Pedosphere 19(6): 779--789, 2009
ISSN 1002-0160/CN 32-1315/P
©2009 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Salinity and persistent toxic substances in soils from Shanghai, China |
SHI Gui-Tao1,2, CHEN Zhen-Lou1 , XU Shi-Yuan1, YAO Chun-Xia1, BI Chun-Juan1 and WANG Li1 |
1 Key Laboratory of Geographic Information Science of Ministry of Education, East China Normal University, Shanghai 200062 (China)
2 Polar Research Institute of China, Shanghai 200136 (China) |
| ABSTRACT |
| Some farmland soils in Shanghai had high salinity levels, suggesting secondary salinization of the soils. The soil problems in Shanghai were studied, including the salinity and nitrate nitrogen (NO3--N) concentrations, heavy metal pollution characteristics, and organochlorine pesticide (OCP) residual levels and polycyclic aromatic hydrocarbon (PAH) contents. Accumulation of NO3--N in vegetable soils was the most significant among different functional soils. Heavy metal pollution was significant in the samples collected from the sewage-irrigated land and roadside. The identification of the metal sources through multivariate statistical analysis indicated that Pb, Zn, Cu and Cr in urban soils were from the traffic pollutants; excessive application of fertilizer and irrigation were the main reasons for the metal pollution in agricultural soils; Ni in the observed soils was controlled by parent soils. OCPs could still be detected in farmland soils but degraded greatly in last 20 years after prohibition of their usage. PAHs with 2-3 rings were the main components in industrial soils. The concentrated PAHs in the investigated soils were likely from petroleum and coal combustion. |
| Key Words: heavy metal, OCP, PAH, salinity, soil environment |
| Citation: Shi, G. T., Chen, Z. L., Xu, S. Y., Yao, C. X., Bi, C. J. and Wang, L. 2009. Salinity and persistent toxic substances in soils from Shanghai, China. Pedosphere. 19(6): 779-789. |
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