小头蓼(P.Microcephalum)对矿区铜的吸收积累研究

Copper accumlation by polygonum microcephalum D.Don from copper mining spoils in Yunnan Province

调查并分析云南省铜矿区的植物区系及土壤理化特性 ,发现小头蓼 (P .Microcephalum)在云南省高海拔铜矿区生长旺盛 ,是该地区的优势植物种 ,小头蓼生长的土壤基质富含铜 ,其它养分条件适中 ,研究表明小头蓼具有较强的富集铜的能力 ;随土壤中铜含量的增加 ,植物根系铜含量也相应增加 ,但叶部铜含量变化与土壤铜含量之间无相关性 ,研究认为该植物具有对铜污染土壤的植物固定潜能 .此外 ,还指出最适于小头蓼富集铜的土壤条件为土壤有机质 1%— 1 5 % 。

It was found that P.microcephalum grows extensively on copper mining spoils in Yunnan Province as a representative of typical high\|elevation copper flowers.Plants and their associated soil samples collected from several copper mines in the Province were analyzed.The results showed that P.microcephalum can grow well on mining spoils rich in copper but with medium nutrient supply.Copper concentration in the roots tended to increase with copper increase in the substrates,however,the relation between copper in the leaves and soil copper is not clear.It is suggested that P.microcephalum may possess the potential for phytostabilization of metal\|contaminated soils and for biogeochemical prospecting.