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| Titel |
Crop yields response to water pressures in the Ebro basin in Spain: risk and water policy implications |
| VerfasserIn |
S. Quiroga, Z. Fernández-Haddad, A. Iglesias |
| 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 ; 15, no. 2 ; Nr. 15, no. 2 (2011-02-09), S.505-518 |
| Datensatznummer |
250012640
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| Publikation (Nr.) |
 copernicus.org/hess-15-505-2011.pdf |
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| Zusammenfassung |
| The increasing pressure on water systems in the Mediterranean enhances
existing water conflicts and threatens water supply for agriculture. In this
context, one of the main priorities for agricultural research and public
policy is the adaptation of crop yields to water pressures. This paper
focuses on the evaluation of hydrological risk and water policy implications
for food production. Our methodological approach includes four steps. For
the first step, we estimate the impacts of rainfall and irrigation water on
crop yields. However, this study is not limited to general crop production
functions since it also considers the linkages between those economic and
biophysical aspects which may have an important effect on crop productivity.
We use statistical models of yield response to address how hydrological
variables affect the yield of the main Mediterranean crops in the Ebro river
basin. In the second step, this study takes into consideration the effects
of those interactions and analyzes gross value added sensitivity to crop
production changes. We then use Montecarlo simulations to characterize crop
yield risk to water variability. Finally we evaluate some policy scenarios
with irrigated area adjustments that could cope in a context of increased
water scarcity. A substantial decrease in irrigated land, of up to 30%
of total, results in only moderate losses of crop productivity. The response
is crop and region specific and may serve to prioritise adaptation
strategies. |
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