Soil Research Centre, Department of Geography and Environmental Science, School of Human and Environmental Sciences, University of Reading, Whiteknights, Reading, RG6 6DW, UK.
Environ Pollut. 2011 Jul;159(7):1852-60. doi: 10.1016/j.envpol.2011.03.024. Epub 2011 Apr 17.
The common practice of remediating metal contaminated mine soils with compost can reduce metal mobility and promote revegetation, but the effect of introduced or colonising earthworms on metal solubility is largely unknown. We amended soils from an As/Cu (1150 mg As kg(-1) and 362 mg Cu kg(-1)) and Pb/Zn mine (4550 mg Pb kg(-1) and 908 mg Zn kg(-1)) with 0, 5, 10, 15 and 20% compost and then introduced Lumbricus terrestris. Porewater was sampled and soil extracted with water to determine trace element solubility, pH and soluble organic carbon. Compost reduced Cu, Pb and Zn, but increased As solubility. Earthworms decreased water soluble Cu and As but increased Pb and Zn in porewater. The effect of the earthworms decreased with increasing compost amendment. The impact of the compost and the earthworms on metal solubility is explained by their effect on pH and soluble organic carbon and the environmental chemistry of each element.
用堆肥修复受金属污染的矿山土壤是一种常见的做法，它可以降低金属的迁移性并促进植被的恢复，但引入或定植的蚯蚓对金属溶解度的影响在很大程度上尚不清楚。我们用 0、5、10、15 和 20%的堆肥来改良砷/铜（1150 毫克砷/千克和 362 毫克铜/千克）和铅/锌矿（4550 毫克铅/千克和 908 毫克锌/千克）的土壤，然后引入赤子爱胜蚓。采集孔隙水并用去离子水提取土壤以确定微量元素的溶解度、pH 值和可溶性有机碳。堆肥降低了铜、铅和锌的含量，但增加了砷的溶解度。蚯蚓降低了水中的铜和砷的溶解度，但增加了孔隙水中的铅和锌的溶解度。随着堆肥添加量的增加，蚯蚓的作用会降低。堆肥和蚯蚓对金属溶解度的影响可以用它们对 pH 值和可溶性有机碳的影响以及每个元素的环境化学来解释。
