植物修复是重金属污染土壤修复治理的重要方法。菌草生物产量高，是土壤重金属植物修复研究与应用的重要对象之一。本试验引进菌草品种四个，选用高Cd (2.16 mg/kg)背景土壤，旨在研究不同品种对不同重金属的吸收积累特性，以期筛选出针对不同重金属污染土壤的修复植物。结果表明：1) 菌草品种地上部生物量，巨菌草最高，其次是巨菌草J1，莱牧1号最低。地上部鲜重，巨菌草和巨菌草J1极显著高于莱牧1号(P < 0.01)，巨菌草显著高于紫菌草(P < 0.05)，紫菌草显著高于莱牧1号。地上部干重，巨菌草极显著高于莱牧1号、显著高于紫菌草，巨菌草J1显著高于莱牧1号。2) 菌草品种茎的重金属含量与叶含量间差异显著，其中：Cd含量茎显著高于叶，而Pb、Cr、As、Hg含量叶极显著高于茎。巨菌草J1和巨菌草叶的Cd含量极显著高于莱牧1号；茎Pb含量莱牧1号最高，叶Pb含量巨菌草最高；紫菌草叶的Cr含量极显著高于巨菌草，显著高于巨菌草J1和莱牧1号；莱牧1号茎的As含量最高，紫菌草叶的As含量最高；Hg含量，莱牧1号茎和叶均最高，茎含量品种间差异很小，而叶含量莱牧1号是其它品种的2倍左右，但品种间差异未达显著水平。3) 平均单株地上部不同重金属积累量排序均表现为：巨菌草 > 巨菌草J1 > 紫菌草 > 莱牧1号，其中：巨菌草Cd积累量极显著高于莱牧1号、显著高于紫菌草，巨菌草J1的Cd积累量显著高于莱牧1号；Pb、Cr、As、Hg积累量品种间均无显著差异。可见，巨菌草和巨菌草J1对Cd具有很强的富集能力，而紫菌草对Cr污染治理、莱牧1号对Hg污染治理具有良好的应用潜力。
Phytoremediation is an important method for remediation of heavy metal contaminated soil. The biomass of JUNCAO is high, which is one of the important objects of phytoremediation of heavy metals in soil. Four kinds of JUNCAO were introduced in this experiment, and high CD (2.16 mg/kg) background soil was selected to study the absorption and accumulation characteristics of different varieties of heavy metals, so as to screen out remediation plants for different heavy metal contaminated soil. The results showed that: 1) The aboveground biomass of Giant JUNCAO was the highest, followed by Giant JUNCAO J1, and Laimu No. 1 was the lowest. The aboveground fresh weight of Giant JUNCAO and Giant JUNCAO J1 was significantly higher than that of Laimu No.1 (P < 0.01), and that of Giant JUNCAO was significantly higher than that of Zijuncao (P < 0.05). The aboveground dry weight of Giant JUNCAO was significantly higher than that of Laimu No. 1, significantly higher than that of Zijuncao, and Giant JUNCAO J1 was significantly higher than that of Laimu No.1. 2) The contents of Cd in stems were significantly higher than those in leaves, while Pb, Cr, As and Hg in leaves were significantly higher than those in stems. The results showed that Cd content in the leaves of Giant JUNCAO and Giant JUNCAO J1 was significantly higher than that in Laimu No. 1; the Pb content in stems and leaves of Laimu No.1 was the highest, while that in leaves of Zijuncao was significantly higher than that in Giant JUNCAO J1 and Laimu No. 1; as content in stems and leaves of Giant JUNCAO was the highest, and the contents of Hg in stems and leaves of Laimu No. 1 were the highest, and there were significant differences in stem contents among varieties, the leaf content of Laimu No.1 was about twice as much as that of other
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