Carbon isotopes of trees from arid environments and implications for reconstructing atmospheric CO 2 concentration

Details Carbon isotopes of trees from arid environments and implications for reconstructing atmospheric CO 2 concentration Carbon isotopes of trees from arid environments and implications for reconstructing atmospheric CO 2 concentration

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.2599f&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 12, pp.2599-2608

Physics

16

Scientific paper

Four trees from San Dimas, the Santa Monica Mountains and the White Mountains of California, and Sinai Peninsula are studied for carbon isotope ratios. These trees grew in arid environments where vegetation is sparse and canopy effect is minimized. The 13 C time series obtained from wood segments of these trees contain high-frequency variations and a long-term decreasing trend. The high-frequency signals can be effectively explained by the variations of precipitation. The low-frequency trend cannot be accounted for only by the 13 C variation of atmospheric CO 2 . The CO 2 concentration in the atmosphere also attributed to the progressive depletion in the 13 C contents of these trees. These results indicate a possibility of using 13 C of plants as a proxy indicator of the concentration of atmospheric CO 2 , provided that the 13 C value of the open atmosphere can be constrained independently. Plant water-use efficiency is not a simple function of the CO 2 concentration of the atmosphere. It can increase, remain constant, or decrease with an increase of the atmospheric CO 2 concentration.

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