Journal of Ecology and Rural Environment ›› 2018, Vol. 34 ›› Issue (3): 201-206.doi: 10.11934/j.issn.1673-4831.2018.03.002

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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

XU Lan, ZHOU Min, YUAN Xu-yin, WANG Yi-min, TANG Dou-dou, ZHANG Xiao-hui   

  1. College of Environment, Hohai University, Nanjing 210098, China
  • Received:2017-04-21 Online:2018-03-25 Published:2018-03-23


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 collected, 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 concentration 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 concentration 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 characters 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 accordance with the farmland environment.

Key words: heavy metal, atmospheric particle, contribution rate, soil-rice system, southern Jiangsu Province

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