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首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >Elevated Cd and Zn uptake by aspen limits the phytostabilization potential compared to five other tree species
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Elevated Cd and Zn uptake by aspen limits the phytostabilization potential compared to five other tree species

机译：与其他五种树种相比，白杨增加的Cd和Zn吸收限制了植物的稳定潜力

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摘要

Phytostabilization of metals using trees is often promoted, although the influence of different tree species on the mobilization of metals is not yet clear. This study examined effects of six tree species on the soil characteristics pH, organic carbon (OC) content and cation exchange capacity (CEC) and on the redistribution of cadmium (Cd) and zinc (Zn) on a polluted sandy soil. Soil and biomass were sampled in 10-year-old stands growing on former agricultural land. The tree species included were silver birch (Betula pendula), oak (Quercus robur and Quercus petraea), black locust (Robinia pseudoacacia), aspen (Populus tremula), Scots pine (Pinus sylvestris) and Douglas fir (Pseudotsuga menziesh). In the short period of 10 years, only aspen caused significant changes in the soil characteristics. Due to accumulation of Cd and Zn in its leaf litter, aspen increased the total as well as the NH4OAc-EDTA-extractable Cd and Zn concentrations in the topsoil compared to deeper soil layers and to other tree species. Also, topsoil pH, OC content and CEC were significantly higher than under most of the other species. This caused rather low 'bioavailable' CaCl2-extractable concentrations under aspen. Nevertheless, given the risks of aboveground metal dispersion and topsoil accumulation, it is recommended that aspen should be avoided when afforesting Cd and Zn contaminated lands.
机译：尽管尚不清楚不同树种对金属动员的影响，但通常促进使用树木对金属进行植物稳定化。这项研究检查了六种树种对土壤特征pH，有机碳（OC）含量和阳离子交换容量（CEC）以及镉（Cd）和锌（Zn）在污染的沙质土壤上的再分布的影响。土壤和生物量是在原农业土地上生长的10年生林分中取样的。包括的树种有白桦树（Betula pendula），橡树树（Quercus robur和Quercus petraea），刺槐树（Robinia pseudoacacia），白杨树（Populus tremula），苏格兰松树（Pinus sylvestris）和花旗松（Douglas fir）（Pseudotsuga menziesh）。在短短的10年中，仅白杨引起了土壤特性的显着变化。由于土壤垫层中Cd和Zn的积累，与更深的土壤层和其他树种相比，白杨增加了表层土壤中的总量以及NH4OAc-EDTA可提取的Cd和Zn浓度。而且，表土的pH值，OC含量和CEC均显着高于大多数其他物种。在白杨下，这导致相当低的“生物利用度” CaCl2可提取浓度。然而，考虑到地上金属分散和表土积聚的风险，建议在绿化Cd和Zn污染土地时应避免使用白杨。

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