 ISSN 0235-7224 ISSN 2029-0586 (online) |
2009 m. Nr. 1 Variation of carbon and metal concentration in soil amended with sewage sludge
Studies of metal impact on carbon cycle became more intense when the role of soil in climate change had emerged. This study aims at comparing changes in concentrations of soil carbon and Pb, Mn and Cd in soil amended with sewage sludge. The results indicate that mobile Pb, Mn and Cd concentrations have a higher correlation with soil carbon (r > 0.766; r > 0.768; r > 0.653 respectively, p > 0.01) than with the total soil metal contents (no significant correlation), which might be explained by the fact that mobile metals have more direct inhibitory effect on microorganism activity than total content. Significant correlation between mobile Mn, Pb, Cd and soil carbon shows their role in soil carbon cycle. Sewage sludge application on soil with an increased mobile metal fraction may lead to slower degradation of soil carbon and reduction of CO2 evolution. Keywords: mobile Pb, mobile Cd, mobile Mn, soil carbon, sewage sludge, forest soil |
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