Dissertation Research: Constraints on Invasion by a Nitrogen-fixing Woody Shrub and Consequences for Resident Grassland Species

论文研究：固氮木本灌木入侵的限制及其对常驻草原物种的影响

• 批准号: 0073068
• 负责人: Carla D'Antonio
• 金额: $ 0.72万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-06-15 至 2002-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0073068&HistoricalAwards=false
• 关键词: Dissertation; Research; Constraints; Invasion; Nitrogen

0073068D'AntonioInvasions by wood shrubs (particularly those that fix nitrogen) into grasslands have received much attention, yet we do not understand the role that N-fixation plays in the invasion process. In particular, we do not know what constraints may be imposed by soil-borne mutualists on fixation efficiency, nor the degree to which nutrient limitation of the resident community contributes to the competitive advantage of N-fixation. This research will investigate three questions that address constraints on a nitrogen-fixing shrub's ability to invade a coastal California grassland habitat, and the consequences of that fixation for resident species interactions: (1) How does the success of colonization by broom into grassland habitat change with nutrient limitation of the resident species? (2) How does availability or quality of Rhizobium innoculum affect this species" ability to invade and fix nitrogen? (3) How does enrichment of soil by N-fixation affect species interactions? Coastal California grasslands offer an ideal opportunity to perform this research because they lack a significant native N-fixing component, are themselves nitrogen limited, and are currently experiencing dramatic invasions by several introduced N-fixing shrubs.

0073068D'Antonio摄影（尤其是那些将氮）（尤其是将氮）固定到草原上的二芳族，但我们不了解N固定物在入侵过程中的作用。 特别是，我们不知道土壤传播者对固定效率可能施加哪些限制，也不知道居民社区的营养限制对N固定的竞争优势有助于。 这项研究将调查三个问题，这些问题解决了限制氮灌木侵入加利福尼亚州草原栖息地的能力的限制，以及该固定物对居民物种相互作用的后果：（1）扫帚栖息地殖民到草原栖息地的成功与居民养分限制的变化如何？ （2）innoculum的可用性或质量如何影响这种物种“入侵和固定氮的能力？（3）通过n固定的富集土壤会影响物种相互作用？沿海加利福尼亚草原提供了进行这项研究的理想机会来进行这项研究，因为它们缺乏本身的NININITROGON INNITROGEN LIMIMIDERS INTRAUB，并介绍了dram ind franem dram ind inm dram ind franem dram ind franem dram ind franm dram。