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| Effects of Nitrogen Forms on Growth and Zn/Cd Uptake of Sedum Plumbizincicola |
| Received:April 27, 2014 |
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| KeyWord:nitrogen forms;Sedum plumbizincicola;Zn and Cd;plant uptake |
| Author Name | Affiliation | E-mail | | WANG Jie | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
Chinese Academy of Sciences, Beijing 100049, China | | | SHEN Li-bo | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | LI Zhu | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | WU Long-hua | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | lhwu@issas.ac.cn | | LUO Yong-ming | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China | |
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| Abstract: |
| Different forms of nitrogen affect not only plant growth and metabolism, but also heavy metal absorption by plants. A pot experiment was conducted to study the effects of different nitrogen forms(either NO3- or NH4+) on soil solution Zn and Cd concentrations in rhizospheric and bulk soils, and biomass and Zn and Cd uptake of metal hyperaccumulator Sedum plumbizincicola using a unilateral root bag method. Application of NO3- increased bio-availability of Zn and Cd in rhizospheric soil and thus the concentrations of Zn and Cd in Sedum plumbizincicola. In NO3- treatment, plant Zn and Cd concentrations were respectively 38.2% and 110% greater than the control. However, NH4+ treatment had no effects on bioavailability and plant concentrations of Zn and Cd, but enhanced plant biomass by 49.4%. Different nitrogen forms showed greater effects on the biomass than on plant Zn and Cd concentrations. Treatment with NH4+ significantly increased total amount of plant Zn and Cd uptake by 53.3% and 123%, respectively, but NO3- did not. These results indicate that applying ammonium fertilizer would enhance phytoextraction efficiency of Zn and Cd contaminated soils by Sedum plumbizincicola. |
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