Institute of Ecology, South China Botanical Garden, The Chinese Academy of Sciences, Guangzhou 510650, China.
Bioresour Technol. 2010 Mar;101(6):2063-6. doi: 10.1016/j.biortech.2009.11.065. Epub 2009 Dec 14.
A pot experiment was conducted in a greenhouse to evaluate the phytoremediation abilities of four forage grasses with respect to soil Cd and Zn pollution. High Cd pollution significantly increased the biomass of Pennisetum americanum (L.) LeekexPennisetum purpureum Schumach, showed no effect on Silphium perfoliatum Linn and significantly decreased biomass of Paspalum atratum cv. Reyan No. 11 and Stylosanthes guianensis cv. Reyan II. High Zn pollution significantly decreased biomass of all grasses. Shoot Cd extraction amounts were 624, 179, 21 and 15mug/plant for P. americanumxP. purpureum, P. atratum, S. guianensis and S. perfoliatum respectively at soil Cd concentration of 8mg/kg. The shoot Zn extraction amount for P. americanumxP. purpureum was 8189mug/plant while the other three grasses were severely intoxicated at the soil Zn concentration of 600mg/kg. P. americanumxP. purpureum and P. atratum could be useful for phytoextraction of either or both Cd and Zn pollution; S. perfoliatum could be regarded as a candidate species for phytostabilization of Cd contamination; while S. guianensis had no remediation capability.
采用温室盆栽试验研究了 4 种牧草对土壤 Cd 和 Zn 污染的植物修复能力。高浓度 Cd 污染显著增加了杂交狼尾草和紫狼尾草的生物量，对柳枝稷和柱花草的生物量没有影响，而显著降低了匍匐冰草和热研 11 号柱花草的生物量。高浓度 Zn 污染显著降低了所有牧草的生物量。当土壤 Cd 浓度为 8mg/kg 时，杂交狼尾草和紫狼尾草的地上部 Cd 提取量分别为 624、179μg/株，匍匐冰草、柱花草的地上部 Cd 提取量分别为 21、15μg/株。当土壤 Zn 浓度为 600mg/kg 时，杂交狼尾草和紫狼尾草的地上部 Zn 提取量为 8189μg/株，而其他 3 种牧草则受到严重毒害。杂交狼尾草和匍匐冰草可用于 Cd 和 Zn 复合污染的植物提取；柳枝稷可作为 Cd 污染的植物稳定化候选物种；而柱花草则没有修复能力。
