不同植物对矿区土壤重金属的吸收  

Absorption of Heavy Metals by Several Species of Plants in Gold-Mining Area

作　　者：李庚飞[1] 

机构地区：[1]渭南师范学院,渭南714000

出　　处：《东北林业大学学报》2012年第9期63-66,共4页Journal of Northeast Forestry University

基　　金：陕西省教育厅自然科学专项科研计划项目(11JK0763)

摘　　要：以潼关县黄金生产区及附近的白草(Pennisetum centrasiaticum Tzvel.)、酸模叶蓼(Polygonum lapathi-folium L.)、虎尾草(Chloris virgata Swartz)和金盏银盘(Bidens pilosa L.)为研究对象,采用火焰原子吸收光谱法测定了其Cu、Cd、Zn重金属质量分数,确定了建立人工生态系统的植物种类。结果表明:酸模叶蓼根系对Cu的转移能力较强,金盏银盘对Cu和Cd的富集能力均较强;4种植物对金属Zn均有较好的吸收富集作用,但白草的富集能力最强。金盏银盘是建立人工生态系统吸收Cd的首选植物;虎尾草可以作为建立人工生态系统的伴生种,以增加生态系统的多样性;白草是首选建立人工生态系统吸收Zn的植物。An experiment was conducted to study contents of heavy metals in several species of plants in and around a gold-mining area in Tongguan County so as to determine the plant species suitable for the establishment of artificial ecosystem. Pennisetum centrasiaticum Tzvel. , Polygonum lapathifolium L. , Chloris virgata Schwartz and Bidens pilosa L. were selected as study objects, and the contents of Cu, Cd and Zn were determined. Results show that the roots of P. lapathifolium have higher transfer capacity of Cu compared with the other three species. B. pilosa has the highest enrichment coefficients of Cu and Cd. The four species of plants all have high absorbing capacity of Zn, but P. centrasiaticum has the highest absorption and accumulation of Zn. B. pilosa is the first choice among the four species of plants for the establishment of arti- ficial ecosystem, while C. virgata can be chosen as the main accompanying plant to enhance the biodiversity of ecosystem. And P. centrasiaticum is the first choice for absorbing Zn in artificial ecosystem.

关 键 词：根际土壤 重金属污染 金矿 人工生态系统 

分 类 号：X502[环境科学与工程—环境工程]