三叶鬼针草等7种常见菊科杂草植物对重金属的超富集特征_魏树和.pdf

29 10 　　　　　　 V l.29, N .10 2008 10 Oct., 2008 ENVIRONMENTAL SCIENCE 7 1 1, 2 1, 3 ＊ , , (1., 　110016;2., 　100049;3. , 　30007 1) :, . , 7 ., Cd Cd-Pb-Cu-Zn , , 1, .2 , Cd 25、 50、 100 mg·kg-1 , (p0.05), Cd Cd , Cd 100 mg·kg-1, Cd .3 , Cd 100 mg·kg-1 ., . :;; :X506　:A 　:0250-3301(2008)10-2912-07 Hyperaccumulative Characteristics of 7 Widely Distributing Weed Species in Composite Family Especially Bidens pilosa to Heavy Metals 1 1, 2 1,3 WEI Shu-he , YANG Chuan-jie ,ZHOU Qi-xing (1.Key Lab rat ry f Terrestrial Ec l gical Pr cess, Institute f Applied Ec l gy, Chinese Academy f Sciences, Shenyang 110016, China; 2.Graduate University f Chinese Academy f Sciences, Beijing 100049, China;3.C llege f Envir nmental Science and Engineering, Nankai University, Tianjin 300071, China) Abstract:Hyperaccumulat r is the main p int f phyt remediating c ntaminated s ils by heavy metals, and the identificati n f hyperaccumulat r is still the difficult and key step f phyt remediati n.The utd r p t-culture experiment was used t study the hyperaccumulative characteristics f 7 widely distributing weed species in N rtheast f China t heavy metals.The results in screening experiment sh wed that Taraxacum mongolicum and Bidens p ilosa indicated str ng t lerance t Cd single and Cd-Pb-Cu-Zn c mbined p lluti n, their Cd c ncentrati n in sh t were higher than that in r ts, and the Cd enhancement fact rs (rati f heavy metal c ncentrati n in sh t t that in s il)in sh ts were greater than 1 t , which displayed that the tw plants were with Cd hyperaccumulative characteristics.In c ncentrati n gradient experiment, Cd c ncentrati n in l