红,惠秀娟,景逵,陈忠林,张莹..施用污泥对土壤重金属形态分布和生物有效性的影响[J].应用生态学报,2012,23(10):2701-2707,7.基金项目
辽宁省科技厅项目(20102086)和辽宁大学"211"工程重点学科项目(HJ211010)资助. （20102086）
