期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 73, 期 -, 页码 10-21出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2014.02.005
关键词
Legume N; N transfer; N-15 isotope dilution; N-15(2); N-15 shoot-labelling; Split-root technique
类别
资金
- CSIRO
Methodologies based on N-15-enrichment for estimating the transfer of nitrogen (N) between legumes and companion non-legume species in agro-ecosystems are critically reviewed and classified according to whether they (i) are direct or indirect (ii) are dependent or independent of the measurement of yield and (iii) are estimating transfer of legume N, biologically-fixed legume N, or non-legume N. The two most commonly used methods are the indirect N-15 isotope dilution method and the direct 15N shoot-labelling method. Published estimates both within and between agro-ecosystems are very variable, ranging from 0 to >50% of the N present in a companion species estimated to have been derived from a companion legume. The transfer of N also occurs from companion species to legumes, but is generally much less than the opposite flux. Factors conducive to N transfer include inter alia species proximity (i.e. intimacy of root contact), legume pruning, defoliation or death and the length of the transfer period. It was concluded that two methodologies (N-15(2) exposure and the split-root technique) lack field applicability. New insights into the various mechanisms of N transfer in agro-ecosystems may assist in the selection or development of more appropriate methodologies for estimating N transfer by both above- and below-ground pathways. Crown Copyright (c) 2014 Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据