Bleeker Eric A J, van Gestel Cornelis A M
Department of Animal Ecology, Institute of Ecological Science, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands.
Environ Pollut. 2007 Aug;148(3):824-32. doi: 10.1016/j.envpol.2007.01.034. Epub 2007 Mar 21.
Regarding impact on ecological soil functioning, metal pollution is often considered a constant factor for certain sampling sites. However, especially bioavailable concentrations may differ in space and time. This aspect was investigated on four sites along a metal-polluted river, differing in soil characteristics and metal concentrations. Every four weeks earthworm densities, soil characteristics, and metal concentrations in soil and earthworms were determined. Earthworm biomass and density fluctuated in time and increased with increasing metal contamination, indicating the presence of compensating factors. Multivariate analysis suggested organic matter and moisture content to be the main factors explaining earthworm biomass. Metal concentrations in the earthworms increased with increasing total or 0.01M CaCl(2) extractable soil concentrations, but no time-related trends were seen. Cadmium concentrations in the earthworms exceeded background values, suggesting a potential risk. The neutral red retention biomarker assay, however, did not show any signs of metal stress in the earthworms.
关于对生态土壤功能的影响，金属污染通常被认为是某些采样点的一个恒定因素。然而，特别是生物可利用浓度可能会随时间和空间而有所不同。在一条受金属污染河流沿线的四个土壤特性和金属浓度不同的地点对此进行了调查。每四周测定一次蚯蚓密度、土壤特性以及土壤和蚯蚓中的金属浓度。蚯蚓生物量和密度随时间波动，并随着金属污染程度的增加而增加，这表明存在补偿因素。多变量分析表明，有机质和水分含量是解释蚯蚓生物量的主要因素。蚯蚓体内的金属浓度随着土壤总浓度或0.01M氯化钙可提取土壤浓度的增加而增加，但未观察到与时间相关的趋势。蚯蚓体内的镉浓度超过了背景值，表明存在潜在风险。然而，中性红保留生物标志物检测未显示蚯蚓有任何金属应激迹象。
