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《Ecology and Environmental Sciences》 2009-05
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Effects of phosphorus on aluminum forms and soil enzymatic activities of buckwheat rhizosphere under aluminum stress

XING Chenghua1,ZHU Meihong2,ZHANG Shuna2,LI Fang2,CAI Miaozhen2,WANG Zengji2 1. Agriculture and Bioengineering Institute,Jinhua College of Profession and Technolog,Jinhua 321007,China; 2.College of Chemistry and Life Sciences,Zhejiang Normal University,Jinhua 321004,China  
Two different Al tolerence buckwheat that were Neimeng(Al tolerant) and Jiangxi (Al sensitive) were compared under aluminum stress. The effects of P on buckwheat growth,Al forms and soil enzymatic activities of root rhizosphere microecology under Al toxicity were studied by using methods of soil culture. The results revealed that the biomass of Neimeng and Jiangxi buck-wheat supplied with 0.2 g·kg-1 P and 0.4 g·kg-1Al were 67.9% and 21.2% higher than that supplied without P. P could ameliorate the inhibition of Al on root elongation,enhance the root biomass and root-to-shoot ratio. P and Al interaction significantly decreased both exchangeable Al (ExAl),while increased hydroxyl Al (HyAl) and organically complexed Al (OrAl) content of rhizosphere soil that were low toxicity. Changes of soil enzyme activities in Rhizosphere was complexity. Catalase activities showed positive correlation with P. 0.2 g·kg-1 P was the most convenient concentration for catalase activities. These results indicated that P application may alleviate Al toxicity by decreasing ExAl content and enhancing catalase activity of rhizosphere soil.
【Fund】: 国家自然科学基金项目(30800705);; 浙江省自然科学基金项目(Y307535;Y304185);; 浙江省教育厅科研计划项目(Y200804870)
【CateGory Index】: S517
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