Murray P, Ge Y, Hendershot W H
Department of Natural Resource Sciences, Macdonald Campus, McGill University, Ste-Anne-de-Bellevue, Québec, Canada H9X 3V9.
Environ Pollut. 2000 Jan;107(1):127-35. doi: 10.1016/s0269-7491(99)00120-7.
Selecting guidelines to evaluate elevated metals in urban brownfields is hindered by the lack of information for these sites on ecosystem structure and function. A study was performed to compare three trace metal-contaminated sites in the metropolitan Montreal area. The goal was to obtain an idea of the organisms that may be present on urban brownfields and to measure if elevated metals alter the presence and activity of the indigenous biota. Field and laboratory studies were conducted using simple methodologies to determine the extent to which microbial activity affected by trace metal content, to assess diversity of plant and soil invertebrate communities and to measure phytoaccumulation of trace metals. It was found that microbial activity, as measured by substrate-induced respiration (SIR) and nitrification, was not affected by the levels of soil Cd, Cu, Ni, Pb and Zn recorded on the sites. Seven of the 12 invertebrate groups collected were sampled on soils with similar Cd, Cu, Ni, Pb and Zn concentrations. Diversity of plant species increased as a function of the length of time the sites had been inactive. Levels of metals in plant tissue were influenced by soil characteristics and not by total soil Cd, Cu, Ni, Pb and Zn.
由于缺乏城市棕地生态系统结构和功能方面的信息，难以选择评估城市棕地中金属含量升高情况的指导方针。开展了一项研究，对蒙特利尔市区的三个痕量金属污染场地进行比较。目的是了解城市棕地可能存在的生物，并测定金属含量升高是否会改变本地生物群的存在和活动。通过简单方法进行了实地和实验室研究，以确定痕量金属含量对微生物活动的影响程度，评估植物和土壤无脊椎动物群落的多样性，并测定痕量金属的植物积累情况。研究发现，通过底物诱导呼吸（SIR）和硝化作用测定的微生物活动，不受场地记录的土壤镉、铜、镍、铅和锌含量水平的影响。所采集的12个无脊椎动物类群中有7个是在镉、铜、镍、铅和锌浓度相似的土壤中取样的。植物物种多样性随着场地闲置时间的延长而增加。植物组织中的金属含量受土壤特性影响，而非受土壤镉、铜、镍、铅和锌总量影响。
