QEIB: Collaborative Research: Erosional Removal and Redistribution of Soil Organic Carbon at Upland Ecosystems

QEIB：合作研究：高地生态系统土壤有机碳的侵蚀去除和重新分配

• 批准号: 0129057
• 负责人: Ronald Amundson
• 金额: $ 15.78万
• 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: 2002
• 资助国家: 美国
• 起止时间: 2002-07-01 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0129057&HistoricalAwards=false
• 关键词: QEIB; Collaborative; Research; Erosional; Removal

This project tests and explores the hypothesis that soil erosion in upland ecosystems constitutes a measurable and significant sink of atmospheric carbon dioxide. The hypothesis is being tested in watersheds where soil erosion rates have been previously determined using cosmogenic isotope measurements. At each field site, the researchers will excavate numerous soil profiles, measure their total carbon storage, calculate rates of carbon loss from convex portions of the landscape, and calculate storage in concave areas (hollows), using a diffusion modeling approach. Other ancillary soil organic matter properties (C:N ratio, N content, and N isotope composition) predicted to change systematically with erosion, will be measured to further test and confirm our hypothesis. The work will address one of the great uncertainties about the role of soils in the global carbon budget.This is a collaborative proposal with Heimsath (0128995).

该项目测试并探讨了以下假设：高地生态系统中的土壤侵蚀构成了大气二氧化碳的可测量且显着的水槽。该假设正在在先前使用宇宙同位素测量的水土侵蚀率的流域进行检验。在每个现场地点，研究人员将挖掘许多土壤剖面，测量其总碳存储，计算景观凸的部分碳丢失率，并使用扩散建模方法计算凹面区域（空心）中的存储。将测量其他辅助土壤有机物特性（C：N比，N含量和N同位素组成），该特性将通过侵蚀系统地进行系统变化，以进一步检验并确认我们的假设。这项工作将解决有关土壤在全球碳预算中作用的最大不确定性之一。这是与海姆萨斯（0128995）的合作提议。