Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, PR China.
J Hazard Mater. 2010 Sep 15;181(1-3):480-4. doi: 10.1016/j.jhazmat.2010.05.038. Epub 2010 May 13.
Phytoextraction and phytostabilization are well-established sub-processes of phytoremediation that are being followed for in situ remediation of soils contaminated with toxic metals. Taraxacum mongolicum Hand-Mazz, a newly reported Cd accumulator has shown considerable potential for phytoextracting Cd. This paper investigated the effects of urea and chicken manure on T. mongolicum phytoextracting Cd from soil using pot culture experiments. The results showed that urea application did not affect the Cd concentrations in root, leaf, inflorescence and shoot of T. mongolicum, but chicken manure significantly decreased them (p<0.05) by 23.5%, 31.5%, 24.8% and 30.4% owing to decreased extractable Cd. Urea and chicken manure significantly increased (p<0.05) the phytoextraction capacities (microg pot(-1)) of T. mongolicum to Cd by 3-5-fold due to the increase in shoot biomass (increased 4-7 folds). Further, addition of urea and chicken manure increased organic matter, nitrogen, phosphorus and potassium, the microorganism count, urease and phosphatase activities of soil indicating their eco-friendly function. Urea is ideal for optimizing phytoextraction of T. mongolicum to Cd, while chicken manure is appropriate for phytostabilization.
植物提取和植物稳定是植物修复中成熟的子过程，正被用于原位修复受有毒金属污染的土壤。蒲公英（Taraxacum mongolicum Hand-Mazz）是一种新报道的镉积累植物，具有相当大的镉提取潜力。本文采用盆栽实验研究了尿素和鸡粪对蒲公英从土壤中提取镉的影响。结果表明，尿素的应用并不影响蒲公英根、叶、花序和地上部分的镉浓度，但鸡粪由于可提取的镉减少，显著降低了镉浓度（p<0.05），分别降低了 23.5%、31.5%、24.8%和 30.4%。由于地上生物量的增加（增加了 4-7 倍），尿素和鸡粪显著增加了蒲公英对镉的提取能力（每盆微克）（增加了 3-5 倍）。此外，尿素和鸡粪的添加增加了土壤中的有机质、氮、磷和钾、微生物数量、脲酶和磷酸酶活性，表明它们具有生态友好功能。尿素是优化蒲公英对镉提取的理想选择，而鸡粪则适合用于植物稳定。
