摘要
采用湿法消化法研究了浙江省不同地区农田污水灌溉后水体、土壤和多种农作物各器官的镉含量，分析了土壤污染状况及农作物对重金属镉的富集特征。结果表明：污水和受污土壤镉含量极显著相关（R^2=0．617，P〈0．01）。不同农作物对镉的吸收程度不同，富集系数为紫云英〉水稻〉大豆〉大麦〉玉米〉小麦。未受污染农作物和受污农作物根系及地上部镉含量差异明显，但镉富集系数差异不明显。同一农作物不同器官对镉的累积规律为根系〉茎叶〉果实。不同农作物果实的富集系数为紫云英〉大麦〉大豆〉水稻〉小麦〉玉米。对几种农作物富集系数和吸收系数的比较发现，玉米和小麦根系及茎叶等营养器官富集镉的能力较强，但果实富集量却很低。6种农作物对镉的转移系数为玉米〉大麦〉紫云英〉小麦〉大豆〉水稻，且转移系数介于0．50～0．95之间，说明这几种农作物均对镉有很好的耐性。
Cd content of sewage, soil, as well as roots, stems, leaves of different crops under sewage irrigation in a number of fields across Zhejiang Province were calculated using wet digestion method and Cd accumulation characteristics of different crops presented. The results show that Cd content of sewage is higher than that of polluted soils, with a positive and significant relationship （R^2 = 0. 617, P 〈 0.01 ） between sewage and polluted soil. Accumulation coefficients of different crops is in following order ： Astragalus sinicus 〉 Oryza sativa 〉 Glycine max 〉 Hordeum vulgare 〉 Zea mays 〉 Triticum aestivum. Crop Cd content in polluted and non-polluted soils is significantly different, while the difference in accumulation coefficient is insignificant. The order of accumulation coefficient for the different organs of tested crops is ： root 〉 stem and leaf 〉 fruit ; and that for fruits of different corps is： A. sinicus 〉 H. vulgare 〉 G. max 〉 O. sativa 〉 T. aestivum 〉 Z. mays. Comparison of accumulation and absorption coefficients among the crops indicates that nutrient organs, such as root, stem and leaf of Z. mays and T. aestivum have stronger Cd accumulation capacity, while fruits generally accumulate less Cd. The order of transfer coefficients of crops is： Z. mays 〉 H. vulgare 〉 A. sinicus 〉 T. aestivum 〉 G. max. 〉 O. sativa. Cd transfer coefficient of six crops is 0.50 - 0.95, showing that these crops are resistant to Cd.
出处
《中国生态农业学报》
CAS
CSCD
2008年第3期675-679,共5页
Chinese Journal of Eco-Agriculture
关键词
镉
农作物
生物富集
富集系数
转移系数
Cd, Crop, Bioaccumulation, Accumulation coefficient, Transfer coefficient
