Institute of Soil Science, University of Natural Resources and Applied Life Sciences, Peter Jordan-Strasse 82, A-1190 Vienna, Austria.
Environ Pollut. 2009 Oct;157(10):2871-7. doi: 10.1016/j.envpol.2009.04.003. Epub 2009 May 14.
The effect of increasing soil Zn concentrations on growth and Zn tissue concentrations of a metal-accumulating aspen clone was examined in a dose-response study. Plants were grown in a soil with a low native Zn content which was spiked with Zn salt solutions and subsequently aged. Plant growth was not affected by NH(4)NO(3)-extractable soil Zn concentrations up to 60 microg Zn g(-1) soil, but it was completely inhibited at extractable concentrations above 90 microg Zn g(-1) soil. From these data an effective concentration of 68.5 microg extractable Zn g(-1) soil was calculated at which plant growth was reduced by 50%. The obtained information on toxicity threshold concentrations, and the relation between plant Zn accumulation and extractable soil Zn concentrations may be used to assess the suitability of the investigated Populus canescens clone for various phytoremediation strategies. The potential risk of metal transfer into food webs associated with P. canescens stands on Zn-polluted sites may also be estimated.
在一项剂量反应研究中，研究了增加土壤锌浓度对一种富金属白杨克隆体生长和锌组织浓度的影响。研究人员在一种锌含量较低的土壤中种植植物，并用锌盐溶液喷洒土壤，然后使其老化。在 NH(4)NO(3)-可提取土壤锌浓度高达 60 微克锌/克土壤的情况下，植物生长不受影响，但在可提取浓度高于 90 微克锌/克土壤时，植物生长完全受到抑制。根据这些数据，计算出有效浓度为 68.5 微克可提取锌/克土壤，此时植物生长减少了 50%。获得的毒性阈值浓度信息，以及植物锌积累与可提取土壤锌浓度之间的关系，可用于评估所研究的银白杨克隆体在各种植物修复策略中的适宜性。还可以估计与锌污染地点的银白杨林相关的金属转移到食物网中的潜在风险。
