Feedbacks Between Species Composition and Ecosystem Nutrient Cycling in a California Grassland

加州草原物种组成与生态系统养分循环之间的反馈

• 批准号: 9910008
• 负责人: Carla D'Antonio
• 金额: $ 30.51万
• 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: 2000-07-01 至 2004-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9910008&HistoricalAwards=false
• 关键词: Feedbacks; Between; Species; Composition; Ecosystem

DEB-9910008Carla D'Antonio- University of California at BerkelyFeedbacks between species composition and ecosystem nutrient cycling in a California grassland This research investigates the effect of species composition on the cycling of nitrogen in soil of a California coastal prairie ecosystem. While most low-elevation California grasslands were formerly dominated by perennial bunchgrasses native to California, invasion by Eurasian annual grasses and forbs and, more recently, Eurasian perennial grasses, has caused a dramatic shift in their composition. We know very little about the consequences of this compositional change for the cycling and retention of soil nitrogen - an essential nutrient that limits plant growth in these ecosystems. The aim of this study is to investigate whether differences in nitrogen uptake and use by native perennial grasses, versus Eurasian annual or perennial grasses leads to differences in nitrogen cycling and leaching in plots dominated by each type of grass. We are particularly interested in whether vegetation composition and soil nitrogen cycling interact to make communities resistant to further compositional changes.

DEB-9910008Carla D'Antonio- 加州大学伯克利分校加州草原物种组成与生态系统养分循环之间的反馈本研究调查物种组成对加州沿海草原生态系统土壤氮循环的影响。虽然大多数低海拔加州草原以前以加州本土的多年生丛生禾本科植物为主，但欧亚一年生草本植物和杂草以及最近欧亚多年生草本植物的入侵已导致其组成发生巨大变化。我们对这种成分变化对土壤氮循环和保留的影响知之甚少——土壤氮是限制这些生态系统中植物生长的必需营养素。本研究的目的是调查本地多年生草与欧亚一年生或多年生草的氮吸收和利用差异是否会导致以每种草为主的地块中氮循环和淋溶的差异。我们特别感兴趣的是植被组成和土壤氮循环是否相互作用，使群落能够抵抗进一步的组成变化。