Programme  OS3f Regional and nationwide scenarios 2  abstract 434

The impacts of global climate change on irrigation water requirement of wheat in China

Author(s): Junguo Liu, Hong Yang
Dr. Junguo Liu is a researcher at Swiss Federal Institute of Aquatic Science and Technology (EAWAG), P.O. Box 611, Ueberlandstrass133, CH-8600 Duebendorf, Switzerland. His research interests focus on climate change, global water scarcity, water-food relat

Keyword(s): climate change, crop production, China

Article: abs434_article.pdf
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Session: OS3f Regional and nationwide scenarios 2
AbstractIrrigation is by far the largest water user in China. Irrigation water requirement of different crops may greatly

affected by global climate change, but little research has been done in this theme covering the entire China with high

spatial resolution. In this study, a spatial explicit GEPIC (GIS-based Environmental Policy Integrated Climate) model

was used to study the impacts of climate change on irrigation water requirement of wheat with spatial resolution of

30 arc-minutes. Monthly climate change projections were used from the Hadley Centre’s general circulation model,

HadCM3, using scenarios A2a, B2a, and GGa1 for the periods of 1950-1999 and 2070-2099. Projected changes

in monthly precipitation and temperature distributions between the two periods were incorporated into daily weather

series by means of a stochastic weather generator in the GEPIC model. The study points out hotspots with

significantly increasing irrigation water requirement due to climate change. These regions need effective adoption and

mitigation measures in the future to combat water scarcity for secure wheat production.

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