7个柳树无性系在Cu/Zn污染土壤中的生长及对Cu/Zn的吸收

通过盆栽试验来评价7个柳树无性系(旱柳?杞柳和金丝柳)修复Cu/Zn污染土壤或矿砂的潜力.研究了7个无性系在2种污染介质中的生长,叶绿素含量?根系形态及其对Cu、Zn的吸收转移.结果表明,150d后,7个柳树无性系在污染介质中都能生长,其中旱柳和金丝柳生长较好,其他无性系生长受到明显抑制.各无性系叶片出现黄化现象,叶绿素相对含量降低.根系发育受到一定程度的抑制.各无性系对Cu的积累主要在地下部,而对Zn的积累主要在地上部,特别是在叶片中.7个无性系在铜土中更容易积累重金属.各无性系生物富集系数(BCF)Cu.Cu的转移系数(TF)值均<1,Zn的TF值在1.36~2.49之间.旱10?旱34和金丝柳对Cu和Zn有较强的耐性和一定积累能力,适合在尾矿区造林和修复.

Plant growth and metal uptake by Seven Salix clones on Cu/Zn contaminated environment

A greenhouse pot experiment was conducted to evaluate the potential of Salix clones for revegetation in copper/zinc (Cu/Zn) mine tailing areas. Seven Salix clones (Salix matsudana, Salix integra and Salix alba var.tristis) were tested to assess their growth, chlorophyll contents, root morphology, metal accumulation and translocation in plants. All clones can grow in contaminated soil or tailing and showed a certain tolerance to Zn and Cu. Salix matsudana Number 10, Number 34 and Salix alba var.tristis maintained normal growth while the other four clones were significantly inhibited in growth. Heavy metals decreased chlorophyll of all clones, and some leaves had etiolation symptom. The root parameters of all clones grown in contaminated soil and tailings were decreased. The metal contents in the plants varied among clones and contaminated environmental. All clones on contaminated soil uptake metals much more than tailings. The accumulation of Cu was mainly occurred in root while Zn was mainly accumulated by shoots, especially by leaves. All clones have low bioconcentration factor (BCF) and the values were Zn > Cu. Translocation factor values (TF) of Cu were <1, but the TF values of Zn between 1.36 to 2.49. Salix matsudana Number 10, Number 34 and Salix alba var.tristis may have potential for revegetation and phytostabilization in mine tailing areas in southern China.