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Project B5


Modelling the spatio-temporal variability of crop and cropping system processes under heterogeneous field conditions

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Research Area:
Crop ecology, environmental physics, quantitative modeling, scaling


project b5

Agricultural fields are characterized by varying degrees of soil heterogeneity which generate unique patterns of water transport regimes within landscapes. How these patterns influence crop growth and resulting latent heat fluxes has not been sufficiently analyzed so far. How can the governing processes be quantified in mathematical models? What model complexity is needed? How can the models be scaled from the point to the patch, field, and regional levels? What importance do processes have at different scales? Which is the best combination between model complexity and scaling approach? These are the central questions which are currently investigated by our group in close collaboration with partners from the TR32 collaborative research center.

We follow a research approach that is characterized by an appropriate balance between experimentation and modeling. To produce high quality data for model development and testing we validated and improved the chamber technique for measuring gas exchange in plant canopies and the heat-balance method for measuring sap-flow in wheat. Both techniques are used to assess the daily and seasonal dynamics of CO2 and H2O flux dynamics in wheat, barley, and sugar-beet at different field locations. Together with information from standard growth analyses, this data is used to describe, model, and scale the effect of soil heterogeneity on crop growth and resulting latent-heat flux.

The ultimate goal of this project is to contribute to the improvement of the vegetation parameterization in the COSMO-CLM-PARFLOW model framework. Ongoing work focuses on the effect of advanced functional type characterization on simulation accuracy.


Cooperation partner:
Wageningen University, The Netherlands

6 Member(s):

Frank Ewert

Prof. Dr.
Frank Ewert
Principal Investigator
in B5

University of Bonn
Institute of Crop Science and
Resource Conservation, INRES

Katzenburgweg 5
53115 Bonn
Germany

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+49 (0)228 73 2871
+49 (0)228 73 2870
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frank.ewert@uni-bonn.de

 

 

Matthias Langensiepen

Prof. Dr.
Matthias Langensiepen
Principal Investigator
in B5

University of Bonn
Institute of Crop Science and
Resource Conservation, INRES

Karlrobert-Kreiten-Str. 13
53115 Bonn
Germany

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+49 (0)228 73 2924
+49 (0)228 73 2489
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matthias@langensiepen.net

 

 

Holger Hoffmann

Dr.
Holger Hoffmann
Scientist
in B5

University of Bonn
Institute of Crop Science and
Resource Conservation, INRES

Katzenburgweg 5
53115 Bonn
Germany

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+49 (0)228 73 2876

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hhoffmann@uni-bonn.de

 

 

cho Miltin Mboh

Dr.
cho Miltin Mboh
Scientist
in B5

University of Bonn
Institute of Crop Science and
Resources Conservation, INRES

Katzenburgweg 5
53115 Bonn
Germany

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icon fax
+49 (0)228 73 2044
+49 (0)228 73 2870
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cmboh@uni-bonn.de

 

 

Huu Thuy Nguyen

Huu Thuy Nguyen
Ph.D. Student
in B5

University of Bonn
Institute of Crop Science and
Resource Conservation, INRES

Katzenburgweg 5
53115 Bonn
Germany

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+49 (0)228 73 2044
+49 (0)228 73 2870
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tngu@uni-bonn.de

 

 

Anja Stadler

Anja Stadler
Ph.D. Student
in B5

University of Bonn
Institute of Crop Science and
Resource Conservation, INRES

Katzenburgweg 5
53115 Bonn
Germany

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icon fax
+49 (0)228 73 7200
+49 (0)228 73 2870
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astadler@uni-bonn.de

 

 


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