Marques Ana P G C, Rangel António O S S, Castro Paula M L
Escola Superior de Biotecnologia, Universidada Católica Portuguesa, Rua Dr. António Bernardino de Almeida, 4200-072 Porto, Portugal.
J Environ Qual. 2007 Apr 5;36(3):646-53. doi: 10.2134/jeq2006.0278. Print 2007 May-Jun.
The levels of zinc accumulated by roots, stems, and leaves of two plant species, Rubus ulmifolius and Phragmites australis, indigenous to the banks of a stream in a Portuguese contaminated site were investigated in field conditions. R. ulmifolius, a plant for which studies on phytoremediation potential are scarce, dominated on the right side of the stream, while P. australis proliferated on the other bank. Heterogeneous Zn concentrations were found along the banks of the stream. Zn accumulation in both species occurred mainly in the roots, with poor translocation to the aboveground sections. R. ulmifolius presented Zn levels in the roots ranging from 142 to 563 mg kg(-1), in the stems from 35 to 110 mg kg(-1), and in the leaves from 45 to 91 mg kg(-1), vs. average soil total Zn concentrations varying from 526 to 957 mg kg(-1). P. australis showed Zn concentrations in the roots from 39 to 130 mg kg(-1), in the stems from 31 to 63 mg kg(-1), and in the leaves from 37 to 83 mg kg(-1), for the lower average soil total Zn levels of 138 to 452 mg kg(-1) found on the banks where they proliferated. Positive correlations were found between the soil total, available and extractable Zn fractions, and metal accumulation in the roots and leaves of R. ulmifolius and in the roots and stems of P. australis. The use of R. ulmifolius and P. australis for phytoextraction purposes does not appear as an effective method of metal removing, but these native metal tolerant plant species may be used to reduce the effects of soil contamination, avoiding further Zn transfer to other environmental compartments.
在葡萄牙一个受污染场地的溪流岸边的野外条件下，研究了两种本土植物——欧洲黑莓（Rubus ulmifolius）和芦苇（Phragmites australis）的根、茎和叶中积累的锌含量。欧洲黑莓在溪流右侧占主导地位，而关于其植物修复潜力的研究较少，芦苇则在对岸大量繁殖。溪流两岸的锌浓度存在差异。两种植物中的锌积累主要发生在根部，向地上部分的转运较差。欧洲黑莓根部的锌含量范围为142至563 mg kg⁻¹，茎部为35至110 mg kg⁻¹，叶片为45至91 mg kg⁻¹，而土壤总锌平均浓度在526至957 mg kg⁻¹之间。芦苇根部的锌浓度为39至130 mg kg⁻¹，茎部为31至63 mg kg⁻¹，叶片为37至83 mg kg⁻¹，其生长的岸边土壤总锌平均含量较低，为138至452 mg kg⁻¹。在土壤总锌、有效锌和可提取锌组分与欧洲黑莓根和叶以及芦苇根和茎中的金属积累之间发现了正相关关系。将欧洲黑莓和芦苇用于植物提取目的似乎并不是一种有效的金属去除方法，但这些本土耐金属植物物种可用于减少土壤污染的影响，避免锌进一步转移到其他环境组分中。
