生态与农村环境学报2018，Vol.34Issue(3)：201-206,6.DOI:10.11934/j.issn.1673-4831.2018.03.002
苏南区域农田土壤和大气颗粒中镉和铅含量及对水稻的贡献研究
Study on Cadmium and Lead Concentrations in Soils and Atmospheric Particles and Their Contributions to Rice in the Typical Agricultural Area of Southern Jiangsu Province
摘要
Abstract
In order to explore the concentrations of cadmium(Cd)and lead(Pb)in soils and atmospheric particles and their contributions to rice,rice samples grown in farmlands and the corresponding soils,atmospheric particles were collect-ed,in some typical agricultural areas of southern Jiangsu Province(Suzhou-Wuxi-Changzhou areas). The heavy metal concentrations of samples were determined and analyzed,especially for Cd and Pb. The results showed that the concentra-tion of Cd in soil was much higher than that of the background in Jiangsu soil. The concentration of lead in the dustfall was 382 μg·g-1. The enrichment coefficients of Cd in rice roots ranged from 0.62 to 3.20, with an average value of 1.91, which indicate that rice root can absorb Cd significantly. The enrichment coefficients of Pb in rice roots varied between 0.02 and 0.06,with an average value of 0.04. Based on the studied data, the average contribution rate of atmospheric particle to Pb concentration in rice grain was 32.7%,while the average contribution rate of atmospheric particle to Cd con-centration in rice grain was 15.4%. The results show that Cd in the rice grain is mainly from the contribution of the soil, and rice accumulates Cd by transferring Cd in rice root into grain. The Cd from atmospheric deposition accounts for a small portion of grain Cd.On the contrary,the mobility in soil and the transfer of Pb in rice are weaker than those of Cd,and the Pb concentration in rice grain mainly comes from the contribution of atmospheric particle. Therefore,the different charac-ters and sources of heavy metal will affect the absorption and accumulation of heavy metals in rice. In addition, different farmland environment and atmospheric pollution will affect the Cd and Pb contribution rates of soil and atmospheric particle to rice. Therefore,specific measures should be taken to control pollution sources and adjust the planting structure in ac-cordance with the farmland environment.关键词
重金属/大气沉降/贡献率/土壤-水稻系统/苏南地区Key words
heavy metal/atmospheric particle/contribution rate/soil-rice system/southern Jiangsu Province分类
资源环境引用本文复制引用
徐兰,周敏,袁旭音,汪宜敏,唐豆豆,张晓辉..苏南区域农田土壤和大气颗粒中镉和铅含量及对水稻的贡献研究[J].生态与农村环境学报,2018,34(3):201-206,6.基金项目
国家重点研发计划专项(2017YFD0800302) （2017YFD0800302）
国家自然科学基金(41372354,41601540) （41372354,41601540）
江苏省自然科学基金(BK20160859) （BK20160859）
中国地质调查局工作项目(201111021) （201111021）
