Diversity Maintenance in Variable Environments: Multiple Mechanisms at Multiple Scales

多变环境下的多样性维持：多尺度的多种机制

• 批准号: 9307658
• 负责人: Nancy Huntly
• 金额: $ 32.5万
• 依托单位: Idaho State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-07-15 至 1997-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9307658&HistoricalAwards=false
• 关键词: Diversity; Maintenance; Variable; Environments; Multiple

9307658 Huntly This research combines theory and experiments to define and measure the mechanisms by which fluctuating environmental factors (e.g., temporal variation in weather patterns, spatial variation in soil water or nitrogen content) influence coexistence, using desert annual plants of the Chihuahuan Desert as a test case. The PI's will focus on an integrated examination of effects of environmental variability at several temporal scales, both within and between years, and on simultaneous measurements of the effects of several different mechanisms of coexistence, two being dependent on variable environmental conditions and one being classical niche differences. The PI's combine development of models of germination and growth of desert annual plants with field and laboratory experiments designed to measure responses of plants to within- and among-year patterns of temperature and resource availability, and to detect non-linear competitive interactions. %%% A sound understanding of the role of environmental variability in the dynamics and diversity of communities is needed, as is a framework for understanding the contributions of multiple factors to species coexistence. This research will provide a better understanding of species coexistence in variable environments mediated by multiple interactions, and increase our understanding of the ecology and coexistence of desert annual plants. ***

9307658 Huntly 这项研究结合了理论和实验，以奇瓦瓦沙漠的沙漠一年生植物作为测试案例，定义和测量波动的环境因素（例如天气模式的时间变化、土壤水或氮含量的空间变化）影响共存的机制。 PI将侧重于对几年内和不同时间范围内环境变化的影响进行综合检查，并同时测量几种不同共存机制的影响，其中两种机制取决于可变的环境条件，另一种是经典的生态位差异。该PI将沙漠一年生植物发芽和生长模型的开发与旨在测量植物对年内和年内温度和资源可用性模式的响应的实地和实验室实验相结合，并检测非线性竞争相互作用。 %%% 需要充分了解环境变化在群落动态和多样性中的作用，以及理解多种因素对物种共存的贡献的框架。这项研究将有助于更好地理解多种相互作用介导的多变环境中的物种共存，并增加我们对沙漠一年生植物生态和共存的理解。 ***