长期温室菜地土壤重金属累积状况及污染评价
Soil heavy metal accumulation and risk assessment in a long-term vegetable-growing greenhouse
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摘要: 为研究温室菜地种植对土壤重金属含量的影响,以中国农业大学曲周实验站长期定位试验土壤为研究对象,分析了土壤重金属含量累积变化特征并对其进行了污染评价.结果表明,与河北省重金属土壤背景值相比,0—40 cm土壤重金属Cd、Cr、Cu、Zn、Pb的含量均有不同程度的累积,其中Cd和Cu累积程度最高;除As和Ni外,0—20 cm土壤重金属Cd、Cr、Cu、Zn、Pb的含量均有随种植年限的增长而增加的趋势;0—20 cm土壤Cd、Cu、Zn含量均分别显著高于20—40 cm土壤Cd、Cu、Zn含量(PP<0.05).根据《土壤环境质量标准》(GB15618—1995)二级标准限值评价,2016年曲周实验站温室菜地0—20 cm土壤重金属环境质量处于轻污染状态,其中重金属Cd是主要的污染因子.Abstract: In order to research the impact of greenhouse vegetable growing on soil heavy metal accumulation, we measured heavy metal concentrations, analyzed their variation characteristics, and evaluated their pollution status based on a long-term experiment which has been conducted in a vegetable-growing greenhouse located at the Quzhou Field Research Station in Hebei Province, China. The results showed that the contents of Cd、Cr、Cu、Zn and Pb accumulated in different degrees in 0-40 cm soil compared with the background values of soil heavy metals in Hebei Province, among which the accumulation rates of Cd and Cu were the highest. The contents of soil heavy metals Cd、Cr、Cu、Zn and Pb in 0-20 cm soil layer increased with the increasing of plantation years except As and Ni. We also found that the contents of Cd, Cu and Zn in 0-20 cm soil were significantly higher than those in 20-40 cm soil layer, but the content of As in 0-20 cm soil was significantly lower than that in 20-40 cm soil layer (PP<0.05). According to Environmental Quality Standards for soil (GB15618-1995), the soil environment quality of long-term greenhouse vegetable field in the Quzhou Field Research Station was lightly polluted by heavy metals in 2016, in which Cd is the main pollution factor.
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Key words:
- long-term vegetable-growing greenhouse /
- heavy metal /
- soil pollution /
- Cd
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