PROBLEMS IN THE USE OF CLOSED CHAMBERS FOR MEASURING PHOTOSYNTHESIS BY A LOTIC MACROPHYTE.

B. H. Hill; J. R. Webster; A. E. Linkins

doi:10.1520/stp35225s

PROBLEMS IN THE USE OF CLOSED CHAMBERS FOR MEASURING PHOTOSYNTHESIS BY A LOTIC MACROPHYTE.

B. H. Hill, J. R. Webster, A. E. Linkins

Biology (Duluth)

Research output: Contribution to journal › Conference article › peer-review

Abstract

Photosynthesis by Podostemum ceratophyllum in closed production chambers became inhibited by oxygen accumulation and carbon depletion during field investigations. Carbon-14 uptake by this plant during 180-min experiments was initially rapid, then decreased abruptly. The photosynthetic response corresponded to increased oxygen concentration of the chamber water and increased excretion of labelled organic carbon from the plants. Photosynthesis was probably further inhibited by inorganic carbon depletion since this plant is unable to use HCO//3** minus as a carbon source. Alkalinity and pH in the chambers decreased and increased, respectively, reflecting this depletion of available carbon dioxide. These data suggest that use of sealed chambers for aquatic macrophyte production studies may seriously underestimate actual production.

Original language	English (US)
Pages (from-to)	69-75
Number of pages	7
Journal	ASTM Special Technical Publication
DOIs	https://doi.org/10.1520/stp35225s
State	Published - Jan 1 1984

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abstract = "Photosynthesis by Podostemum ceratophyllum in closed production chambers became inhibited by oxygen accumulation and carbon depletion during field investigations. Carbon-14 uptake by this plant during 180-min experiments was initially rapid, then decreased abruptly. The photosynthetic response corresponded to increased oxygen concentration of the chamber water and increased excretion of labelled organic carbon from the plants. Photosynthesis was probably further inhibited by inorganic carbon depletion since this plant is unable to use HCO//3** minus as a carbon source. Alkalinity and pH in the chambers decreased and increased, respectively, reflecting this depletion of available carbon dioxide. These data suggest that use of sealed chambers for aquatic macrophyte production studies may seriously underestimate actual production.",

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N2 - Photosynthesis by Podostemum ceratophyllum in closed production chambers became inhibited by oxygen accumulation and carbon depletion during field investigations. Carbon-14 uptake by this plant during 180-min experiments was initially rapid, then decreased abruptly. The photosynthetic response corresponded to increased oxygen concentration of the chamber water and increased excretion of labelled organic carbon from the plants. Photosynthesis was probably further inhibited by inorganic carbon depletion since this plant is unable to use HCO//3** minus as a carbon source. Alkalinity and pH in the chambers decreased and increased, respectively, reflecting this depletion of available carbon dioxide. These data suggest that use of sealed chambers for aquatic macrophyte production studies may seriously underestimate actual production.

AB - Photosynthesis by Podostemum ceratophyllum in closed production chambers became inhibited by oxygen accumulation and carbon depletion during field investigations. Carbon-14 uptake by this plant during 180-min experiments was initially rapid, then decreased abruptly. The photosynthetic response corresponded to increased oxygen concentration of the chamber water and increased excretion of labelled organic carbon from the plants. Photosynthesis was probably further inhibited by inorganic carbon depletion since this plant is unable to use HCO//3** minus as a carbon source. Alkalinity and pH in the chambers decreased and increased, respectively, reflecting this depletion of available carbon dioxide. These data suggest that use of sealed chambers for aquatic macrophyte production studies may seriously underestimate actual production.

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PROBLEMS IN THE USE OF CLOSED CHAMBERS FOR MEASURING PHOTOSYNTHESIS BY A LOTIC MACROPHYTE.

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