Photosynthesis and 13 C / 12 C ratios in Amazonian rain forests

Details Photosynthesis and 13 C / 12 C ratios in Amazonian rain forests Photosynthesis and 13 C / 12 C ratios in Amazonian rain forests

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.1091v&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 5, pp.1091-1094

Physics

22

Scientific paper

Measurements are reported of 13 C / 12 C ratios for air CO 2 at different heights in two Amazonian rain forests. CO 2 emitted from the forest floor is severely depleted in 13 C which produces isotopically light source air throughout the forest. Air 13 C values vary very little with height above ground, but are about 5 to 6 more negative than the open atmosphere. CO 2 recycling under the canopy depletes all leaf 13 C values by a like amount. Additional factors further deplete leaf 13 C values by 4 to 5 at ground level; this effect decreases with height to zero in the upper canopy, yielding a gradient in 13 C values.

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