The Significance of Nitrogen Uptake and Metabolism by Beech Roots for the Competition for Nitrogen in the Rhizosphere

山毛榉根系氮素吸收和代谢对根际氮素竞争的意义

• 批准号: 168309705
• 负责人: Professor Dr. Heinz Rennenberg
• 金额: --
• 依托单位: Professur für Baumphysiologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/168309705?language=en
• 关键词: Significance; Nitrogen; Uptake; Metabolism; Beech

This project is aimed (1) to quantify the uptake of inorganic and organic nitrogen sources by beech roots and to elucidate the competition between beech roots and soil microorganisms for these nitrogen sources, (2) to analyse the mechanisms of competition, and (3) to characterise their dependency on environmental factors, particularly on drought, in natural beech regeneration of nitrogen-limited, beech-dominated deciduous forests on calcarious soil. For this purpose, the physiological principles and patterns of competition between beech and soil microorganisms will be studied in experiments under field conditions and in the greenhouse. In the field, short-term and long-term consequences of differences in water availability will be analyzed in microcosms exchanged between a cool/moist (NE aspect) and a warm/dry (SW aspect) slope. Under controlled conditions, the significance of colonisation of beech roots with mycorrhizal fungi for the uptake of inorganic and organic nitrogen will be quantified at different levels of water availability and different temperatures. These studies include the determination of uptake rates and uptake kinetics of NH4+, NO3-, and amino compounds combined with N metabolite profiling in beech roots.

本项目的目的是(1)量化山毛榉根系对无机和有机氮源的吸收，并阐明山毛榉根系和土壤微生物对这些氮源的竞争；(2)分析竞争机制；(3)表征钙质土壤上以山毛榉为主的含氮量有限的落叶林天然山毛榉再生过程中对环境因素的依赖，特别是对干旱的依赖。为此，将在田间条件下和温室内的实验中研究山毛榉和土壤微生物之间的生理原理和竞争模式。在实地，将在凉爽/潮湿(东北方向)和温暖/干燥(西南方向)坡度之间交换的微观世界中分析可获得性差异的短期和长期后果。在受控条件下，在不同的可用水水平和不同的温度下，菌根真菌在山毛榉根部的定植对吸收无机和有机氮的意义将被量化。这些研究包括测定山毛榉根对NH4+、NO3-和氨基化合物的吸收速率和吸收动力学，并结合N代谢物谱分析。

项目成果

Natural regeneration of Fagus sylvatica L. adapts with maturation to warmer and drier microclimatic conditions

• DOI: 10.1016/j.foreco.2012.03.009
• 发表时间: 2012-07-01
• 期刊: FOREST ECOLOGY AND MANAGEMENT
• 影响因子: 3.7
• 作者: Bilela, Silvija;Dounavi, Aikaterini;Simon, Judy
• 通讯作者: Simon, Judy

Competition for nitrogen between adult European beech and its offspring is reduced by avoidance strategy

• DOI: 10.1016/j.foreco.2011.01.035
• 发表时间: 2011-07-15
• 期刊: FOREST ECOLOGY AND MANAGEMENT
• 影响因子: 3.7
• 作者: Simon, Judy;Dannenmann, Michael;Rennenberg, Heinz
• 通讯作者: Rennenberg, Heinz