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| Effects of biochar on carbon metabolic capacity and functional diversity of soil microbial communities under Cd contamination |
| Received:December 28, 2015 |
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| KeyWord:biochar;heavy metal;Cd;microbial functional diversity;Biolog |
| Author Name | Affiliation | E-mail | | ZHANG Xiu | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | SHANG Yi-jie | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | XIA Yun-sheng | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZHAO Qing-qing | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | SHI Jing | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | 383110966@qq.com |
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| Abstract: |
| Cadmium (Cd) contamination in farmland ecosystems has become more and more serious. Biochar (BC) are known to bind heavy metals. Whether BC affects the functional diversity of soil microbial communities in Cd-contaminated soil is unclear. Here a pot experiment was designed to investigate the effects of BC on carbon metabolic capacity and functional diversity of soil microbial communities in Cd contaminated soil, using Biolog-Eco micro plate. Application rates of BC were 0%, 2.5%, and 10% (W/W). The AWCD (average well color development) values, diversity index, carbon source utilization characteristics, and the principal component analysis results all showed that though the degree to which the soil microbes in four treatments used carbon sources was different, applying BC generally improved carbon metabolic activity and functional diversity of microbial communities in Cd contaminated soil, with 2.5% BC having the greatest effects. Compared with the control, McIntosh index of soil microbes was increased by 70.59% and the uniform degree of the species in the coenosis experienced huge changes. The utilization ability of carboxylic acid and amino acid carbon source compounds was increased by 10 times and 5 times, respectively. However, such utilization ability of carboxylic acid and saccharide carbon source compounds was increased at low rates of BCs (2.5%) ; while that of amino acid carbon source compounds was elevated at high concentration of BCs (10%). The difference be tween two BC treatment groups and the control treatment group was mainly caused by carboxylic acid, polymer and other carbon source com pounds. |
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