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| Bone Char Restoration of Biological Activities in Soil and Plant Under Combined Heavy Metal Pollution |
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| KeyWord:combined Pb and Cd pollution; bone char; biological activity; plant enzymes; soil enzymes |
| Author Name | Affiliation | | GUO Rong-rong | College of Environment, Hohai University, Nanjing 210098, China | | YUAN Xu-yin | College of Environment, Hohai University, Nanjing 210098, China | | CHEN Hong-yan | College of Environment, Hohai University, Nanjing 210098, China | | LI Tian-yuan | College of Environment, Hohai University, Nanjing 210098, China | | ZHAO Xue-qiang | College of Environment, Hohai University, Nanjing 210098, China |
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| Abstract: |
| Bone char has shown to reduce the availability of heavy metals in soils, thus improving biological activities. Here a pot experiment was designed to explore the effects of bone char applications on biological activities in soil and plant under Pb and Cd combined pollution. Soil microbial biomass carbon, soil enzymes（urease, dehydrogenase, and acid phosphatase）, plant enzymes（peroxidase, catalase, malondialdehyde） of Brassica Campestris and plant dry biomass were measured at different times. The results showed that additions of bone char increased soil microbial biomass by 33%~46% as compared to the control. The enhancing effects of bone char on soil urease and dehydrogenase became smaller as incubation time increased. Dry biomass of Brassica campestris in bone char treatments was as 2.05~4.56 times much as that in the control. Plant catalase activity and malondialdehyde contents increased significantly in later incubation period. These results indicate that bone char could restore biological activities of polluted soil and increase the production of crops, with a better effectiveness in short term. Soil urease and dehydrogenase and plant malondialdehyde could be better indicators of restoration of combined-heavy metal polluted soil by bone char. |
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