【摘要】 通过砂基培养,研究了朝天委陵菜(Potentilla supina)在不同浓度Cd2+、Cu2+、Pb2+、Zn2+胁迫下的生长特性及富集能力。结果表明,朝天委陵菜对Cu2+、Zn2+、Pb2+、Cd2+的耐受性较强,在≤130mg/L的胁迫下未出现死亡,仅随浓度增大而植株生长减慢;Cu2+的富集量及富集系数为50mg/L组最大,分别达1422.91mg/kg和28.46;Pb2+的富集量及富集系数为70mg/L组最大,分别达1148.92mg/kg和16.41;Zn2+的富集能力较弱,富集系数在1.48~6.33之间;Cd2+的富集量最少,各浓度组富集系数均小于0.1。在砂培条件下,朝天委陵菜对四种重金属的富集能力,各浓度组均为Cu2+>Pb2+>Zn2+>Cd2+;当Cu2+、Pb2+污染物浓度≤90mg/L时,朝天委陵菜对Pb2+和Cu2+的富集达到超富集植物的富集水平,可选作Cu2+、Pb2+污染土壤的修复植物;Cu2+、Pb2+污染土壤上生长的朝天委陵菜,因Cu2+、Pb2+含量超标不宜采食或药用。更多还原

【Abstract】 Using sand culture, the growth characters and accumulation capacity of Potentilla supina L. stressed by different concentrations of Cd2+,Cu2+,Pb2+ or Zn2+ were studied. The results showed that P. supina had a good tolerance to Cd2+,Cu2+,Pb2+ or Zn2+. It could grow even when the heavy metals were up to 130 mg/L, but grew slowly as the concentration raised. It was also found that P. supina had great capacity of accumulating Cu2+. When the concentration of Cu2+ was 50 mg/L, the accumulation and enrichment coefficient both reached to the maximum 1 422.91 mg/kg and 28.46, respectively. As for Pb2+, both the accumulating and enrichment coefficient reached to the maximum as the concentration was 70 mg/L. But the accumulating Zn2+capacity of Potentilla supina L. was lower, the enrichment coefficients were between 1.48 and 6.33. The quantity of enriching Cd2+ was the least, and all the enrichment coefficients were below 0.1. Using sand culture, the abilities that P. supina enriched the four heavy metals were: Cu2+﹥Pb2+﹥Zn2+﹥Cd2+. The enriching Cu2+ or Pb2+ capacity of P. supina L. could reach to the hyperaccumulator standard when the concentration was less than 90 mg/L, so P. supina L.may be selected to purify the soil polluted by Cu2+ or Pb2+. It was also suggested that P. supina growing in the soil polluted by Cu2+ or Pb2+ could not be used as vegetable or herbal medicine.更多还原