The Process and Mechanisms of Plant Competition in the Great Basin Sagebrush-Dominated Ecosystem

大盆地山艾树为主的生态系统植物竞争过程与机制

• 批准号: 8705492
• 负责人: Martyn Caldwell
• 金额: $ 117.95万
• 依托单位: Utah State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-07-15 至 1992-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8705492&HistoricalAwards=false
• 关键词: Process; Mechanisms; Plant; Competition; Great

This multi-investigator research project will address mechanisms of plant competition and their linkage with the process of competition and plant community development in the Great Basin sagebrush-dominated ecosystem. The research is based on manipulative field studies in replicated plots with extension to a landscape setting. Belowground competition is emphasized in four sets of hypotheses concerning (1) the occurrence, magnitude and significance of water leakage from roots and water transfer between plants -- experiments involving whole-plant gas exchange, soil psychrometry and time-domain reflectometry, stable isotopes, and root anatomy, (2) exploitation of resource-rich patches -- involving microscale root distributions, mycorrhizal dynamics, dual-isotope labeling, and root physiological properties, (3) characteristics of roots associated with competitive ability -- using indicator plant approaches with a broad germplasm resource, and (4) linking competition with plant fitness components such as seed output and seedling establishment -- using plant demographic and competition exclusion approaches. Additionally, a set of predictions extending these concepts to landscape situations will be tested. In all, 22 hypotheses and 4 predictions are posed and these range in scale from individual roots and associated mycorrhizae to community-level phenomena. The research team for this project is excellent and will undoubtedly maintain its pest productivity. Facilities provided by the institution for both field and laboratory positions of the project are first-class. A high level of scientific productivity can be expected to result.

这一多研究者研究项目将解决机制 植物竞争及其与植物生长过程的联系 大盆地的竞争和植物群落发展 蒿属植物为主的生态系统 这项研究是基于 在重复样地中进行的操作性田间研究， 一个风景布景。 强调地下竞争， 四组假设涉及（1）发生，规模 根系渗漏和水分运移的意义 在植物之间--包括整株植物气体交换的实验， 土壤湿度和时域反射仪，稳定同位素， 和根系解剖;（2）资源丰富的斑块的开发-- 包括微尺度根系分布，菌根动力学， 双同位素标记和根系生理特性;（3） 与竞争力相关的根的特征-- 使用具有广泛种质资源的指示植物方法， 以及（4）将竞争与植物适合度成分联系起来， 种子产量和幼苗建立-利用植物人口统计 和竞争排斥方法。 此外，一组 将这些概念扩展到景观情况的预测将 得到考验 总共提出了22个假设和4个预测， 这些范围从单个根和相关的 mycorbia到社区水平的现象。 该项目的研究团队非常优秀， 毫无疑问地保持其害虫生产力。 提供的设施 由该机构为外地和实验室的立场， 项目是一流的。 高水平的科学生产力 可以预期的结果。