碳酸氢铵对白茅和藨草吸收重金属的影响

Effects of Ammonia Bicarbonate on the Absorption of Heavy Metals in Imperata cylindrica and Scirpus triqueter

[目的]为人工修复重金属污染土壤探索新方法。[方法]以分析纯碳酸氢铵为调控剂,以白茅和藨草为试材进行盆栽调控试验并在3个月后测定其重金属含量。[结果]3~5 g/L碳酸氢铵显著增加了白茅对Zn的积累（5 809.11 mg/kg）。3 g/L碳酸氢铵显著增加了白茅对Pb的积累（约38.11 mg/kg）。0.5 g/L碳酸氢铵调控下,藨草对土壤中Pb污染的净化率最大（0.01%）。5 g/L碳酸氢铵调控下,白茅对土壤中Cd污染的净化率最大（0.17%）,藨草对土壤中Zn污染的净化率最大（0.4%）,白茅对土壤中Pb污染的净化率最大（0.01%）。3 g/L碳酸氢铵调控下,藨草对土壤中Cd污染的净化率最大（0.1%）,白茅对土壤中Zn污染的净化率最大（0.31%）。[结论]碳酸氢铵能提高植物对污染土壤的净化率。

[ Objective ] The purpose was to explore the new method of repairing heavy metal polluted soil by human-induced restoration. [ Method] With analytically pure ammonia bicarbonate as restraining reagent, lmperata cylindrical and Scrirpus triqueter as tested materials, the regulated pot culture experiment was performed and their contents of heavy metals were determined after 3 months. [ Result] 3 - 5 g/L ammonia bicarbonate significantly increased the accumulation of Zn in/. cylindrical and its accumulation amount was 5 809.11 mg/kg. 3 g/L ammonia bicarbonate significantly increased the accumulation of Pb in L cylindrical and its accumulation amount was about 38.11 mg/kg. Under the regulation with 0.5 g/L ammonia bicarbonate, the purifying rate of S. triqueter on eb in polluted soil was highest, being 0.01%. Under the regulation with 5 g/L ammonia bicarbonate, the purifying rate of L cylindrical on Cd in polluted soil was highest, being 0.17% ;the purifying rate of S. triqueter on Zn in polluted soil was highest, being 0.4% ; the purifying rate of I. cylindrical on Ph in polluted soil was highest, being 0.01%. Under the regulation with 3 g/L ammonia bicarbonate, the purifying rate of S. triqueter on Cd in polluted soil was highest, being 0.1% ; the purifying rate of I. cylindrical on Zn in polluted soil was highest, being 0.31%. [ Conclusion ] Ammonia bicarbonate could enhance the purifying rate of plants on polluted soil.