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Journal of Zhejiang University: Agric. & Life Sci.  2011, Vol. 37 Issue (4): 465-472    DOI: 10.3785/j.issn.1008-9209.2011.04.017
Resource & environmental sciences     
Remediation efficiency of Cd-B[a]P combined polluted soil by Sedum alfredii
LI Ting-qiang , DONG Zeng-shi , JIANG Hong , LI Bing , YANG Xiao-e
1 . Ministry of Education Key Laboratory of Environmental Remediation and Ecosystem Health , College of Environmental and Resource Sciences , Zhejiang University , Hangzhou 310058 , China ; 2 . Hangz hou W anxiang polytechnic ,Hangzhou 310023 , China ;3 . College of Resource and Environmental Sciences , Sichuan Agricultural University , Y a′an , Sichuan 625014 , Chin
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Abstract  Remediation efficiency of cadmium (Cd) and benzo [a] pyrene ( B[a]P) combined polluted soil by Sedum al f redii Hance was studied using pot experiment under controlled temperature and natural light during cultivation .The results showed that the growth of hyperaccumulating ecotype ( HE) of S .al f redii was inhibited under high B[a]P level (2 5mg/kg -1  ) , whereas the biomass of nonhyperaccumulating ecotype (NHE) decreased significantly due to Cd toxicity . When treated with low Cd (1 mg/kg -1  ) , the root biomass of both HE and NHE were increased by 5mg/kg -1  B[a]P . Cadmium concentration in the shoot of the HE was much greater than the NHE and was not influenced by B[a]P supply level . The B[a]P concentrations in both shoot and root of both ecotype of S . alfredii were controlled by B[a]P level in the soil instead of Cd . The removal efficiency of Cd from Cd‐B[a]P combined polluted soil by the HE was much greater than the NHE , however , significant decrease of Cd removal efficiency was observed with treatment of 25mg/kg -1B[a]P . The removal efficiency of B[a]P from unplanted soil was43.7%, whereas it was increased to 58.2% after planted with both ecotypes of S . alfredii .All the results above suggest that hyperaccumulating ecotype of S . al f redii has great potential for phytoremediation of Cd and B[a]P moderately contaminated soil .

Published: 20 July 2011
Cite this article:

LI Ting-qiang,DONG Zeng-shi,JIANG Hong,LI Bing,YANG Xiao-e. Remediation efficiency of Cd-B[a]P combined polluted soil by Sedum alfredii. Journal of Zhejiang University: Agric. & Life Sci., 2011, 37(4): 465-472.

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http://www.zjujournals.com/agr/10.3785/j.issn.1008-9209.2011.04.017     OR     http://www.zjujournals.com/agr/Y2011/V37/I4/465


东南景天对镉-苯并[ a]芘复合污染土壤的修复效果

采用盆栽试验研究2 种生态型东南景天对镉-苯并[a]芘(Cd-B[a]P)复合污染土壤的修复效果.结果表明:在Cd-B[a]P复合处理条件下,超积累生态型东南景天生长主要受高浓度B[a]P影响,而Cd 是抑制非积累生态型东南景天生长的主要因素,在低Cd 处理条件下,5mg/kg -1 B[a]P能促进2种生态型东南景天根系的生长;超积累生态型东南景天地上部镉含量远远大于非积累生态型,且不受B[a]P水平的影响;2 种生态型东南景天各部位B[a]P含量主要受土壤B[a]P水平的影响;在Cd-B[a]P复合处理条件下,超积累生态型东南景天对镉的去除效果显著高于非积累生态型,但在高质量浓度B[a]P(25 mg/kg -1 )处理条件下,镉的去处效果明显降低;未种植物的土壤B[a]P平均去除率达到43.7%,而种植东南景天的土壤B[a]P平均去除率达到58.2%.本结果说明超积累生态型东南景天对中轻度Cd-B[a]P复合污染土壤具有较好的修复效果.
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