Assessment and mapping of environmental quality in agricultural soils of Zhejiang Province, China. J Environ Sci China

Institute ofAgricultural Remote Sensing and Information System, Zhejiang University, Hangzhou 310029, China.
Journal of Environmental Sciences (Impact Factor: 2). 02/2007; 19(1):50-4. DOI: 10.1016/S1001-0742(07)60008-4
Source: PubMed


Heavy metal concentrations in agricultural soils of Zhejiang Province were monitored to indicate the status of heavy metal contamination and assess environmental quality of agricultural soils. A total of 908 soil samples were collected from 38 counties in Zhejiang Province and eight heavy metal (Cd, Cr, Pb, Hg, Cu, Zn, Ni and As) concentrations had been evaluated in agricultural soil. It was found 775 samples were unpolluted and 133 samples were slightly polluted and more respectively, that is approximately 14.65% agricultural soil samples had the heavy metal concentration above the threshold level in this province by means of Nemerow's synthetical pollution index method according to the second grade of Standards for Soil Environmental Quality of China (GB15618-1995). Contamination of Cd was the highest, followed by Ni, As and Zn were lower correspondingly. Moreover, Inverse Distance Weighted (IDW) interpolation method was used to make an assessment map of soil environmental quality based on the Nemerow's pollution index and the soil environmental quality was categorized into five grades. Moreover, ten indices were calculated as input parameters for principal component analysis (PCA) and the principal components (PCs) were created to compare environmental quality of different soils and regions. The results revealed that environmental quality of tea soils was better than that of paddy soils, vegetable soils and fruit soils. This study indicated that GIS combined with multivariate statistical approaches proved to be effective and powerful tool in the mapping of soil contamination distribution and the assessment of soil environmental quality on provincial scale, which is beneficial to environmental protection and management decision-making by local government.

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Available from: Zhou Shi, Feb 14, 2015
    • "The levels of HM contamination were expressed by the Nemerow composite index (P S ) (Cheng et al., 2007) using as reference evaluation criteria the recommended limit values by the Bulgarian Ministry of the Environment and Water (MoEW 2008). The levels of soil contamination were classified into five grade scales referring to the value of P S : P S <0.7—safety soil, 0.7≤P S <1.0—precaution soil, 1.0≤ P S <2.0—slightly contaminated soil, 2.0≤P S <3.0—mod- erately contaminated soil, and P S >3—seriously contaminated soil (Cheng et al. 2007). "
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    • "Single-factor pollution index (PI) was calculated as the ratio between the amount of metals in each soil and its control value (uncultivated soil). Nemerow pollution index (PIN) or comprehensive PI was evaluated for Mn, Cu, Zn, and Cd by the following relation [24]: "
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    • "GIS-based predictive modeling of heavy metal concentrations Following the approach of previous studies (for example, Liu et al. 2006; Wang and Qin 2006; Cheng et al. 2007; Zhang et al. 2008; Hani and Pazira 2011), a geographical information system (GIS) was utilized for modeling the spatial concentrations of heavy metals in the study area. "
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