CRB: Understanding the Regional Distribution of Native Meadow Remnants in Northern California

CRB：了解北加州原生草甸遗迹的区域分布

• 批准号: 9903421
• 负责人: Susan Harrison
• 金额: $ 15万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-07-15 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9903421&HistoricalAwards=false
• 关键词: CRB; Understanding; Regional; Distribution; Native

9903421HarrisonUnderstanding the nature of refugia for native species in heavily invaded communities is both a scientific challenge and a conservation necessity. For example, California meadow communities are largely dominated by alien annual plants; remnant native species still persist, but there is a lack of quantitative knowledge of where they persist and why. Like many questions in ecology, this one must be addressed at a large spatial scale. This research will determine how soils, topography, land use and spatial isolation interact to affect the distribution of native meadow plants in a 130,000 hectare region of northern California. Two main hypotheses will be tested: (1) The distribution of native diversity is predictable at a regional scale, and (2) native species diversity depends on invasibility and isolation. The first hypotheses will be address by a carefully designed, stratified sampling regime. The second hypothesis will be addressed by highly controlled manipulative experiments. This project will be one of the first attempts to quantify patterns of native and alien species diversity at a regional scale, in a highly invaded terrestrial community. It will also be one of the first studies to examine the role of spatial isolation in creating refugia for native species. Finally, it is designed to contribute to an ecosystem management effort that is currently underway in the study region.

9903421HarrisonUnderstanding the nature of refugia for native species in heavily invasive communities is both a scientific challenge and a conservation necessary.例如，加州草地群落主要由外来一年生植物占主导地位;残余的本土物种仍然存在，但缺乏关于它们存在的位置和原因的定量知识。像生态学中的许多问题一样，这个问题必须在大的空间尺度上解决。这项研究将确定土壤，地形，土地利用和空间隔离如何相互作用，影响本地草甸植物在北方加州130,000公顷地区的分布。两个主要假设将被测试：（1）本地多样性的分布是可预测的，在区域范围内，（2）本地物种多样性取决于入侵和隔离。第一个假设将通过精心设计的分层抽样制度来解决。第二个假设将通过高度控制的操纵实验来解决。该项目将是在一个高度入侵的陆地社区中，在区域范围内量化本地和外来物种多样性模式的首批尝试之一。这也将是第一批研究空间隔离在为本地物种创造避难所方面的作用的研究之一。最后，它的目的是促进生态系统管理的努力，目前正在研究区域。