Int J Phytoremediation. 2014;16(7-12):694-703. doi: 10.1080/15226514.2013.856843.
This study was conducted to investigate the uptake of lead (Pb) and arsenic (As) from contaminated soil using Melastoma malabathricum L. species. The cultivated plants were exposed to As and Pb in separate soils for an observation period of 70 days. From the results of the analysis, M. malabathricum accumulated relatively high range of As concentration in its roots, up to a maximum of 2800 mg/kg. The highest accumulation of As in stems and leaves was 570 mg/kg of plant. For Pb treatment, the highest concentration (13,800 mg/kg) was accumulated in the roots of plants. The maximum accumulation in stems was 880 mg/kg while maximum accumulation in leaves was 2,200 mg/kg. Only small amounts of Pb were translocated from roots to above ground plant parts (TF < 1). However, a wider range of TF values (0.01-23) for As treated plants proved that the translocation of As from root to above ground parts was greater. However, the high capacity of roots to take up Pb and As (BF > 1) is indicative this plants is a good bioaccumulator for these metals. Therefore, phytostabilisation is the mechanism at work in M. malabathricum's uptake of Pb, while phytoextraction is the dominant mechanism with As.
本研究旨在探讨利用野牡丹（Melastoma malabathricum L.）吸收污染土壤中的铅（Pb）和砷（As）。将栽培植物分别暴露于含 As 和 Pb 的土壤中，观察期为 70 天。分析结果表明，野牡丹根部对 As 的积累范围较广，最高可达 2800mg/kg。茎和叶中 As 的最高积累量为 570mg/kg 植物。对于 Pb 处理，植物根部积累的最高浓度（13800mg/kg）。茎中最大积累量为 880mg/kg，叶中最大积累量为 2200mg/kg。只有少量 Pb 从根部转移到地上部分（TF<1）。然而，As 处理植物的 TF 值范围更广（0.01-23），表明 As 从根部向地上部分的转移更大。然而，根部对 Pb 和 As 的高吸收能力（BF>1）表明，该植物是这些金属的良好生物积累器。因此，在野牡丹吸收 Pb 时起作用的是植物稳定化机制，而在吸收 As 时起主导作用的是植物提取机制。
