[750] - The influence of leaf photosynthetic efficiency and stomatal closure on canopy carbon uptake and evapotranspiration - A model study in wheat and sugar beet

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Schickling, A., Graf, A., Pieruschka, R., Plückers, C., Geiß, H., Lai, I., Schween, J., Erentok, K., Schmidt, M., Wahner, A., Crewell, S., Rascher, U., 2010. The influence of leaf photosynthetic efficiency and stomatal closure on canopy carbon uptake and evapotranspiration - A model study in wheat and sugar beet. Biogiosciences Discussions, 7, 7131 - 7172. DOI: 10.5194/bgd-7-7131-2010.
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Title(s):Main Title: The influence of leaf photosynthetic efficiency and stomatal closure on canopy carbon uptake and evapotranspiration - A model study in wheat and sugar beet
Description(s):Abstract: In this study two crop species, winter wheat (Triticum aestivum) and sugar beet (Beta vulgaris), were monitored over the course of five days during the entire season. We investigated the link of the main physiological leaf-level mechanisms, stomatal conductance and efficiency of photosynthetic energy conversion on canopy transpiration and photosynthetic CO2 uptake. The physiological status of 900 leaves of different plants in a natural canopy was characterized on the leaf level using chlorophyll fluorescence. Gas exchange measurements were performed at leaves of 12 individual plants of each species. Eddy covariance flux measurements provided information on CO2, water and energy fluxes on the field scale. The diurnal pattern of stomatal resistance on the leaf level was especially for sugar beet similar to the canopy resistance, which indicates that stomatal resistance may have a large impact on the bulk canopy resistance. The diurnal changes in canopy resistance appeared to have less effect on the evapotranspiration, which was mainly dependent on the amount of incoming radiation. The similar diurnal pattern of water use efficiency on the leaf level and on the canopy level during the day, underline the influence of physiological mechanisms of leaves on the canopy. The greatest difference between water use efficiency on leaf and canopy occurred in the morning, mainly due to an increase of stomatal resistance. Limitation of CO2 uptake occurred in the afternoon when water vapor pressure deficit increased. Maxima of net ecosystem productivity corresponded to the highest values of photosynthetic capacity of single leaves, which occurred before solar noon. Within the course of a few hours, photosynthetic efficiency and stomatal resistance of leaves varied and these variations were the reason for diurnal variations in the carbon fluxes of the whole field. During the seasonal development, the leaf area index was the main factor driving carbon and water exchange, when both crops were still growing. During senescence of winter wheat these structural parameters did not account for changes in canopy fluxes and remaining high green leaf material of sugar beet did not present the reduction in canopy fluxes due to beginning dormancy. We thus hypothesize that the functional status of plants is also important to correctly predict carbon and water fluxes throughout the season. We propose to additionally include the physiological status of plants in carbon flux models in order to improve the quality of the simulation of diurnal patterns of carbon fluxes.
Identifier(s):DOI: 10.5194/bgd-7-7131-2010
Responsible Party
Creator(s):Author: Anke Schickling
Author: Alexander Graf
Author: Roland Pieruschka
Author: Christine Plückers
Author: Heiner Geiß
Author: I-Ling Lai
Author: Jan Schween
Author: Kaya Erentok
Author: Marius Schmidt
Author: Andreas Wahner
Author: Susanne Crewell
Author: Uwe Rascher
Publisher:European Geosciences Union
TR32 Topic:Vegetation
Subject(s):CRC/TR32 Keywords: Sugar Beet, Photosynthetic Efficiency, Carbon, Evapotranspiration, Winter Wheat, Crop/s, CO2
File Details
File Name:2010_Schickling_Biogeosciences.pdf
Data Type:Text
Size(s):41 Pages
File Size:8673 kB (8.47 MB)
Date(s):Date Accepted: 2010-08-26
Issued: 2010-09-24
Mime Type:application/pdf
Data Format:PDF
Download Permission:OnlyTR32
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:TR32DB Data policy agreement
Measurement Region:RurCatchment
Measurement Location:--RurCatchment--
Specific Informations - Publication
Article Type:Journal
Source:Biogiosciences Discussions
Number Of Pages:41
Page Range:7131 - 7172
Metadata Details
Metadata Creator:Anke Schickling
Metadata Created:2013-12-03
Metadata Last Updated:2013-12-03
Funding Phase:1
Metadata Language:English
Metadata Version:V40
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