Plant preference for NH4+ versus NO3- at different growth stages in an alpine agroecosystem

文献类型： 外文期刊

第一作者： Cui, Jihan

作者： Cui, Jihan;Yu, Chenqun;Qiao, Na;Xu, Xingliang;Ouyang, Hua;Cui, Jihan;Tian, Yuqiang

作者机构：

关键词： Ammonium;Nitrate;Growth stage;Plant functional group

期刊名称：FIELD CROPS RESEARCH （ 影响因子：5.224； 五年影响因子：6.19 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： It remains unclear if crops can change their preference for NH4+ or NO3- during their growth stages in alpine habits. Here, we conducted a field experiment using N-15-labelled NH4+ and NO3- to examine the preference for mineral N forms by four crop species (highland barley, forage oat, alfalfa and common vetch) at three growth stages in a Tibetan cropland. Twenty-four hours after N-15 labeling, plant and soil samples (0-15 cm) were collected for determining NH4+ and NO3+ as well as plant N content and its N-15/N-14 ratios. Soil NO3- concentration was significantly higher than NH4+ throughout the growth stages for legumes. For grasses, soil NH4+ concentration was higher than NO3- at early stages but lower at later stages. The N uptake efficiency (NUE) for alfalfa, forage oat, and common vetch decreased at the early stage, but increased later; for highland barley it decreased throughout the growth stage. The legumes preferred NO3- throughout their growth while the grasses preferred NH4+ at the early stages but switched the preference for NO3- later. We conclude that the crop N uptake preference can change during its different growing stages. (C) 2016 Elsevier B.V. All rights reserved.

分类号： S

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