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Heavy metal contamination in soil-rice system and its spatial variation in Shengzhou City |
GAO Zhi-qun1, ZHANG Mei-jian1, ZHAO Ke-li1, FU Wei-jun1, GAO Wei2 |
1. School of Environmental and Resource Sciences, Zhejiang A & F University, Lin'an 311300, China;
2. Jiuzhaigou National Park administration, Aba Autonomous Prefecture, Sichuan Province, Aba 623400, China |
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Abstract There was a total of 94 pairs of soil and rice samples were collected from Shengzhou, Zhejiang Province. The results indicated that the mean soil concentrations of five heavy metals including Cd, Cu, Ni, Pb and Zn were 0.20, 28.64, 27.03, 38.51 and 98.74mg/kg, respectively. Compared with the National Guidelines, the heavy metals were enriched in paddy soils of the study area. Part of paddy farmland was seriously contaminated by heavy metals in Shengzhou city. However, the heavy metals in rice still remained at a safe level. The Cd, Cu, Ni, Pb, Zn concentrations in paddy soil had a moderate variability coefficients of 45.00%, 46.65%, 81.54%, 18.07%, 32.47%, respectively. Kriging interpolation and the Local Moran's I were used to identify the contaminated hotspots of these five metals. It was found out that the soil Cd, Cu, Ni, Zn had a very similar spatial pattern-higher concentrations located in the middle part of the study area while relatively lower levels in the eastern and western regions, which could be attributed to industrialization and other anthropogenic activities. The accumulation and bioavailability of heavy metals in the soil-rice system may be influenced by both soil heavy metal concentrations and soil physico-chemical properties. It may pose a potential threat to local ecosystem and human health as a long-term effect.
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Received: 27 May 2015
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