Carbon and hydrogen isotope fractionation under continuous light: implications for paleoenvironmental interpretations of the High Arctic during Paleogene warming.
作者： Hong Yang , Mark Pagani , Derek E. G. Briggs , M. A. Equiza , Richard Jagels
DOI: 10.1007/S00442-009-1321-1
关键词:
摘要: The effect of low intensity continuous light, e.g., in the High Arctic summer, on plant carbon and hydrogen isotope fractionations is unknown. We conducted greenhouse experiments to test impact light quantity duration both com- positions three deciduous conifers whose fossil counterparts were components Paleogene floras: Metasequoia glyptostroboides, Taxodium distichum, Larix laricina. found that leaf bulk iso- topic values examined species 1.75-4.63% more negative under (CL) than diurnal (DL). Hydrogen n-alkanes conditions revealed a D-enriched composition up 40% higher conditions. offsets between two regimes explained by ratio intercellular atmospheric CO2 concentration (Ci/Ca) water loss for plants during 24-h transpiration cycle. Apparent source individual lipids (elipid-water) range from -62% (Metase- quoia C27 C29 )t o-87% (Larix C29) leaves light. applied these fractionation factors compositions situ well-preserved conifer fossils region estimate dD value ancient precipitation. Precipitation summer growing season yielded -186% late Paleocene, -157% early middle Eocene, -182% Eocene. propose high-latitude precipita- tion this was supplemented moisture derived regionally recycled polar forests grew warming.
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