作　　者： ; ; ; ; ; ; ; (张伟群）;

机构地区： 韶关学院英东生命科学学院

出　　处： 《广东农业科学》 2011年第20期142-144,共3页

摘　　要： 为了从重金属污染弃耕农田自然恢复植被中筛选出重金属超富集植物,2011年2月采用野外采集与实验室分析的方法对大宝山矿坝心区污染弃耕农田土壤上的斑茅、小白菜、铺地黍、类芦、芦苇和乌毛蕨6种植物进行Cu、Zn、Pb、Cd的富集调查。结果表明:Cu、Zn、Pb、Cd 4种重金属中,Cd最容易被植物吸附转移,之后依次是Pb、Zn、Cu;6种植物中,斑茅和小白菜对Cd、Zn和Cu具有富集优势,斑茅不仅是Cu的超富集植物,而且对Zn、Cd、Pb的富集系数和转运系数也均大于1;小白菜对Zn和Cd具有富集优势,其中对Cd的富集系数高达15.55。因此,斑茅和小白菜可以作为修复Cu、Cd、Zn和Pb多金属污染土壤的富集植物种植,但因小白菜体内4种重金属含量均超出国家食品(叶菜类)中污染物限量标准,所以,小白菜可以作为富集植物种植,但不适宜作为蔬菜食用。 The enrichment of Cu,Zn,Pb and Cd of Saccharum arundinaceum Retz., Brassica rapa L. Chinensis Group., PaniCum repens L., Neyraudia reynaudiana （kunth.）, Phragmites australi, and Blechnum orientale Linn. in Dabaoshan mine area in the polluted and abandoned farmland was studied in order to filtrate super heavy metal enriched plants in February of 2011 by means of field-collected samples and experimental analysis. The results showed that Cd can easily be adsorbed and transferred before Pb, Zn and Cu in turn. Saccharum arundinaceum Retz. had the enrichment advantage of Cu. The Cu content of Saccharum arundinaceum Retz. （2 322.73 mg/kg） exceed the critical value （1 000 mg/kg）, the Cu content of overground part （2 247.47 mg/kg） was higher than the underground part （75.26 mg/kg）, the enrichment and transfer coefficient of Zn, Cd, Pb were also above 1. Brassica rapa L. Chiner^is Group. had the enrichment advantage of Zn and Cd, the enrichment coefficient of Cd reached to 15.55. Therefore, Saccharum arundinaceum Retz., Brassica rapa L. Chinensis Group. can be used for enriching Cu, Cd, Zn, Pb in a polluted farmland. But the four heavy metal content of Brassica rapa I. Chinensis Group. exceed the national pollutant standard of food（leaf vegetables）, so it can be planted as a enrichment plant but not suitable for eating.

关 键 词： 重金属 污染 弃耕农田 富集植物

领　　域： [环境科学与工程]