Research Center for Soil Contamination & Environment Remediation, Southwest Forestry University, Yunnan 650224, China; Soil and Water Sciences Department, University of Florida, Gainesville, FL 32611, United States.
Soil and Water Sciences Department, University of Florida, Gainesville, FL 32611, United States.
Chemosphere. 2018 Sep;206:736-741. doi: 10.1016/j.chemosphere.2018.05.055. Epub 2018 May 10.
The ability of As-hyperaccumulator Pteris vittata to remove As from two contaminated soils (CCA from an As-treated wood facility and DVA from a cattle-dipping vat) over 5 years was investigated for the first time. The goal was to evaluate P. vittata's ability to continuously remove As during 10 harvests and identify how soil As was affected by P. vittata under P-sufficient (P-fertilizer) and P-limiting (phosphate rock) conditions. Sequential extraction was used to determine changes in metal distribution among different soil fractions. The high frond biomass production occurred on the 9th (62.1-63.9 and 35.6-63.5 g plant) and 10th harvest (58.6-60.7 and 51.9-57.1 g plant) for CCA and DVB soils, though frond As concentration decreased. Soil arsenic removal averaged 7-10% per harvest during the 1-6th harvests and was reduced to 0-3% during the 7-10th harvests for DVA and CCA soils. Arsenic from all fractions, excluding the residual fraction, was affected by plant uptake. The largest reduction occurred in the amorphous fraction of CCA-soil at 64-66% (61.2-61.5 to 20.8-21.8 mg kg) and in the crystalline fraction of DVA-soil at 50-86% (2.18-4.35 to 0.61-1.10 mg kg). Soil As concentrations were reduced by 37-47% from 26.7 to 129 to 15.6-16.8 and 68.9-70.1 mg kg for the DVA and CCA soils, respectively. Our data indicated that P. vittata efficiently solubilized non-labile As under P-limiting conditions without impacting its As depletion.
首次研究了凤尾蕨作为砷超富集植物从两种污染土壤（CCA 来自砷处理木材设施，DVA 来自牛浸浴缸）中去除砷的能力。目标是评估凤尾蕨在 10 次收获期间连续去除砷的能力，并确定在磷充足（施加磷肥）和磷限制（磷矿）条件下，土壤砷如何受到凤尾蕨的影响。连续提取用于确定金属在不同土壤部分之间的分布变化。尽管凤尾蕨叶片中的砷浓度降低，但在第 9 次（CCA 土壤为 62.1-63.9 和 35.6-63.5 g 植株；DVA 土壤为 58.6-60.7 和 51.9-57.1 g 植株）和第 10 次收获（CCA 土壤为 58.6-60.7 和 51.9-57.1 g 植株；DVA 土壤为 58.6-60.7 和 51.9-57.1 g 植株）时，凤尾蕨产生了较高的叶片生物量。在第 1-6 次收获期间，土壤砷的去除率平均为每收获期 7-10%，而在第 7-10 次收获期间，DVA 和 CCA 土壤的去除率降低至 0-3%。除残渣部分外，所有部分的砷均受植物吸收的影响。在 CCA 土壤中，无定形部分的降幅最大，为 64-66%（61.2-61.5 至 20.8-21.8 mg kg），在 DVA 土壤中，结晶部分的降幅为 50-86%（2.18-4.35 至 0.61-1.10 mg kg）。与 DVA 和 CCA 土壤相比，土壤砷浓度分别从 26.7 降至 129 至 15.6-16.8 和 68.9-70.1 mg kg，降幅为 37-47%。我们的数据表明，凤尾蕨在磷限制条件下有效溶解非稳定砷，而不影响其砷的耗尽。
