无色菌产酸对土壤溶液重金属浓度及海州香薷重金属吸收的影响

Effects of Acid Production of Achromatium sp. on Desorption of Soil Heavy Metals and Their Uptake by Elsholtzia splendens

利用培养试验和盆栽试验研究了一株无色菌(Achromatium sp.)对复合污染土壤上Cu、Zn的溶出效果及其对海州香薷(Elsholtzia splendens)生长和Cu、Zn吸收性的影响。结果表明,菌株在培养试验(pH=4.65)中的产酸效果较盆栽试验(7.3<pH<8.2)更佳;土壤溶液可溶性Cu与pH显著正相关,而可溶性Zn与pH显著负相关;和对照处理相比,无色菌处理提高海州香薷的生物量和地上部Cu浓度,显著(p<0.05)提高海州香薷对污染土壤中Cu的去除潜力。

An incubation experiment and a pot experiment were conducted to investigate the influences of an ,Achromatium sp. strain on the desorption of Cu/Zn of a soil contaminated by heavy metals and the growth and the uptake of Cu/Zn of Elsholtzia splendens. The results indicated that the strain produced more acid in the incubation experiment （pH = 4.65） than in the pot one （7.3 〈 pH 〈 8.2）; The soluble Cu concentration in the soil solution was significantly positively correlated to pH while the soluble Zn concentration significantly negatively to pH value; Compared with CK, the bacterium increased E. splendens shoot biomass and shoot Cu content, and increased significantly （p 〈 0.05） Cu cleaning-up by E. splendens from the soil polluted by heavy metals.