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Teitel, M., Institute of Agricultural Engineering, Agricultural Research Organization, The Volcani Center, POB 6, Bet-Dagan 50250, Israel
Atias, M., Institute of Agricultural Engineering, Agricultural Research Organization, The Volcani Center, POB 6, Bet-Dagan 50250, Israel
Schwartz, A., The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, Faculty of Agricultural, Food and Environmental Quality Sciences, The Hebrew University of Jerusalem, POB 12, Rehovot 76100, Israel
Cohen, S., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, The Volcani Center, POB 6, Bet-Dagan 50250, Israel
Measurements of whole-canopy gas exchange - of CO 2 and H 2O - are important for agricultural and ecological reasons. The objective of this study was to investigate the use of a full-size greenhouse as an open-chamber system for measuring canopy-scale gas exchange. Measurements were validated by comparison with gas exchange scaled up from leaf- and plant-level measurements. Leaf-level measurements used a conventional hand-held cuvette gas exchange system at many points in the greenhouse. The experiments were done in a greenhouse with an area of (15×24)m 2 in which a pepper crop was grown. Within the canopy photosynthetic activity and transpiration changed with height, as expected. In addition, it was shown both theoretically and experimentally that in the absence of air mixing within the chamber, gradients of CO 2 and H 2O developed along the airflow direction. Theoretical estimates of the gradients were in good agreement with measured values. In spite of the gradients, canopy photosynthesis and transpiration could be estimated relatively accurately. For instance, the values of canopy photosynthesis and transpiration, during the course of the day, as measured with the open-chamber approach, were in good agreement with mean values obtained from measurements on individual leaves. However, transpiration values obtained both from open-chamber measurements and from individual leaves were generally a little lower than those obtained with lysimeters. © 2011 Elsevier B.V.
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הספר "אוצר וולקני"
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תנאי שימוש
Use of a greenhouse as an open chamber for canopy gas exchange measurements: Methodology and validation
151
Teitel, M., Institute of Agricultural Engineering, Agricultural Research Organization, The Volcani Center, POB 6, Bet-Dagan 50250, Israel
Atias, M., Institute of Agricultural Engineering, Agricultural Research Organization, The Volcani Center, POB 6, Bet-Dagan 50250, Israel
Schwartz, A., The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, Faculty of Agricultural, Food and Environmental Quality Sciences, The Hebrew University of Jerusalem, POB 12, Rehovot 76100, Israel
Cohen, S., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, The Volcani Center, POB 6, Bet-Dagan 50250, Israel
Use of a greenhouse as an open chamber for canopy gas exchange measurements: Methodology and validation
Measurements of whole-canopy gas exchange - of CO 2 and H 2O - are important for agricultural and ecological reasons. The objective of this study was to investigate the use of a full-size greenhouse as an open-chamber system for measuring canopy-scale gas exchange. Measurements were validated by comparison with gas exchange scaled up from leaf- and plant-level measurements. Leaf-level measurements used a conventional hand-held cuvette gas exchange system at many points in the greenhouse. The experiments were done in a greenhouse with an area of (15×24)m 2 in which a pepper crop was grown. Within the canopy photosynthetic activity and transpiration changed with height, as expected. In addition, it was shown both theoretically and experimentally that in the absence of air mixing within the chamber, gradients of CO 2 and H 2O developed along the airflow direction. Theoretical estimates of the gradients were in good agreement with measured values. In spite of the gradients, canopy photosynthesis and transpiration could be estimated relatively accurately. For instance, the values of canopy photosynthesis and transpiration, during the course of the day, as measured with the open-chamber approach, were in good agreement with mean values obtained from measurements on individual leaves. However, transpiration values obtained both from open-chamber measurements and from individual leaves were generally a little lower than those obtained with lysimeters. © 2011 Elsevier B.V.
Scientific Publication
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