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

Van Der Merwe, N J; Medina, E

doi:10.1016/0016-7037(89)90213-5

Title: Photosynthesis and sup 13 C/ sup 12 C ratios in Amazonian rain forests

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Abstract

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

Authors:

Van Der Merwe, N J ^[1]; Medina, E ^[2]

Univ. of Cape Town, Rondebosch (South Africa)
Instituto Venezolano de Investigaciones Cientificas, Caracas (Venezuela)

Publication Date:: Mon May 01 00:00:00 EDT 1989

OSTI Identifier:: 5020446

Resource Type:: Journal Article

Journal Name:: Geochimica et Cosmochimica Acta; (USA)

Additional Journal Information:: Journal Volume: 53:5; Journal ID: ISSN 0016-7037

Country of Publication:: United States

Language:: English

Subject:: 58 GEOSCIENCES; 54 ENVIRONMENTAL SCIENCES; BRAZIL; ATMOSPHERIC CHEMISTRY; SOILS; CARBON DIOXIDE; ISOTOPE RATIO; AMAZON RIVER; CARBON 12; CARBON 13; PHOTOSYNTHESIS; RESPIRATION; SOIL CHEMISTRY; CARBON COMPOUNDS; CARBON ISOTOPES; CARBON OXIDES; CHALCOGENIDES; CHEMICAL REACTIONS; CHEMISTRY; DEVELOPING COUNTRIES; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; ISOTOPES; LATIN AMERICA; LIGHT NUCLEI; NUCLEI; OXIDES; OXYGEN COMPOUNDS; PHOTOCHEMICAL REACTIONS; RIVERS; SOUTH AMERICA; STABLE ISOTOPES; STREAMS; SURFACE WATERS; SYNTHESIS; 580000* - Geosciences; 540120 - Environment, Atmospheric- Chemicals Monitoring & Transport- (1990-)

Citation Formats


                    Van Der Merwe, N J, and Medina, E. Photosynthesis and sup 13 C/ sup 12 C ratios in Amazonian rain forests.  United States: N. p., 1989. 
        Web.  doi:10.1016/0016-7037(89)90213-5.

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                    Van Der Merwe, N J, & Medina, E. Photosynthesis and sup 13 C/ sup 12 C ratios in Amazonian rain forests.  United States.  https://doi.org/10.1016/0016-7037(89)90213-5

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                    Van Der Merwe, N J, and Medina, E. 1989.  
        "Photosynthesis and sup 13 C/ sup 12 C ratios in Amazonian rain forests".  United States.  https://doi.org/10.1016/0016-7037(89)90213-5.

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@article{osti_5020446,

  title        = {Photosynthesis and sup 13 C/ sup 12 C ratios in Amazonian rain forests},

  author       = {Van Der Merwe, N J and Medina, E},

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

  doi          = {10.1016/0016-7037(89)90213-5},

  url          = {https://www.osti.gov/biblio/5020446},
  journal      = {Geochimica et Cosmochimica Acta; (USA)},

  issn         = {0016-7037},

  number       = ,

  volume       = 53:5,

  place        = {United States},

  year         = {Mon May 01 00:00:00 EDT 1989},

  month        = {Mon May 01 00:00:00 EDT 1989}

}

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