Re-examining the reliability of tree-ring isotope ratio as a historical CO2 proxy |
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Authors: | Aimin Hou Shaolin Peng Guoyi Zhou Dazhi Wen |
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Institution: | South China Institute of Botany, Chinese Academy of Sciences, Guangzhou 510275 ,China |
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Abstract: | To examine the reliability of using tree ring δ13C and the model of isotopic fractionation in reconstructing atmospheric CO2 levels, we studied the variations of some important parameters of several subtropical species under natural field conditions. It was found that, different from other researchers’ results, leaf conductance to CO2 transfer, g, did not change in proportion to the change in rate of CO2 assimilation, A, with the result that intercellular concen- tration of CO2, Ci, could not keep constant. Thus, we conclude that the use of tree-ring isotope ratios in the reconstruction of atmospheric CO2 variation based on the presupposition that Ci keeps constant during assimilation is not reliable under current circumstances. |
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Keywords: | A/g Ci  tree-ring isotope ratio reconstruction atmo- spheric CO2 variation |
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