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| Effects of biochars derived from chicken manure and rape straw on soil properties and lead form transformation in a lead-contaminated light sierozem |
| Received:October 08, 2015 |
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| KeyWord:lead;light sierozem;biochar;soil property;heavy metal form |
| Author Name | Affiliation | E-mail | | XU Ren-zhi | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | | ZHAO Bao-wei | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | baoweizhao@mail.lzjtu.cn | | MA Feng-feng | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | | LI Ye-wei | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | | WANG Lu | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | |
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| Abstract: |
| This study was to assess the impacts of biochars on soil properties and lead form transformation of lead-contaminated light sierozem. Biochars were prepared from chicken manure(CBC) and rape straw(RBC). Correlation between soil properties and lead form transformation was examined using Stepwise Regression Analysis. Applications of biochars transformed lead into stable forms. At biochar rate of 15%, acid extractable lead decreased by 17.04% for CBC and 12.3% for RBC, as compared with the control. Lead immobilization was more obvious at RBC less than 10% or at CBC higher than 10%. The additions of biochars significantly increased soil pH values by up to 11.36% in CBC-soil and 10.99% in RBC-soil and organic matter content by up to 419.13% in CBC-soil and 1334.56% in RBC-soil, which largely influenced the transformation of lead forms. In addition, elevated content of carbonates(the maximum increment of 6.7%) by CBC addition also influenced the lead transformation. However, too high soil pH might lead to reduction in soil quality. Therefore, it is recommended that biochar application rates should be less than 10% for RBC and less than 5% for CBC. |
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