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
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.
高智群, 张美剑, 赵科理, 傅伟军, 高伟. 土壤-水稻系统重金属空间异质性研究——以浙江省嵊州市为例[J]. 中国环境科学, 2016, 36(1): 215-224.
GAO Zhi-qun, ZHANG Mei-jian, ZHAO Ke-li, FU Wei-jun, GAO Wei. Heavy metal contamination in soil-rice system and its spatial variation in Shengzhou City. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(1): 215-224.
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