Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China.
Int J Phytoremediation. 2011 Sep;13(8):750-64. doi: 10.1080/15226514.2010.525558.
A growth chamber pot experiment and a field plot experiment were conducted with the installation of rhizobags to study the effects of repeated phytoextraction by Sedum plumbizincicola on the bioavailability of Cd and Zn in the rhizosphere and bulk soil Repeated phytoextraction gave significantly lower Cd and Zn concentrations in both rhizosphere and bulk soil solutions compared with soil without repeated phytoextraction. The depletion rates of NH40Ac-extractable Zn in rhizosphere soil in each treatment (L-PS, L-NPS, H-PS, and H-NPS) were 59.7, 18.0, 16.3, and 18.6%, respectively. For NH40Ac-extractable Cd, the depletion rates in treatments L-PS, L-NPS, H-PS, and H-NPS were 6.67, 29.4, 40.3, and 41.4%, respectively. Plant shoot biomass decreased in the order H-PS > H-NPS > L-PS > L-NPS, with dry weights of 0.56, 0.42, 1.43, and 1.21 g pot(-1), respectively. Plant Cd uptake increased with increasing aqua-regia extractable metal concentrations. The NH4OAc extraction procedure was satisfactory to predict the bioavailability of Cd and Zn in rhizosphere soil in terms of shoot uptake by S. plumbizincicola with positive correlation coefficients of 0.545 (p < 0.05) and 0.452 (p < 0.05), respectively. The field study results show a slight decrease in water soluble and NH4OAc-extractable metals, a trend similar to that found in the pot experiment.
采用根袋法进行生长室盆栽试验和田间小区试验，研究了小花南芥反复植物提取对根际和土壤中 Cd 和 Zn 生物有效性的影响。与未进行反复植物提取的土壤相比，反复植物提取使根际和土壤溶液中的 Cd 和 Zn 浓度显著降低。在每个处理（L-PS、L-NPS、H-PS 和 H-NPS）中，根际土壤中 NH40Ac 可提取态 Zn 的消耗率分别为 59.7%、18.0%、16.3%和 18.6%。对于 NH40Ac 可提取态 Cd，处理 L-PS、L-NPS、H-PS 和 H-NPS 中的消耗率分别为 6.67%、29.4%、40.3%和 41.4%。植株地上部生物量的大小顺序为 H-PS > H-NPS > L-PS > L-NPS，干重分别为 0.56、0.42、1.43 和 1.21 g 盆-1。植物 Cd 吸收量随酸消解态金属浓度的增加而增加。NH4OAc 提取程序可满意地预测小花南芥根际土壤中 Cd 和 Zn 的生物有效性，与植株地上部 Cd 吸收量呈正相关，相关系数分别为 0.545（p<0.05）和 0.452（p<0.05）。田间研究结果表明，水溶态和 NH4OAc 可提取态金属略有下降，与盆栽试验结果相似。
