נגישות
menu      
חיפוש מתקדם
תחביר
חפש...
הספר "אוצר וולקני"
אודות
תנאי שימוש
ניהול
קהילה:
אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Use of a greenhouse as an open chamber for canopy gas exchange measurements: Methodology and validation
Year:
2011
Authors :
אטיאס, מיכאל
;
.
טייטל, מאיר
;
.
כהן, שבתאי
;
.
Volume :
151
Co-Authors:
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
Facilitators :
From page:
1346
To page:
1355
(
Total pages:
10
)
Abstract:
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.
Note:
Related Files :
accuracy assessment
lysimeter
measurement method
MEASUREMENTS
photosynthesis
transpiration
Water vapour flux
עוד תגיות
תוכן קשור
More details
DOI :
10.1016/j.agrformet.2011.05.016
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
29548
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:47
Scientific Publication
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
You may also be interested in