Dissertation Research: Changes in Belowground Carbon Dynamics Under Free-Air Carbon Dioxide Enrichment (FACE)

论文研究：自由空气二氧化碳富集下地下碳动力学的变化（FACE）

• 批准号: 9700830
• 负责人: William Schlesinger
• 金额: $ 1万
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-05-01 至 1999-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9700830&HistoricalAwards=false
• 关键词: Dissertation; Research; Changes; Belowground; Carbon

9700830 Schlesinger This project, centered around the Free-Air Carbon dioxide Enrichment (FACE) experiment in the Duke Forest of central North Carolina, is designed to elucidate changes in soil carbon dynamics in response to an ecosystem-level atmospheric CO2 enrichment. In reaching this objective, the research proposed here is intended to address questions surrounding process-level understanding of soil function and its link with the atmosphere and groundwater. Fluxes of carbon into and out of the soil system, as well as transfers and storage within the soil profile, will be examined. Importantly, the study will capitalize on the use of stable carbon isotope (C-13) tracers that will be introduced into the atmosphere of the FACE plot with the CO2 enrichment. This isotope tracer will allow the examination of the rate of carbon incorporation into soil organic matter, the effect of soil acidity on weathering rates, and the potential of a long-term atmospheric carbon sink in soils and groundwater. This research is of particular interest and importance to global change scientists and policy-makers interested in the "missing sink", soil scientists examining carbon dynamics, and geochemists interested in the extent of biotic control over chemical weathering.

9700830 Schlesinger该项目围绕北卡罗来纳州中部杜克森林的自由空气二氧化碳富集（FACE）实验，旨在阐明土壤碳动态变化对生态系统水平大气CO2富集的响应。在实现这一目标，这里提出的研究是为了解决周围的过程水平的理解土壤功能及其与大气和地下水的联系的问题。将检查进出土壤系统的碳通量以及土壤剖面内的转移和储存。重要的是，这项研究将利用稳定碳同位素（C-13）示踪剂的使用，这些示踪剂将被引入到CO2富集的FACE地块的大气中。这种同位素示踪剂将允许检查土壤有机质中的碳结合率，土壤酸度对风化率的影响，以及土壤和地下水中长期大气碳汇的潜力。这项研究是特别感兴趣的和重要的全球变化科学家和决策者感兴趣的“失踪汇”，土壤科学家检查碳动力学，和地球化学家感兴趣的生物控制化学风化的程度。