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对金华市郊土壤 -杂草中 Cd、Cr、Cu、Mn、Pb和 Zn6种重金属元素含量测定和统计表明 :(1 )杂草不同器官内 6种重金属元素的平均含量由高到低分别为根 >叶 >茎 >花果 ,元素在植物体内的含量由高到低分别为 Zn>Mn>Pb>Cu>Cr>Cd,富集系数由大到小分别为 Cd>pb>Zn>Mn>Cu>Cr;(2 )空心莲子草 (Alternanthera philoxeroides)、光风轮(Clinopodium confinis)、水苦荬 (Veronica undulata)、石龙芮 (Ranunculusjaponicus)、水蓼 (Polygonum hydropiper)和水芹(Onanthe ajvanica)等能够耐较强的重金属污染 ,其中空心莲子草根、茎、叶中 Zn的含量可高达 1 699.2 8mg/kg、1 1 0 8.77mg/kg和 75 3 .0 8mg/kg,根中 Mn含量达 1 2 68.48mg/kg,水蓼叶中 Mn的含量可达 1 61 6.71 mg/kg;(3 )在重金属严重污染的环境中生长的杂草 ,不仅体内重金属含量上升 ,而且对重金属的富集系数也增高。
The contents and contents of six heavy metal elements (Cd, Cr, Cu, Mn, Pb and Zn) in soils and weeds in the suburb of Jinhua were measured. The results showed that: (1) The average content of six heavy metals in different organs of weeds was > Leaf> stem> flower and fruit, the contents of elements in plants were Zn> Mn> Pb> Cu> Cr> Cd, and the enrichment coefficients were Cd> Pb> Zn> Mn> Cu > Cr; (2) Alternanthera philoxeroides, Clinopodium confinis, Veronica undulata, Ranunculus japonicus, Polygonum hydropiper and Onanthe ajvanica The content of Zn in roots, stems and leaves of Alternanthera philoxeroides could reach as high as 1 699.2 8mg / kg, 110.77mg / kg and 75.30.8mg / kg, respectively. 1 2 68.48mg / kg. The content of Mn in the leaves of Polygonum hydropiper L. was up to1 61 6.71 mg / kg. (3) The weeds grown in the environment heavily polluted by heavy metals not only increased the content of heavy metals but also enriched the heavy metals The coefficient is also higher.