摘要
通过盆栽试验,研究了超富集植物(蜈蚣草和龙葵)、富集植物(小飞蓬和马唐)对Cd,Cr,Cu,Pb和Zn 5种重金属的共积累特性。结果表明,几种植物根系干物质量最大的为蜈蚣草,而地上部分干物质量的最大的为马唐,且马唐的根冠比最小。几种植物对不同重金属元素的土壤有效态含量、植株体内含量和积累量不同,但5种重金属迁移率最高的均为龙葵。几种植物根系重金属总含量最大的为马唐,地上部分则为小飞蓬,地上部分重金属共积累总量的大小顺序为:马唐>龙葵>蜈蚣草>小飞蓬,而重金属共积累迁移率大小顺序为:龙葵>马唐>小飞蓬>蜈蚣草。因此,在较短时间内,对Cd,Cr,Cu,Pb和Zn复合污染的土壤进行植物修复的首选材料是马唐,其次为龙葵。
A pot experiment studied the total accumulation characteristics of cadmium, chromium, copper, plumbum and zinc in hyperaccumulator （Pterts vittata L. and Solanum nigrum L.） and accumulator （Conyza canadensis L. Cronq. and Digitaria sanguinalis （L.） Scop.）. The results showed as follows： the maximum root dry weight was P. vittata, while the maximum shoot dry weight was D. sanguinalis, and the minimum of root to shoot ratio was D. sanguinalis too. The availability of five heavy metals in soil, and the contents and accumulations of five heavy metals in hyperaccumulator and accumulator were different. The highest mobility ratio of five heavy metals was S. uigrum. The maximum total content of five heavy metals in root was D. sanguinalis, and the maximum total content of five heavy metals in shoot was C. Canadensis. The order of five heavy metals total accumulation in shoot was： D. sanguinalis 〉 S. nigrum 〉 P. vittata 〉 C. Canadensis, and that in root was： S. nigrum 〉 D. sanguinalis 〉 C. Canadensis 〉 P. vittata. Therefore, in a short period of time, the best plant for phytoremediation of cadmium, chromium, copper, plumbum and zinc compound contaminated soil was D. sanguinalis, and followed by S. nigrum.
出处
《环境科技》
2013年第3期31-34,65,共5页
Environmental Science and Technology
关键词
重金属
·共积累
超富集植物
富集植物
Heavy metal
Total accumulation
Hyperaccumulator
Accumulator
