Dissertation Research: Origin and Flux of Soil Carbon Following Shrub Invasion: Isotopic Analyses of Community Change

论文研究：灌木入侵后土壤碳的起源和通量：群落变化的同位素分析

• 批准号: 9520743
• 负责人: Ross Virginia
• 金额: $ 0.6万
• 依托单位: Dartmouth College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-09-15 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9520743&HistoricalAwards=false
• 关键词: Dissertation; Research; Origin; Flux; Soil

9520743 VIRGINIA Aridland productivity is closely linked to the organic carbon cycle. Few studies address changes in soil carbon resulting from desertification. Previous studies suggest that desertification results primarily from modifications in soil carbon source / sink relationships and long-term ecosystem stability. These impacts may reduce the economic potential of aridland regions. The proposed study tests these hypotheses using organic carbon abundance techniques and radiocarbon dating to quantify changes in modern carbon cycles. The study will provide initial quantification of long-term accumulation / decomposition process in a changing aridland environment, characterize changes in total soil carbon due to desertification, and compare modern desertification rates with past community changes and climatic history.

9520743 VIRGINIA 干旱地区的生产力与有机碳循环密切相关。 很少有研究涉及荒漠化引起的土壤碳变化。 先前的研究表明，荒漠化主要是由于土壤碳源/汇关系和长期生态系统稳定性的改变造成的。 这些影响可能会降低干旱地区的经济潜力。 拟议的研究使用有机碳丰度技术和放射性碳测年来测试这些假设，以量化现代碳循环的变化。 该研究将对不断变化的干旱地区环境中的长期积累/分解过程进行初步量化，描述荒漠化引起的土壤总碳变化，并将现代荒漠化率与过去的群落变化和气候历史进行比较。