Models of the Use of Root-zone CO2 by Selected North American Isoetids
Sediment CO2, entering via the roots, contributes a significant portion of the total carbon uptake for isoetids (small, evergreen, submersed, vascular plants). Laboratory studies of inorganic carbon uptake via the roots and shoots by five isoetids were used to model the use of root-zone CO2. Simple...
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Published in | Annals of botany Vol. 60; no. 5; pp. 495 - 503 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
London
Oxford University Press
01.11.1987
Academic Press Inc Academic Press |
Subjects | |
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Abstract | Sediment CO2, entering via the roots, contributes a significant portion of the total carbon uptake for isoetids (small, evergreen, submersed, vascular plants). Laboratory studies of inorganic carbon uptake via the roots and shoots by five isoetids were used to model the use of root-zone CO2. Simple first-order linear models accounted for at least 75 per cent of the variation in the data for Gratiola aurea, Isoetes macrospora, Littorella uniflora and Lobelia dortmanna. For Eriocaulon septangulare, which relies almost exclusively on root-zone CO2, models could account for only about 62 per cent of the variation in root-zone CO2 use. For each species, we present the best fitting regression of root-zone CO2 use as a function of root- and shoot-zone CO2 concentrations. For the species studied, carbon uptake was not saturated at field concentrations of root and shoot-zone CO2. Maximum rates of carbon uptake were lower for species that naturally occurred at greater depths, compared with species more common in shallow water. At equal external CO2 concentrations carbon entry per unit root surface area was several times more rapid than entry per unit shoot surface area for L. dortmanna. The entry rates per unit root and shoot surface area were about equal for G. aurea and E. septangulare. Shoots were equally or more permeable than the roots of L. uniflora and I. macrospora, a fact that may be related to the functioning of crassulacean acid metabolism in these plants. |
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AbstractList | Sediment CO2, entering via the roots, contributes a significant portion of the total carbon uptake for isoetids (small, evergreen, submersed, vascular plants). Laboratory studies of inorganic carbon uptake via the roots and shoots by five isoetids were used to model the use of root-zone CO2. Simple first-order linear models accounted for at least 75 per cent of the variation in the data for Gratiola aurea, Isoetes macrospora, Littorella uniflora and Lobelia dortmanna. For Eriocaulon septangulare, which relies almost exclusively on root-zone CO2, models could account for only about 62 per cent of the variation in root-zone CO2 use. For each species, we present the best fitting regression of root-zone CO2 use as a function of root- and shoot-zone CO2 concentrations. For the species studied, carbon uptake was not saturated at field concentrations of root and shoot-zone CO2. Maximum rates of carbon uptake were lower for species that naturally occurred at greater depths, compared with species more common in shallow water. At equal external CO2 concentrations carbon entry per unit root surface area was several times more rapid than entry per unit shoot surface area for L. dortmanna. The entry rates per unit root and shoot surface area were about equal for G. aurea and E. septangulare. Shoots were equally or more permeable than the roots of L. uniflora and I. macrospora, a fact that may be related to the functioning of crassulacean acid metabolism in these plants. Sediment CO₂, entering via the roots, contributes a significant portion of the total carbon uptake for isoetids (small, evergreen, submersed, vascular plants). Laboratory studies of inorganic carbon uptake via the roots and shoots by five isoetids were used to model the use of root-zone CO₂. Simple first-order linear models accounted for at least 75 per cent of the variation in the data for Gratiola aurea, Isoetes macrospora, Littorella uniflora and Lobelia dortmanna. For Eriocaulon septangulare, which relies almost exclusively on root-zone CO₂, models could account for only about 62 per cent of the variation in root-zone CO₂ use. For each species, we present the best fitting regression of root-zone CO₂ use as a function of root-and shoot-zone CO₂ concentrations. For the species studied, carbon uptake was not saturated at field concentrations of root and shoot-zone CO₂. Maximum rates of carbon uptake were lower for species that naturally occurred at greater depths, compared with species more common in shallow water. At equal external CO₂ concentrations carbon entry per unit root surface area was several times more rapid than entry per unit shoot surface area for L.dortmanna. The entry rates per unit root and shoot surface area were about equal for G. aurea and E.septangulare. Shoots were equally or more permeable than the roots of L. uniflora and I. macrospora, a fact that may be related to the functioning of crassulacean acid metabolism in these plants. |
Author | PIENKOWSKI, THOMAS P. ADAMS, MICHAEL S. BOSTON, HARRY L. |
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Keywords | Monocotyledones United States North America Plantaginaceae Dicotyledones America Angiospermae Campanulaceae Scrophulariaceae Spermatophyta Models Eriocaulaceae Aquatic plant Photosynthesis |
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Snippet | Sediment CO2, entering via the roots, contributes a significant portion of the total carbon uptake for isoetids (small, evergreen, submersed, vascular plants).... Sediment CO₂, entering via the roots, contributes a significant portion of the total carbon uptake for isoetids (small, evergreen, submersed, vascular plants).... |
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SubjectTerms | Animal and plant ecology Animal, plant and microbial ecology Autoecology Biological and medical sciences Carbon CO2 Eriocaulon septangulare Fundamental and applied biological sciences. Psychology Gratiola aurea Isoetes macrospora isoetid Leaves Linear models Littorella uniflora Lobelia dortmanna Macrophytes Photosynthesis Plant ecology Plant roots Plants Plants and fungi Sediments Surface areas |
Title | Models of the Use of Root-zone CO2 by Selected North American Isoetids |
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