Evaluating plant carbon isotope fractionation as a pCO2 proxy for the geologic record

评估植物碳同位素分馏作为地质记录的 pCO2 代理

• 批准号: 1636546
• 负责人: Aaron Diefendorf
• 金额: $ 13.82万
• 依托单位: University of Cincinnati Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1636546&HistoricalAwards=false
• 关键词: Evaluating; plant; carbon; isotope; fractionation

Plant carbon isotopes preserved in the sedimentary record are valuable proxies for paleovegetation and paleoclimate in the absence of pollen or macrofossils. Plant carbon isotopes will be measured from leaf waxes preserved in a suite of samples that capture known periods of high CO2 concentration in the Eocene and Oligocene to reconcile conflicts in our understanding of the factors that influence plant carbon isotopes over geologic time. The carbon isotopic composition of plants is used to understand past changes in environment, vegetation, and climate. This project will use the geologic record to examine changes in plant carbon isotopes during times of high atmospheric CO2. The project will benefit society by improving an important proxy for understanding Earth's past climate. In addition to training of an undergraduate and graduate student, this project will foster a broader public understanding of scientific research by expanding on current exhibits in collaboration with the Cincinnati Museum Center, a large urban cultural institution.

沉积记录中保存的植物碳同位素在没有花粉或大型化石的情况下是古植被和古气候的重要代用物。植物碳同位素将从保存在一套样品中的叶蜡中进行测量，这些样品捕获了始新世和渐新世已知的高二氧化碳浓度时期，以调和我们对地质时期影响植物碳同位素因素的理解中的冲突。植物的碳同位素组成被用来了解过去环境、植被和气候的变化。该项目将利用地质记录来检查大气中二氧化碳含量高的时期植物碳同位素的变化。该项目将通过改进了解地球过去气候的重要代理来造福社会。除了培养本科生和研究生外，该项目还将通过与辛辛那提博物馆中心（一个大型城市文化机构）合作，扩大目前的展览，从而促进公众对科学研究的更广泛理解。

项目成果

Conifers are a major source of sedimentary leaf wax n-alkanes when dominant in the landscape: Case studies from the Paleogene

当针叶树在景观中占主导地位时，它是沉积叶蜡正烷烃的主要来源：古近纪的案例研究

• DOI: 10.1016/j.orggeochem.2020.104069
• 发表时间: 2020
• 期刊: Organic Geochemistry
• 影响因子: 3
• 作者: Schlanser, Kristen M.;Diefendorf, Aaron F.;West, Christopher K.;Greenwood, David R.;Basinger, James F.;Meyer, Herbert W.;Lowe, Alexander J.;Naake, Hans H.
• 通讯作者: Naake, Hans H.

On geologic timescales, plant carbon isotope fractionation responds to precipitation similarly to modern plants and has a small negative correlation with pCO2

• DOI: 10.1016/j.gca.2019.11.023
• 发表时间: 2020-02
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: K. Schlanser;A. Diefendorf;D. Greenwood;K. Mueller;C. K. West;A. Lowe;J. Basinger;E. Currano;A. Flynn;H. Fricke;Jie Geng;H. Meyer;D. Peppe

Plant wax and carbon isotope response to heat and drought in the conifer Juniperus monosperma

针叶树杜松植物蜡和碳同位素对热和干旱的响应

• DOI: 10.1016/j.orggeochem.2021.104197
• 发表时间: 2021
• 期刊: Organic Geochemistry
• 影响因子: 3
• 作者: Diefendorf, Aaron F.;Bickford, Christopher P.;Schlanser, Kristen M.;Freimuth, Erika J.;Hannon, Jeffrey S.;Grossiord, Charlotte;McDowell, Nate G.
• 通讯作者: McDowell, Nate G.