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Transfer of Symbiotically Fixed Nitrogen in an Alfalfa-Grass Mixture Studied Through Isotope Dilution in a Pot Experiment

 

作者: H. Beschow,   J. Schulze,   W. Merbach,  

 

期刊: Isotopes in Environmental and Health Studies  (Taylor Available online 2000)
卷期: Volume 36, issue 1  

页码: 21-33

 

ISSN:1025-6016

 

年代: 2000

 

DOI:10.1080/10256010008032930

 

出版商: Taylor & Francis Group

 

关键词: Alfalfa-grass mixture;isotope dilution;nitrogen15;N2fixation;N transfer

 

数据来源: Taylor

 

摘要:

The nitrogen transfer between alfalfa and ryegrass was studied through isotope dilution at three different levels of N fertilization (20 mg N/pot, 200 mg N/pot, 400 mg N/pot) in a pot experiment using quartz sand as a substrate. An isogenic, nodulating, but non nitrogen fixing alfalfa line was used as a reference crop. Fixed N was transferred to the grass in the 20 mg N treatment and contributed markedly to the N nutrition of the grass (about 50% of the N in the plants). No transfer of fixed N could be detected in the higher fertilized treatments, although nitrogen fixation was only slightly inhibited by the presence of the fertilized mineral N. It is concluded that N transfer is strongly influenced by the N concentration in the substrate and transferred N contributes only slightly to the productivity of the legume/grass mixture under the given experimental conditions.

 

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