Intra-annual stability of spatial and temporal niche complementarity in temperate grasslands

温带草原时空生态位互补性的年内稳定性

• 批准号: 172117761
• 负责人: Professorin Dr. Nina Buchmann
• 金额: --
• 依托单位: Institut für Agrarwissenschaften
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/172117761?language=en
• 关键词: Intra; annual; stability; spatial; temporal

Within Subproject Plant Water Relations (SP8), we will address complementary resource use, one of the potential mechanisms explaining biodiversity-ecosystem functioning relationships. We will focus on water and light use, since here major gaps in knowledge still exist, despite the relevance of both resources for plant performance. We aim to identify temporal niches for water sourcing at the species level and for the first time quantify plant water relations along a diversity gradient in the main experiment (block 2), complementing on-going efforts to partition ecosystem water fluxes (task 1). We will determine the ecophysiological mechanisms in terms of light and water use that are the basis for any spatio-temporal resource complementarity (in the tracer and Ecotron experiments) (task 2). In addition, we will assess the temporal development of light and water use niches, their biochemical basis and relevance for C and N allocation in the new species-specific trait experiment (task 3). Our measurements based on plant ecophysiology (e.g., leaf water potentials, leaf gas exchange rates) will be complemented by the assessment of water- and light-related plant traits (e.g., leaf morphology, carbon allocation, leaf greenness), canopy light profiles as well as stable oxygen and hydrogen isotope analyses of plant xylem and soil water. Based on these different approaches, we will collect a unique dataset on light, and in particular, on water use, to quantify niche complementarity and its development over time as well as to identify the underlying ecophysiological mechanisms.

在子项目植物-水关系（SP 8）中，我们将讨论补充资源利用，这是解释生物多样性-生态系统功能关系的潜在机制之一。我们将把重点放在水和光的使用，因为在这里仍然存在重大的知识差距，尽管这两种资源的相关性，植物的性能。我们的目标是确定时间生态位的水源在物种水平上，并首次量化植物水关系沿着多样性梯度的主要实验（块2），补充正在进行的努力，分区生态系统水通量（任务1）。我们将确定的光和水的使用方面的生态生理机制，是任何时空资源互补性的基础（在示踪剂和生态实验）（任务2）。此外，我们将评估的时间发展的光和水的利用生态位，其生化基础和相关性的C和N分配在新的物种特异性性状实验（任务3）。我们的测量基于植物生态生理学（例如，叶水势，叶气体交换率）将通过评估与水和光相关的植物性状（例如，叶形态、碳分配、叶绿度）、冠层光分布以及植物木质部和土壤水的稳定氧和氢同位素分析。基于这些不同的方法，我们将收集一个独特的光数据集，特别是水的使用，以量化生态位互补性及其随时间的发展，以及确定潜在的生态生理机制。