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Copper mobility and toxicity of soil percolation water to bacteria in a metal polluted forest soil

机译：铜的迁移率和土壤渗透水对金属污染的森林土壤中细菌的毒性

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摘要

In order to assess the success of in situ remediation of coniferous forest soil polluted by a Cu–Ni smelter, the total Cu concentration in soil percolation water, the fluxes of Cu down through the soil profile, and the toxicity of soil percolation water to soil bacteria were studied. Total Cu in percolation water was also fractionated into free ionic and complexed forms. The toxicity of the percolation water was measured by the [3H]-thymidine incorporation method, which measures bacterial growth rates. Soil percolation water was collected during one growing season by zero tension lysimeters inserted at depths of 0.2 and 0.4 m in the soil. The treatments consisted of a control, mulch application to the forest floor (M) and mulch application after removing the polluted organic soil layer (MR). The mulch consisted of a mixture of compost and woodchips (1/1; vol/vol). Analysis of Cu species and dissolved organic carbon (DOC) indicated that DOC leached from the mulch and complexed Cu into forms that were less toxic to soil bacteria. At 0.2 m depth percolation water toxicity was 19% lower in the M and 42% lower in the MR treatment than in the control. Toxicity correlated with the Cu2+ concentration, which was 61 and 84% lower in the M and MR treatments, respectively, compared to the control. However, there were signs that total Cu had leached down through the soil profile, the leaching being more pronounced in the MR treatment.
机译：为了评估原位修复被Cu-Ni冶炼厂污染的针叶林土壤，土壤渗滤水中的总Cu浓度，穿过土壤剖面的Cu通量以及土壤渗滤水对土壤的毒性的成功程度，对细菌进行了研究。渗滤水中的总铜也被分离成游离离子形式和络合形式。通过[3 H]-胸苷掺入法测定渗滤水的毒性，该方法可测量细菌的生长速率。在一个生长季节，通过在土壤中插入0.2和0.4 m深度的零张力测井仪收集土壤渗滤水。处理包括控制，覆盖森林地面（M）和去除污染的有机土壤层（MR）之后的覆盖物。覆盖物由堆肥和木片（1/1；体积/体积）的混合物组成。对铜的种类和溶解的有机碳（DOC）的分析表明，DOC从地膜中浸出并与铜络合成对土壤细菌毒性较小的形式。在深度为0.2 m时，渗滤水的M毒性比MR处理低19％，MR处理的毒性比对照低42％。毒性与Cu2 +浓度有关，与对照组相比，M和MR处理分别降低了61％和84％。但是，有迹象表明，总铜已经从土壤剖面中渗出，这种渗出在MR处理中更为明显。

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