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以上海市金山张堰地区的鱼塘废弃地为试验地,对鱼塘填埋土进行了重金属含量测定及潜在风险评价、土壤本底特征调查;并利用豆类秸秆还田措施进行复耕,分析不同年限下土壤养分的变化。结果表明:鱼塘填埋土各样点镉的含量低于最低检测值,其它重金属含量也均远低于《土壤环境质量标准》的二级限值和《农用污泥中污染物控制标准》,各样点的生态风险较小;土壤偏碱性,改良前土壤中有机质、全氮、速效氮、速效钾含量较低;经过两茬豆类植物的秸秆还田措施,0~30 cm土壤层结构得到改善,各类型土壤之间的差异减小,土壤速效磷、钾含量大幅增加。
Taking the wasteland of fish ponds in Zhangyan of Jinshan, Shanghai as test ground, the heavy metal content of landfill in fish ponds was determined and the potential risk assessment and soil background characteristics were investigated. Analysis of soil nutrient changes under different years. The results showed that the content of cadmium in every spot of fishpond landfill soil was lower than the lowest detection value, and the contents of other heavy metals were also far lower than the second-level limit of “soil environmental quality standard” and “the control standard of pollutants in agricultural sludge” , And the ecological risk was less in all sampling sites. The content of organic matter, total nitrogen, available nitrogen and available potassium in soils with low alkalinity and soil before improvement were lower than those in other areas. After two measures of returning straw to field, Layer structure is improved, the difference between various types of soil decreases, soil available phosphorus, potassium content increased significantly.