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| Effects of straw biochar on rhizospheric enzyme activities in Cd contaminated paddy soil |
| Received:December 24, 2015 |
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| KeyWord:biochar;rice;rhizospheric soil;soil carbon cycle enzyme;soil redox enzyme |
| Author Name | Affiliation | E-mail | | SHANG Yi-jie | Yunnan Agriculture University, College of Resource and Environment, Kunming 650201, China | | | ZHANG Xiu | Yunnan Agriculture University, College of Resource and Environment, Kunming 650201, China | | | WANG Hai-bo | Yunnan Agriculture University, College of Resource and Environment, Kunming 650201, China | | | SHI Jing | Yunnan Agriculture University, College of Resource and Environment, Kunming 650201, China | 383110966@qq.com |
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| Abstract: |
| Biochar may reduce heavy metal bioavailability in soils through enhancing adsorption and thus modifies enzymatic activities in polluted soils. Here an experiment was conducted to explore the effects of biochar additions on activities of redox enzymes and carbon cycle enzymes in the rhizosphere of rice under different cadmium(Cd) pollution. Results showed that under different treatments the comprehensive value of carbon cycle enzyme activities varied between 1.388 and 12.029 in the rhizospheric soil, while from 0.542 to 1.713 in non-rhizospheric soil. The composite value of redox enzyme activities in the rhizospheric soil of rice was in the range of 0.387 to 1.627, but from 0.167 to 1.201 in the non-rhizospheric soil of rice. The activities of both redox enzyme and carbon cycle enzyme in the rhizospheric soil of rice were higher than those in non-rhizospheric soil. At 10% of biochar addition and 2.5 mg·kg-1 of Cd content, the activities of carbon cycle enzyme and redox enzyme in the rhizospheric soil were 12.029, and 1.192, respectively, which were the highest. Therefore, this rate of biochar has a remarkable enhancing effect on activities of these two enzymes. |
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