摘要
用农业工程客土的方法对菜区重金属污染的土壤进行改良,试验结果表明,客土来源不同可使青菜增产或减产一成左右。经客土处理,土壤表层重金属元素含量大大降低,同时可使青菜体内镉等重金属残留量平均下降50％—80％。其中客土10cm的处理,青菜镉残留量略超过国家食品卫生标准(镉0.05ppm);20cm客土的处理,镉残留量接近标准;30cm客土的处理,镉残留量低于标准。土壤重金属污染愈严重,改良效果愈明显。客土王程排出的污染土壤可用于制砖。
In an experiment carried out in Shanghai suburbs, agricultural engineering soil exchange method was used to improve soils polluted by heavy metal. Statistical analysis of experimental result data showed that the pakchoi yield could increase or decrease by 10% depending on the characteristics of replacer soils used. After the use of replacer soil, the contents of some heavy metals in surface soil dropped greatly. Meanwhile, the contents of heavy metals such as Cd etc. in pakchoi decreased by 50% to 80%. When the depth of replacer soil applied was 10cm, Cd content in pakchoi slightly exceeded the National Food Health Standard(Cd 0.05ppm). Cd content was near the standard when the depth of replacer soil applied was 20cm and Cd content was lower than the standard in the case of 30cm depth. The more seriously the original soil was polluted, the better the effect would be. The polluted soil removed could be used to make brick.
出处
《上海农业学报》
CSCD
1990年第3期50-55,共6页
Acta Agriculturae Shanghai
关键词
客土改良
蔬菜
重金属
污染
土壤
Agricultural engineering, Soil improvement by soil exchange, Heavy metal, Polluted soil, Vegetable growing area
