用微生物对单一碳源利用方法探讨重金属在城市土壤中积累的环境效应

Biolog研究表明，英国阿伯丁市城市土壤的微生物群落结构显著有别于农村土壤，并使微生物对碳源的消耗量增加，消耗速度加快。城市土壤中不仅重金属Cu,Pb,Zn,Ni的含量明显高于农村土壤，而且其化学形态的主成分分析表明，有效态Pb,Zn,Cu及有机态Ni和Cu是导致城市土壤区分于农村土壤的主要因子。相关性分析表明，Biolog的这种变化规律与重金属的上述化学形态密切相关；典型变量分析表明，重金属对城市土壤微生物群落结果的这种损伤具有长期性效应及不可恢复性。

Environmental effects of heavy metal accumulation in urban soils by application of Biolog method

Biolog method was applied for microbial community and functional diversity studies in soils in and around Aberdeen city. The results show that an obvious shift in microbial communities and functional diversities can be observedin urban soils compared with rural soils under the press of heavy metal accumulation in urban environment, which lead to much more microbial consumption of carbon sources and faster in consumption rates in urban soils than that in rural soils. Urban soils possess high contents of heavy metals, and soluble Pb, Zn, Cu and organic Ni, Cu are the main factors to distinguish rural soils, as deduced from principal component analysis of heavy metal chemical forms. Correlation analyses give the results that variance of Biolog couples with above chemical forms of heavy metals; canonical variate loadings of Biolog data release that the harmful effects of heavy metals on urban soil microbial communities are extended and unrecoverable.