Agronomy Department, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, Slovenia.
Chemosphere. 2013 Mar;91(1):1-6. doi: 10.1016/j.chemosphere.2012.11.011. Epub 2012 Dec 6.
Remediation soil is exposed to various environmental factors over time that can affect the final success of the operation. In the present study, we assessed Pb bioaccessibility and microbial activity in industrially polluted soil (Arnoldstein, Austria) stabilized with 5% (w/w) of Slovakite and 5% (w/w) of apatite soil after exposure to two earthworm species, Lumbricus terrestris and Dendrobaena veneta, used as model environmental biotic soil factors. Stabilization resulted in reduced Pb bioaccessibility, as assessed with one-step extraction tests and six-step sequential extraction, and improved soil functioning, mirrored in reduced β-glucosidase activity in soil. Both earthworm species increased Pb bioaccessibility, thus decreasing the initial stabilization efficacy and indicating the importance of considering the long-term fate of remediated soil. The earthworm species had different effects on soil enzyme activity, which can be attributed to species-specific microbial populations in earthworm gut acting on the ingested soil.
修复后的土壤会随着时间的推移而暴露在各种环境因素下，这些因素可能会影响修复作业的最终效果。在本研究中，我们评估了在两种用作环境生物土壤因子模型的蚯蚓（Lumbricus terrestris 和 Dendrobaena veneta）暴露后，用 5%（w/w）斯洛伐克石和 5%（w/w）磷灰石稳定的工业污染土壤（奥地利阿诺德斯泰因）中的 Pb 生物可利用性和微生物活性。稳定化处理降低了 Pb 的生物可利用性，这可以通过一步提取测试和六步连续提取来评估，并且改善了土壤功能，表现在土壤中β-葡萄糖苷酶活性降低。两种蚯蚓物种均增加了 Pb 的生物可利用性，从而降低了初始稳定化效果，这表明需要考虑修复后土壤的长期命运。蚯蚓物种对土壤酶活性有不同的影响，这可以归因于蚯蚓肠道中特定的微生物种群对摄入土壤的作用。
