【摘要】 对湘潭锰矿业废弃地土壤重金属含量、自然定居的草本植物对重金属吸收与转移特征进行了研究.结果表明:土壤重金属含量较高,其中Zn、Cd、Pb的含量超过国家土壤环境质量标准(GB15618-1995)的3级标准,是一类被重金属复合污染的土壤;自然定居的草本植物对重金属的吸收表现为富集型植物(如商陆P hy tolacca acinosa)、根部囤积型植物(如野茼蒿C rassocepha lumcrep id ioid es)、规避型植物(如灯心草M edu lla J unci)等3种类型.研究结果为寻找和发现适合当地气候条件与土壤条件的重金属耐性植物提供科学依据.更多还原

【Abstract】 Heavy-metal contents and absorption characteristics of naturally restored plants were investigated in the wasteland of Xiangtan Manganese Mine,Hunan Province. Results show that the wasteland has a high content of heavy metals,for the contents of Zn,Cd and Pb are all beyond National Standards for Environment Quality of Grade Three Soil,and becomes a type of complex heavy-metal contaminated soil;and that the uptake of heavy metals by naturally restored herbaceous plants can be classified into three types according to the metal contents in plant shoots and roots: they are(1) the accumulator,eg.Phytolacca acinosa,which absorbs a large content by the roots and transports it to the shoots,(2) the root compartment,eg.Crassocephalum crepidioides,which also absorbs a large content but mainly in the roots,and(3) the excluder,eg.Medulla Junci,which absorbs a smaller content than the accumulator.This provides a scientific basis for searching and finding out tolerant plants which are adaptable to local climates and soil conditions.更多还原