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| Titel |
Influence of ecohydrologic feedbacks from simulated crop growth on integrated regional hydrologic simulations under climate scenarios |
| VerfasserIn |
P. E. V. Walsum, I. Supit |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 6 ; Nr. 16, no. 6 (2012-06-01), S.1577-1593 |
| Datensatznummer |
250013321
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| Publikation (Nr.) |
 copernicus.org/hess-16-1577-2012.pdf |
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| Zusammenfassung |
| Hydrologic climate change modelling is hampered by climate-dependent model
parameterizations. To reduce this dependency, we extended the regional
hydrologic modelling framework SIMGRO to host a two-way coupling between the
soil moisture model MetaSWAP and the crop growth simulation model WOFOST,
accounting for ecohydrologic feedbacks in terms of radiation fraction that
reaches the soil, crop coefficient, interception fraction of rainfall,
interception storage capacity, and root zone depth. Except for the last,
these feedbacks are dependent on the leaf area index (LAI). The influence of
regional groundwater on crop growth is included via a coupling to MODFLOW.
Two versions of the MetaSWAP-WOFOST coupling were set up: one with exogenous
vegetation parameters, the "static" model, and one with endogenous crop
growth simulation, the "dynamic" model. Parameterization of the static and
dynamic models ensured that for the current climate the simulated long-term
averages of actual evapotranspiration are the same for both models.
Simulations were made for two climate scenarios and two crops: grass and
potato. In the dynamic model, higher temperatures in a warm year under the
current climate resulted in accelerated crop development, and in the case
of potato a shorter growing season, thus partly avoiding the late summer
heat. The static model has a higher potential transpiration; depending on
the available soil moisture, this translates to a higher actual
transpiration. This difference between static and dynamic models is enlarged
by climate change in combination with higher CO2 concentrations.
Including the dynamic crop simulation gives for potato (and other annual
arable land crops) systematically higher effects on the predicted recharge
change due to climate change. Crop yields from soils with poor water
retention capacities strongly depend on capillary rise if moisture supply
from other sources is limited. Thus, including a crop simulation model in an
integrated hydrologic simulation provides a valuable addition for hydrologic
modelling as well as for crop modelling. |
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