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

QEIB：合作研究：陆地生态系统中土壤有机碳的侵蚀去除和重新分配

• 批准号: 0128995
• 负责人: Arjun Heimsath
• 金额: $ 21.77万
• 依托单位: Dartmouth College
• 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 2006-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0128995&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 Amundson (0129057).

该项目测试和探索了这样一种假设，即旱地生态系统中的土壤侵蚀构成了大气二氧化碳的一个可测量和重要的汇。这一假设正在分水岭中进行检验，那里的土壤侵蚀率以前是通过宇宙成因的同位素测量确定的。在每个现场，研究人员将挖掘大量的土壤剖面，测量其总碳储量，计算地形凸起部分的碳损失率，并使用扩散建模方法计算凹陷区域(凹陷)的碳储量。其他辅助性土壤有机质性质(C：N比、N含量和N同位素组成)预计将随着侵蚀而发生系统变化，将被测量以进一步检验和证实我们的假设。这项工作将解决土壤在全球碳收支中的作用的一个很大的不确定性。这是与Amundson(0129057)的合作提案。