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Effects of water and nitrogen availability on nitrogen contribution by the legume, Lupinus argenteus Pursh

机译：水分和氮素利用率对豆科植物羽扇豆氮素贡献的影响

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摘要

Nitrogen-fixing species contribute to ecosystem nitrogen budgets, but background resource levels influence nodulation, fixation, and plant growth. We conducted a greenhouse experiment to examine the separate and interacting effects of water and N availability on biomass production, tissue N concentration, nodulation, nodule activity, and rhizodeposition of Lupinus argenteus (Pursh), a legume native to sagebrush steppe. Plants were grown in a replicated, randomized design with three levels of water and four levels of N. Additional water and N increased biomass except at the highest N level. All plants formed nodules regardless of treatment, but plants grown without N had the largest, most active nodules. Organic N was deposited into the rhizosphere of all plants, regardless of treatment, indicating that Lupinus can influence N availability while actively growing, even under water stress. High tissue N concentrations and low C:N ratios indicate that Lupinus also can provide substantial amounts of N through litter decomposition. The ability of Lupinus to affect N availability and cycling indicates that it has the potential to significantly influence N budgets and community composition within the sagebrush steppe.
机译：固氮物种为生态系统的氮预算做出了贡献，但背景资源水平影响结瘤，固着和植物生长。我们进行了一个温室实验，以研究水和氮的有效利用对鼠尾草草原豆科植物羽扇豆（Pursh）的生物量产生，组织氮浓度，结瘤，结节活性和根状沉积的单独和相互作用的影响。植物以重复，随机的设计生长，其中包含三个水平的水和四个水平的N。额外的水和N增加了生物量，但最高N水平除外。无论处理如何，所有植物均形成根瘤，但无氮生长的植物具有最大，最活跃的根瘤。无论处理如何，有机氮都会沉积到所有植物的根际中，这表明羽扇豆即使在水分胁迫下也可以在积极生长的同时影响氮的有效性。高的组织氮浓度和低的C：N比值​​表明羽扇豆还可以通过凋落物分解提供大量的氮。羽扇豆影响氮素供应和循环的能力表明它有可能显着影响鼠尾草草原中氮素的预算和群落组成。

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