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Title: Chemical and anatomical changes in Liquidambar styraciflua L. xylem after long term exposure to elevated CO2

The anatomical and chemical characteristics of sweetgum were studied after 11 years of elevated CO2 (544 ppm, ambient at 391 ppm) exposure. Anatomically, branch xylem cells were larger for elevated CO2 trees, and the cell wall thickness was thinner. Chemically, elevated CO2 exposure did not impact the structural components of the stem wood, but non-structural components were significantly affected. Principal component analysis (PCA) was employed to detect differences between the CO2 treatments by considering numerous structural and chemical variables, as well as tree size, and data from previously published sources (for example, root biomass, production and turnover). The PCA results indicated a clear separation between trees exposed to ambient and elevated CO2 conditions. Lastly, correlation loadings plots of the PCA revealed that stem structural components, ash, Ca, Mg, total phenolics, root biomass, production and turnover were the major responses that contribute to the separation between the elevated and ambient CO2 treated trees.
 [1] ;  [1] ;  [2] ;  [3] ;  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States). Center for Renewable Carbon
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Climate Change Science Inst. and Environmental Sciences Division
  3. USDA-Forest Service, Southern Research Station, Pineville, LA (United States)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
AC05-00OR22725; 2010-34158-20930
Accepted Manuscript
Journal Name:
Environmental Pollution
Additional Journal Information:
Journal Volume: 198; Journal Issue: C; Journal ID: ISSN 0269-7491
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
54 ENVIRONMENTAL SCIENCES Free air CO₂ enrichment; Sweetgum; Chemical composition; Hydraulic conductivity; PCA