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Climate and Competition as Controls on the Persistence and Richness of an Edaphicendemic Flora

气候和竞争对土壤流行植物群的持久性和丰富度的控制

基本信息

批准号：
0542451
负责人：
Susan Harrison
金额：
--
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：
2006
资助国家：
美国
起止时间：
2006-04-01 至 2011-03-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0542451&HistoricalAwards=false
关键词：
Climate Competition Controls Persistence Richness

项目摘要

Scientists currently know little about how global climate change will affect edaphic endemics, or plants that are confined to certain unusual rocks or soils. In California there are over 200 plant species confined to serpentine soils, which are harsh, nutrient-poor soils derived from rocks of the ocean crust. Edaphic endemics may be unusually vulnerable to climate change for two reasons: because they are trapped on soil "islands" and are thus less able to shift their distributions, and because the effects of a harsh soil may exacerbate the stress of an adverse climate. We will examine this question in two ways: (1) by asking whether Californian serpentine endemics are non-randomly found in more favorable climates, as compared with their closest relatives; (2) by resampling 55-year-old transects in the Klamath Mountains (northern CA - southwestern OR) to ask whether there have been more species disappearances on serpentine at low elevation than on other soils or at higher elevations. Because edaphic endemics contribute substantially to global biodiversity, and because their geographic distributions are unlikely to fit the assumptions of standard climate-based models, this study will fill an important gap in our understanding of the biotic effects of global climate change.

科学家们目前对全球气候变化将如何影响土壤特有种或局限于某些不寻常的岩石或土壤中的植物知之甚少。在加州，有超过200种植物被限制在蛇纹土中，蛇纹土是一种来自海洋地壳岩石的粗糙、营养贫乏的土壤。土壤特有种可能特别容易受到气候变化的影响，原因有二：因为它们被困在土壤“岛屿”上，因此不太能够改变其分布;因为恶劣土壤的影响可能加剧不利气候的压力。我们将从两个方面来研究这个问题：（1）通过询问加利福尼亚的蛇纹岩特有种与它们的近亲相比，是否是在更有利的气候条件下非随机发现的;（2）通过在克拉马斯山脉（北方CA -西南OR）重新采集55年的样带，询问在低海拔的蛇纹岩上是否有比其他土壤或更高海拔更多的物种消失。由于土壤特有种对全球生物多样性的贡献很大，而且它们的地理分布不太可能符合标准气候模型的假设，因此这项研究将填补我们对全球气候变化生物影响的理解中的一个重要空白。