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《Acta Prataculturae Sinica》 2009-02
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Nitrogen mineralization in alfalfa stands

HAN Fang-hu,SHEN Yu-ying,WANG Xi,ZHOU Shao-ping,YANG Jing,GENG Li-ying(College of Pastoral Agriculture Science and Technology,Key Laboratory of Grassland Agro-ecosystems,Lanzhou University,Lanzhou 730020,China)  
Greenhouse incubation experiments(12 weeks) were used to explore the influence of leaching initial mineral N,N fertilizers,and vegetation coverage on soil nitrogen mineralization of 5-and 9-year alfalfa(Medicago sativa) grasslands in the Qingyang Loess Plateau.The initial mineral N affected N mineralization and the net N mineralization rate increased by 0.05-0.07 mg/(kg·d) after the initial N was taken away.When N fertilization was adopted,the content of NO3——N in 5-and 9-year alfalfa grassland increased by 56 and 2 times respectively and net N mineralization rate increased by 200% in 5-year alfalfa grassland,but decreased by 62.5% in 9-year alfalfa grassland.Moreover,planting ryegrass(Lolium perenne) significantly affected N mineralization rate.For instance,net N mineralization rates in treatments with ryegrass were 12 to 18 times higher than in the control,and reached the highest values in the treatment N+Rye,where they were 18 to 25 times higher than in the controls.N mineralization potential in 9-year alfalfa stands was higher than in 5-year alfalfa.In grass-crop rotation systems on the Loess Plateau,succession plants should be sowed immediately after alfalfa is removed as dense plant coverage should reduce the risk of losing NO3-and thus enhance N availability in the rainy season.
【Fund】: 973项目(2007CB106804);; 澳大利亚国际农业中心项目(LWR2/1999/094);; 中澳政府间科技合作项目(2005DFA30030-6);; 农业部草地农业生态系统学重点实验室资助
【CateGory Index】: S541.9
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