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| Characteristics and Cd fractions of rhizospheric soil of Amaranthus hybridus L. under different cadmium concentrations |
| Received:October 14, 2015 |
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| KeyWord:rhizosphere;DOC;Cd fraction;soil enzyme activities |
| Author Name | Affiliation | E-mail | | DENG Yu-lan | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | XU Xiao-xun | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | Xuxiaoxun2013@163.com | | ZHANG Shi-rong | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | PU Yu-lin | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | ZHANG Chi-qiang | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | HUO Qing-lin | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | DONG Yuan-yuan | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | |
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| Abstract: |
| Amaranthus hybridus L. is Cd-tolerant plant. Here a pot experiment was carried out to investigate the effects of cadmium(Cd)stresses on the characteristics and Cd fractions of A. hybridus rhizospheric soil. Results showed that pH in the rhizospheric soil was lower than that in non-rhizospheric soil, while dissolved organic carbon(DOC) concentrations and catalase, urease and phosphatase activities were just opposite. Increasing Cd concentrations reduced pH and catalase activity, but increased DOC concentrations. With Cd concentrations increasing, exchangeable Cd fraction was increased, while iron and manganese oxides bound Cd fraction was decreased initially but increased later. Carbonates bound, organic matter bound and residual Cd fractions were all decreased. These results suggest that pH and DOC in rhizospheric soil of A. hybridus could be an important factor influencing the distribution of Cd fractions, and enzymatic activities in the rhizospheric soil could play a role in mitigating Cd toxicity. |
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