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对扬州市域内306413 hm 2耕地土壤进行采样监测,Cd、H g、As、Cr、Cu、Pb 6种重金属采用《绿色食品产地环境技术条件》(NY/T391-2000),Zn、Ni和666、DDT采用《土壤环境质量标准》(GB15618-1995)水田二级标准,对扬州市耕地土壤环境质量现状进行了评价,在此基础上,对扬州市土壤近20年重金属含量动态变化及累积情况进行了分析。研究结果表明,在扬州市耕地土壤中,90.9%的样点土壤处于清洁水平,8.3%的样点土壤处于尚清洁水平,近20年内土壤重金属含量变化不大,无明显累积现象,扬州市耕地土壤未受到重金属和有机氯农药的明显污染,土壤环境质量满足国家大型优质稻米生产基地的产地条件。
The sampling and monitoring of 306413 hm2 of arable land in Yangzhou were carried out. The contents of Cd, Hg, As, Cr, Cu and Pb in heavy metals were measured by the method of “Environmental Technical Conditions of Green Food Producing Area” (NY / T391-2000) , DDT evaluated the status of soil environmental quality of cultivated land in Yangzhou by using the second grade standard of “Soil Environmental Quality Standard” (GB15618-1995), on the basis of which, the dynamic changes and accumulation of heavy metals in the soil of Yangzhou City in recent 20 years Analyzed. The results showed that 90.9% of the sample soil in the cultivated soils of Yangzhou was at a clean level, 8.3% of the sample spots were at a clean level and the content of heavy metals in the soil did not change much in the past 20 years, The soil is not obviously polluted by heavy metals and organochlorine pesticides, and the environmental quality of the soil meets the producing conditions of the large-scale high-quality rice production base in the country.