摘要
通过清洁黑土和污染黑土的形态分级分析和黑土铅对乙草胺的响应实验 ,对东北黑土铅形态及其乙草胺使用的生物有效性响应进行了研究 .结果表明 ,清洁和污染黑土中的铅均主要以有机质 硫化物结合态铅和残渣态铅这 2种生物有效性低的形态为主 ,而水溶态铅和可交换态铅这 2种具生物学活性的铅含量则相对较低 .与清洁黑土相比 ,污染黑土中具生物学活性的铅含量所占总铅含量的比例有所上升 .随着农业活动中施入高剂量的乙草胺这一除草剂 ,黑土中具生物学活性的水溶态和可交换态铅的含量则大幅上升 .据分析 ,其原因是铅在与乙草胺交互作用过程中来自有机质 硫化物结合态铅释放对有效态铅的贡献 .
By using Pb-fractionation analytical methods and Pb-acetochlor response experiments,it was studied the Pb forms in clean and polluted phaiozems of northeast China and the response of Pb bioavailability to acetochlor application.The results showed that the dominant Pb forms in these soils were low bio-available organic-sulfide Pb and residual Pb,and the concentrations of high bio-available water-soluble and exchangeable Pb were relatively low.However,the ratio of bio-available Pb to total Pb was lower in polluted phaiozem than in clean phaiozem.The bioavailability of Pb in the soil was obviously increased after high dose of acetochlor was applied.The main reason was the contribution of organic-sulfide Pb to bio-available Pb interacted with acetochlor.
出处
《应用生态学报》
CAS
CSCD
2004年第10期1883-1886,共4页
Chinese Journal of Applied Ecology
基金
国家杰出青年科学基金项目 ( 2 0 2 2 5 72 2 )
国家自然科学基金重点资助项目 ( 2 0 3 3 70 10 )
关键词
黑土
铅
生物有效性
乙草胺
污染土壤
Phaiozem, Pb, Bioavailability, Acetochlor, Contaminated soil.
