Dissertation Research: Global Warming and Soil Organic Matter Dynamics: An Experimental Investigation of the Effects of Climate on Soil Carbon Pool Structure

论文研究：全球变暖与土壤有机质动态：气候对土壤碳库结构影响的实验研究

• 批准号: 9623433
• 负责人: John Harte
• 金额: $ 0.8万
• 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: 1996
• 资助国家: 美国
• 起止时间: 1996-06-15 至 1998-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9623433&HistoricalAwards=false
• 关键词: Dissertation; Research; Global; Warming; Soil

9623433 Harte Global warming and soil organic matter dynamics: an experimental investigation of the effects of climate on soil carbon pool structure. Results from an ongoing warming manipulation in a high-altitude meadow ecosystem indicate that warming may be reducing the stock of carbon in the bulk soil organic matter. Since such an effect would constitute a positive feedback mechanism to the global warming predicted to follow from current greenhouse gas emissions, understanding it is important to fully understanding global warming itself The funds requested by this proposal will provide for a further investigation of the structure of the soil carbon pool in the study ecosystem. The aim is to better quantify the magnitude of the soil carbon loss, identify the pools of soil carbon from which it comes, and understand the underlying dynamics that will determine the timescale over which it might operate. Specifically, the PIs propose to apply: 1) recent advances in soil organic matter fractionation techniques, and 2) new methods being developed to quantify the structure of microbial decomposer communities, to soils from the warming manipulation. Organic matter fractionation divides soil carbon into pools according to turnover time (thereby revealing structure essential to predicting the long-term response to warming); identifying any potential shifts in the microbial decomposer community that might be associated with changes in the soil carbon structure will help illuminate biological mechanisms important in ecosystem response to warming.

9623433全球变暖与土壤有机质动态：气候对土壤碳库结构影响的实验研究。在高海拔草甸生态系统中进行的一项持续变暖操作的结果表明，变暖可能会减少大部分土壤有机质中的碳储量。由于这种影响将构成对目前温室气体排放预计将导致的全球变暖的积极反馈机制，理解充分了解全球变暖本身是重要的，这项提议所要求的资金将为进一步调查研究生态系统中土壤碳库的结构提供依据。其目的是更好地量化土壤碳损失的大小，确定其来源的土壤碳库，并了解将决定其可能运行的时间尺度的潜在动态。具体地说，PI建议应用：1)土壤有机质分级技术的最新进展，以及2)正在开发的量化微生物分解者群落结构的新方法，以应对变暖操作对土壤的影响。有机质分级根据周转时间将土壤碳划分为碳库(从而揭示了预测长期气候变暖反应所必需的结构)；识别微生物分解者群落中可能与土壤碳结构变化相关的任何潜在变化，将有助于阐明生态系统对气候变暖反应的重要生物学机制。