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| Titel |
Measurements and simulations of water transport in maize plants |
| VerfasserIn |
Florian Heinlein, Christian Klein, Christoph Thieme, Eckart Priesack |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250148126
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| Publikation (Nr.) |
 EGU/EGU2017-12357.pdf |
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| Zusammenfassung |
| In Central Europe climate change will become manifest in the increase of extreme weather
events like flash floods, heat waves and summer droughts, and in a shift of precipitation
towards winter months. Therefore, regional water availability will alter which has an effect on
future crop growth, water use efficiency and yields. To better estimate these effects
accurate model descriptions of transpiration and other parts of the water balance are
important.
In this study, we determined transpiration of four maize plants on a field of the research
station Scheyern (about 40km North of Munich) by means of sap flow measurement devices
(ICQ International Pty Ltd, Australia) using the Heat-Ratio-Method: two temperature probes,
0.5 cm above and below a heater, detect a heat pulse and its speed which facilitates the
calculation of sap flow. Additionally, high resolution changes of stem diameters were
measured with dendrometers (DD-S, Ecomatik). The field was also situated next to
an eddy covariance station which provided latent heat fluxes from the soil-plant
system.
We also performed terrestrial laser scans of the respective plants to extract the plant
architectures. These structures serve as input for our mechanistic transpiration model
simulating the water transport within the plant. This model, which has already been
successfully applied to single Fagus sylvatica L. trees, was adapted to agricultural plants such
as maize. The basic principle of this model is to solve a 1-D Richards equation along the
graph of the single plants. A comparison between the simulations and the measurements is
presented and discussed. |
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