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Environmental effects of heavy metal accumulation in urban soilsby application of Biolog method

YANG Yuan gen1, E. Paterson2, C. Campbell2(1. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002,China; 2. The Macaulay Land Use Research Institute, Aberdeen, UK AB15 8QH)  
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.
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