Zhou Tong, Zhu Dong, Wu Longhua, Xing Weiqin, Luo Yongming, Christie Peter
a Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences , Nanjing , China.
b School of Chemistry and Chemical Engineering, Henan University of Technology , Zhengzhou , China.
Int J Phytoremediation. 2018;20(12):1243-1249. doi: 10.1080/15226514.2016.1156641.
Most studies on the phytoextraction of cadmium (Cd) and zinc (Zn) by the hyperaccumulator () have been conducted in metal contaminated acidic and neutral soils. However, little information is available on phytoremediation of calcareous soils. Two experiments were conducted to investigate the phytoextraction efficiency of in a contaminated calcareous soil in He'nan province, north China. In a field experiment there was no significant decrease in shoot biomass production or metal (Cd and Zn) concentration in the shoots after three successive repeated phytoextractions. Repeated phytoextraction had no significant effect on the percentage distribution of Cd or Zn fractions in the soil even though the soil total Cd and Zn concentrations decreased by 32.8 and 19.7%, respectively. In a pot experiment the shoot biomass production and Zn and Cd uptake by increased significantly with growth in metal contaminated calcareous soil amended with organic fertilizer, perlite and vermiculite. The results indicate that can maintain sustainable uptake of Cd and Zn from the calcareous soil and enhancement of soil fertility and structure will significantly increase the phytoextraction efficiency.
大多数关于超富集植物（）对镉（Cd）和锌（Zn）进行植物提取的研究是在金属污染的酸性和中性土壤中开展的。然而，关于石灰性土壤植物修复的信息却很少。开展了两项试验，以研究在中国北方河南省某污染石灰性土壤中超富集植物的植物提取效率。在一项田间试验中，连续三次重复植物提取后，地上部生物量产量或地上部金属（Cd和Zn）浓度均未显著降低。尽管土壤总Cd和Zn浓度分别下降了32.8%和19.7%，但重复植物提取对土壤中Cd或Zn形态的百分比分布没有显著影响。在一项盆栽试验中，在添加了有机肥、珍珠岩和蛭石的金属污染石灰性土壤中，随着植物生长，超富集植物的地上部生物量产量以及对Zn和Cd的吸收显著增加。结果表明，超富集植物能够持续从石灰性土壤中吸收Cd和Zn，提高土壤肥力和改良土壤结构将显著提高植物提取效率。
