高羊茅和黑麦草对污染土壤Cd，Pb，Zn的富集特征

Study on Characteristics of Lolium multif lorum and Festuca arundinacea Absorbing and Accumulating Cadmium, Lead and Zinc from Contaminated Soil with These Metals

以潮褐土为供试土壤,通过模拟试验研究了高羊茅(Festuca arundinacea)和黑麦草(Lolium multif lorum)对复合污染土壤Cd,Pb,Zn的富集特点。结果表明,在土壤Cd,Pb,Zn复合污染处理条件下,高羊茅Cd,Pb,Zn的平均富集量,地上部分别为5.76,19.77,418.18 mg/kg,地下部分别为129.82,256.66,354.66 mg/kg;黑麦草Cd,Pb,Zn的平均富集量,地上部分别为5.57,26.13,467.18 mg/kg,地下部分别为114.53,155.98,513 48 mg/kg。通过方差分析,这两种草坪草的重金属富集量没有显著差异,并且富集规律呈现较为一致的特点。地上部的富集量和土壤重金属含量的离子冲量呈显著的线性相关。这两种草坪草对其重金属的富集能力顺序为:Zn>Cd>Pb,其中对Zn的吸收呈现富集植物的特性规律,当土壤Zn含量>400 mg/kg时,其转运系数>1,地上部对Zn的富集能力很强,可作为Zn污染土壤的修复植物。通过偏相关和多元回归分析表明,这两种草坪草在土壤Cd,Pb,Zn复合污染条件下均未产生复合效应。

It was studied that the characteristics of both species of turfgrass （ Festuca arundinacea ＆ Lolium multiflorurn） accumulated cadmium, lead and zinc from the soil contaminated with these metals in the pot test, in which the soil was meadow cinnamon of simulated compound contamination with Cd, Pb and Zn. The results indicated that average concentration of Cd, Pb and Zn in the shoots of Festuca arundinacea respectively were 5.76 mg/kg, 19.77 mg/kg, 418.18 mg/kg; and average concentration of Cd, Pb and Zn in the roots of Festuca arundinacea respectively were 129.82 mg/kg, 256.66 mg/kg, 354.66 mg/kg. Meanwhile, average concentration of Cd, Pb and Zn in the shoots of Loliurn multiflorum respectively were 5.57 mg/kg, 26.13 mg/kg,467.18 mg/kg; and average concentration of Cd, Pb and Zn in the roots of Lolium multifllorum respectively were 114.53 mg/kg, 155.98 mg/kg, 513.48 mg/kg. It was also indicated that contents of the both species to accumulate these metals from the soil are no significant differences through variance analysis of the testing datum, so the characteristics of their accumulation are uniform. The ionic impulsion in the both shoots to absorb theses metals are significantly liner correlation with the ionic impulsion of these metals in the soil. Capacities of the both species accumulating these metals are： Zn〉Cd〉Pb. When contents of added Zn in the soil are more than 400 mg/kg, all the absorption coefficients of the both species are more than 1 for accumulating Zn from the soil, which can accord with standard of hyperaccumulators, and capacities of accumulating Zn in the shoots of the both species are stronger. Accordingly, the both species can be used to remediate Zn contaminate soil as hyperaccumulators. It has been confirmed that interaction of the both species to absorb the three heavy metals didn＇t exist in the test by the means of partial correlation analysis and multiple regression analysis.