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《Journal of Anhui Agricultural Sciences》 2010-12
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Effects of Cadmium on Growth,Nodulation and Nitrogen Fixation of Alfalfa(Medicago Sativa)

CI En et al(College of Resources and Environment,Southwest University,Chongqing 400716)  
[Objective] The research aimed to study the effects of cadmium on growth,nodulation and nitrogen fixation of Medicago sativa.[Method] The pot experiment was used.[Result] The results showed that there was little effects of cadmium on aboveground biomass,height and chlorophyll content of Medicago sativa in treatments with low cadmium addition.Effects of cadmium on aboveground biomass was significant in treatment with cadmiumaddition of 10.0 mg/kg soil,and growth and chlorophyll synthesis of Medicago sativa were significantly restrained in treatment with cadmiumaddition of 50.0 mg/kg soil.The distribution of cadmium content in Medicago sativa could be sequenced as:Rootaboveground part.Cadmium content in different parts of Medicago sativa had significantly positive relation to cadmium addition in the soil(P0.01).Average fresh weight of root nodule in different pots declined along with increase of cadmium addition in treatments.Nitrogenase activity in the treatment began to be significantly restrained when cadmium of 5.0 mg/kg soil was added into the soil.[Conclusion] The study implied that Medicago sativa and N-fixing symbiosis had certain tolerance to cadmium pollution,and cadmiumof higher content in soil would induce cadmiumcontent in aboveground part of Medicago sativa exceed standard,and restrained the growth and nitrogen fixation of Medicago sativa.
【Fund】: 中国博士后科学基金项目(20090460716);; 重庆市自然科学基金项目(CSTC 2009BB1108);; ;国家科技支撑计划项目(2007BAD87B10 2008BABA7B09);; 中央高校基本科研业务费专项基金项目(XDJK2009C060)
【CateGory Index】: S541.9
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