State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China.
Chemosphere. 2012 Feb;86(8):837-42. doi: 10.1016/j.chemosphere.2011.10.060. Epub 2011 Dec 6.
A field survey was conducted to identify potential Zn accumulators from an artisanal Zn smelting area in southwest China's Guizhou Province. Hydroponic and soil culture experiments were performed to investigate the accumulation ability of Zn in Corydalis davidii. Zn concentrations in roots, stems and leaves of C. davidii in the smelting site were 1.1-3.5, 1.2-11.2, and 3.3-14 mg g(-)(1), respectively, whereas Zn concentrations in roots, stems and leaves of C. davidii in the contaminated site impacted by the Zn smelting were 1.0-2.4, 1.9-6.5, and 3.0-1.1 mg g(-1), respectively. Zn concentrations in leaves and stems of C. davidii were observed at above 10 mg g(-1) that refers to the threshold of Zn hyperaccumulator. The concentration distribution of Zn in C. davidii was leaf>stem>root, and the Zn bioaccumulation factors of C. davidii were above 1. It is concluded that C. davidii has high tolerance to concentrate Zn stress, and that C. davidii is a newly discovered Zn-hyperaccumulator with high biomass in the aboveground parts. Based on the cultivation experiments, C. davidii could reduce Zn concentration by 26.6, 21.2, and 10.2 mg kg(-1)yr(-1) by phytoextraction from the smelting slag, Zn-contaminated soil, and background soil, respectively.
在中国西南部贵州省的一个手工炼锌区进行了一项实地调查，以确定潜在的锌积累植物。进行了水培和土壤培养实验，以研究紫堇属植物对锌的积累能力。在炼锌场，紫堇属植物的根、茎和叶中的锌浓度分别为 1.1-3.5、1.2-11.2 和 3.3-14mg g(-)(1)，而在受锌冶炼影响的污染区，紫堇属植物的根、茎和叶中的锌浓度分别为 1.0-2.4、1.9-6.5 和 3.0-1.1mg g(-1)。在叶和茎中观察到的锌浓度超过 10mg g(-1)，这是锌超积累植物的阈值。锌在紫堇属植物中的浓度分布为叶>茎>根，紫堇属植物的锌生物积累系数均大于 1。因此，紫堇属植物对高浓度锌胁迫有较高的耐受性，并且是一种新发现的地上部分生物量大的锌超积累植物。基于栽培实验，紫堇属植物通过植物提取分别可使炼渣、受锌污染的土壤和背景土壤中的锌浓度降低 26.6、21.2 和 10.2mg kg(-1)yr(-1)。
