Testing the consequences of the carbon-quality temperature hypothesis for soil organic matter decomposition
测试碳质量温度假说对土壤有机质分解的影响
基本信息
- 批准号:0816629
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2008
- 资助国家:美国
- 起止时间:2008-09-01 至 2011-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This research will investigate how sensitively carbon dioxide loss from soil responds to increasing temperature and why this varies among different soils. Soils from a variety of ecosystems across the United States will be collected and assayed under controlled laboratory conditions in order to determine how fast soil carbon is respired by microbes at different temperatures and how increases in biologically available nitrogen affect this temperature sensitivity. The research will be testing predictions as to whether recalcitrant soil carbon loss will be more sensitive to increases in temperature than less recalcitrant soil carbon. In addition, the research will test whether increases in nitrogen availability decrease temperature sensitivity. Globally, soil carbon is one of the largest repositories of carbon, yet its fate in a warmer world will be impossible to predict without mechanistic understanding of what controls how soil microbes utilize it. For global change biologists, this research will test a critical set of hypotheses about soil functioning and will provide data that are essential to improving models of how ecosystems respond to climate change and deposition of biologically available nitrogen. At the heart of the research is determining whether warming soils are likely to provide a positive feedback to global temperatures while also identifying those soils and components of soils that are most susceptible to carbon loss due to warming.
这项研究将调查土壤中的二氧化碳损失对温度升高的反应有多敏感,以及为什么这在不同的土壤中有所不同。来自美国各地各种生态系统的土壤将被收集并在受控的实验室条件下进行分析,以确定微生物在不同温度下呼吸土壤碳的速度,以及生物有效氮的增加如何影响这种温度敏感性。这项研究将测试一些预测,即顽固性土壤碳的损失是否比不顽固性土壤碳更容易受到温度升高的影响。此外,该研究将测试氮素可用性的增加是否会降低温度敏感性。在全球范围内,土壤碳是最大的碳储存库之一,但如果不从机制上理解是什么控制着土壤微生物如何利用它,就无法预测它在变暖世界中的命运。对于全球变化生物学家来说,这项研究将测试一组关于土壤功能的关键假设,并将提供数据,这些数据对于改进生态系统如何响应气候变化和生物可用氮沉积的模型至关重要。这项研究的核心是确定变暖的土壤是否有可能对全球温度提供积极的反馈,同时也要确定那些最容易因变暖而导致碳损失的土壤和土壤成分。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Joseph Craine其他文献
Joseph Craine的其他文献
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{{ truncateString('Joseph Craine', 18)}}的其他基金
International Research Fellowship Program: Effects of Soils and Precipitation on Plant and Ecosystem Traits in South African Savanna
国际研究奖学金计划:南非稀树草原土壤和降水对植物和生态系统特征的影响
- 批准号:
0301834 - 财政年份:2003
- 资助金额:
-- - 项目类别:
Fellowship Award
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