Department of Ecological Engineering, Pukyong National University, Busan, Korea.
Int J Phytoremediation. 2013;15(6):536-49. doi: 10.1080/15226514.2012.723057.
The effects of humic acid (HA) on heavy-metal uptake by plants and degradation of total petroleum hydrocarbons (TPHs) in a wetland microcosm planted with Phragmites communis were evaluated by comparing waterlogged soils and water-drained upland soils. Experiments were conducted on soils artificially contaminated with heavy metals (Pb, Cu, Cd, Ni) and diesel fuel. HA showed a positive influence on biomass increase for all conditions, but more for belowground than aboveground biomass, and lower in contaminated than uncontaminated soil. The bioavailability and leachability factor (BLF) for all heavy metals except Ni increased with HA addition in both the control and the P. communis planted microcosms, suggesting that more heavy metals could be potentially phytoavailable for plant uptake. Microbial activities were not affected by both heavy metals and TPH contamination, and HA effects on stimulating microbial activities were much greater in the contaminated soil than under uncontaminated conditions. HA addition enhanced the degradation of TPH and n-alkane in waterlogged conditions. The results show that HA can increase the remedial performance in P. communis dominated wetlands simultaneously contaminated with heavy metals and petroleum hydrocarbons and thus prevent contamination of groundwater or other adjacent ecosystems.
研究了富里酸（HA）对湿地植物吸收重金属和总石油烃（TPH）降解的影响，湿地中种植了芦苇（Phragmites communis），通过对比水饱和土壤和排水旱地土壤进行研究。实验在人为添加重金属（Pb、Cu、Cd、Ni）和柴油燃料的土壤上进行。HA 对所有条件下的生物量增加都有积极影响，但对地下生物量的影响大于地上生物量，对污染土壤的影响小于非污染土壤。在对照和芦苇种植微宇宙中，除 Ni 以外的所有重金属的生物有效性和淋滤因子（BLF）都随 HA 的添加而增加，这表明更多的重金属可能对植物吸收具有潜在的生物可利用性。微生物活性不受重金属和 TPH 污染的影响，HA 对刺激微生物活性的影响在污染土壤中比在非污染条件下大得多。HA 的添加增强了水饱和条件下 TPH 和正构烷烃的降解。结果表明，HA 可以提高受重金属和石油烃同时污染的芦苇为主湿地的修复性能，从而防止地下水或其他相邻生态系统受到污染。
