摘要
利用植物生长室水培试验和温室土培盆栽试验的方法,研究了朝天委陵菜在不同浓度Pb水培条件下和Cu、Zn、Pb、Cd复合污染土壤条件下的重金属耐性和吸收性,结果表明,水培条件下随着处理浓度的增加,朝天委陵菜均生长良好,虽高浓度Pb处理下出现植株矮小、叶渐黄、根系变黑等毒害症状,但植株并未死亡,表明在水培条件下朝天委陵菜对Pb具有极强的耐性;在最高浓度3 600μmol/L Pb处理下地上部和根中Pb浓度达到最大值,分别为947 mg/kg和71 053 mg/kg。在温室土培盆栽条件下,朝天委陵菜在外加Cu、Zn、Pb和Cd分别为200、1 000、1 000和5 mg/kg的土壤上较对照生长受到抑制,地上部Cu、Zn、Pb和Cd浓度分别达到741±164、18 248±2 222、1 543±483和29.4±5.2 mg/kg;外加重金属更高时则导致植株死亡。朝天委陵菜对Pb胁迫和Cu、Zn、Pb、Cd复合污染土壤具有较强的耐受性,可作为重金属尤其是Pb污染土壤的修复植物。
Growth chamber hydroponics and glass house pot experiment were conducted to study the tolerance and uptake of Pb in hydroponics condition and of Cu, Pb, Zn and Cd under mixed heavy metal contaminated conditions by Potenalla supina from a Cu mine area, the results showed that Potentilla supina could grow normally with the increase of Ph concentration in hydroponics solution, toxic symptom such as slow plant growth with yellow leaves and black roots at the treatment of high Pb concentration, but plant did not die, Potentilla supina had strong tolerance to Pb at hydroponics culture. Pb concentrations reached to the maximum of 947 mg/kg and 71 053 mg/kg in shoot and root at the highest concentration of solution Pb 3 600 mol/L. In pot experiment, plant grew well in the treatment of control, but grew slowly at the mixed metal pollution soils, Cu, Zn, Pb and Cd in the shoot were 741 ± 164, 18 248 ±2 222, 1 543 ± 483 and 29.4 ± 5.2 mg/kg respectively at the treatment of Cu 200 mg/kg, Zn 1 000 mg/kg, Pb 1 000 mg/kg and Cd 5 mg/kg, but plant died at the treatment with very high metal pollution level. These results showed that Potentilla supina has strong tolerant to Pb and Cd, Zn, Cu co-contamination, and can be used to remediate heavy metal polluted soil.
出处
《土壤》
CAS
CSCD
北大核心
2011年第3期476-480,共5页
Soils
基金
中国科学院知识创新工程重要方向项目(KSCX2-YW-G-053)
国家高技术研究发展计划项目(2006AA10Z406)资助
关键词
朝天委陵菜
重金属
生物量
吸收性
Potentilla supine, Heavy metals, Biomass, Uptake
