What controls the isotopic signature of terrestrial organic carbon? A biomarker study of the Paleocene and Eocene section in the Bighorn Basin (WY, USA)

是什么控制着陆地有机碳的同位素特征？

• 批准号: 0844212
• 负责人: Katherine Freeman
• 金额: $ 9.67万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2011-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0844212&HistoricalAwards=false
• 关键词: What; controls; isotopic; signature; terrestrial

This award is funded under the American Recovery and Reinvestment Actof 2009 (Public Law 111-5). Earth's climate is warming at a pace and magnitude unprecedented in recent times, with profound (but not easilypredicted) consequences for terrestrial ecology and hydrology. Carbonisotopic signatures are an important tool for geologists studyingterrestrial environmental change on long time scales. However, carbonisotopic signatures can vary widely and work on modern plants reveals both environment and community composition can be equally significantinfluences. Although secular carbon isotope variations of atmospheric carbon dioxide are certainly transferred into ancient plant carbon, and thus soil carbon, so also are ecophysiological differences (e.g.,phylogeny, leaf habit, water use)that modulate carbon isotope fractionation between plant biomass and carbon dioxide and as well as carbon from other inputs such as microbes or weathered carbon. Worksupported by this grant will evaluate the relative importance of environment versus community composition as major mechanisms controlling carbon isotope values and molecular signatures of terrestrial plant inputs in the ancient soils and terrestrial sediments in the Paleoceneand Eocene of the Bighorn Basin (WY, USA) across both short term (PETM) and more protracted (Eocene) global warming.

该奖项是根据2009年《美国复苏与再投资法》（公法111-5）资助的。地球的气候在近期史无前例的速度和幅度升温，对陆地生态学和水文学产生了深远的影响（但不容易预测）。碳质特征是长期尺度上研究环境变化的地质学家的重要工具。但是，碳质特征可能会有所不同，现代植物的作用揭示了环境和社区成分，这同样重要。尽管大气二氧化碳的世俗碳同位素的变化肯定被转移到古代植物碳中，因此是土壤碳的，因此生态生理学差异（例如，系统发育，叶片习惯，用水量），可调节碳同位素分离植物生物量和碳二氧化碳和碳和其他碳等碳等碳含量的碳同位素分馏。该赠款支持的工作将评估环境与社区组成的相对重要性，这是控制碳同位素价值和陆地植物输入的陆地植物输入的分子特征，以及在短期（petm）（petmeene）（petmeene）（petmeene）（petmeene）（protracte）的古老土壤中的陆地植物输入和陆地沉积物中的相对机制。