期刊
AGRONOMIE
卷 23, 期 5-6, 页码 503-510出版社
EDP SCIENCES S A
DOI: 10.1051/agro:2003022
关键词
mixed culture; exudation; ammonium; amino acid
类别
The nitrogen isotope N-15 was used to quantify and determine the direction of nitrogen transfer between white clover ( Trifolium repens L.) and perennial ryegrass ( Lolium perenne L.). A micro-lysimeter system allowed the determination of the nature of the compounds exuded. During N privation, transfer was one-way from clover to ryegrass and was mainly explained by the large amounts of ammonium exuded by clover. N compound exudation by legume followed by uptake by companion grass is a highly significant pathway for inter-specific N transfer between young plants. Ammonium was the major N compound exuded. Amino acids were released in lower amounts, serine and glycine being the most abundant in leachates. In the micro-lysimeter, the amounts of ammonium, serine and glycine in the exudate were not altered by the presence of bacteria, providing evidence of the plant origin of these compounds.
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