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Climatic and Environmental Controls on the Variation

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  “Climatic andenvironmentalcontrolsonthevariationofC3andC4plantabundancesincentralFloridaforthepast62,000years. ” Yongsong Huang a,*, Bryan Shuman a,b, Yi Wang a, Thompson Webb I,Eric C. Grimm c, George L. Jacobson Jr. d  Nicolas Piege & Shahbaz Ahmad  Contents 1.Introduction & research question2.Methodology (Sampling & experimental techniques) 3.Results & discussion4.Conclusion & Outlook 1  Introduction & Research question ã Lake Tulane as study site in Florida, USA ã Main goals were1.to obtain the first 62,000 year record of carbon-isotope records of higher plant biomarkers for eastern North America2.to quantify changes in the relative abundance of C3 and C4 and to assess the impact of precipitation vs. pCO2 on the C3/C4 plant ratios3.to provide new insights on the vegetation and climate change in the study region 2  Why Lake Tulane as study site? ã Sinkholelakecontinuousrecordof sedimentationforthepast62000years  – whichisunlikelytofindanywhereelse    6   2   0   0   0   y   e   a   r   s   P   r   e   s   e   n   t 3 Exceptional preservation of sediments in a sinkhole!

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