The study of crop water requirements (CWR) under climate change is critical for reasonable crop irrigation. In the present study, the effects of changes in climatic variables from 1961 to 2010 on maize CWR in Huang–Huai–Hai (HHH) watersheds in China were investigated. Five daily climatic factors including maximum temperature (Tmax), minimum temperature (Tmin), wind speed (u2), sunshine hours (nsun), and relative humidity (RH) from 121 weather stations during the maize growing season were studied. The Penman–Monteith method was employed to calculate crop evapotranspiration (ETc), and the spatiotemporal distribution characteristics of ETc and climatic factors were investigated via singular value decomposition. Results showed that the ETc of spring maize slightly increased by 0.4% during the past 50 years, which was primarily caused by the increase in Tmax. The ETc of summer maize decreased by 10.5%, which was primarily caused by the decrease in nsun and u2. Overall, the ETc followed the same spatiotemporal change trend as those of Tmax, nsun, and u2 in the HHH, whereas no coexisting spatiotemporal change between ETc and RH, as well as Tmin, was observed. This result suggests that changes in Tmax, nsun, and u2 are the main climatic factors that influence maize CWR in the HHH.
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Research Article|
December 27 2013
Effects of changes in climatic variables on maize crop water requirements in Huang–Huai–Hai watersheds, China
Xinli Mou;
Xinli Mou
1School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China
2School of Chemical and Environmental Engineering, Chongqing Three Gorges University, Wanzhou 404100, China
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Xinghui Xia;
1School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China
E-mail: [email protected]
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Daoyi Gong;
Daoyi Gong
3State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China
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Qiang Liu;
Qiang Liu
1School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China
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Qiong Wu;
Qiong Wu
1School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China
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Jia Guo
Jia Guo
1School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China
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Journal of Water and Climate Change (2014) 5 (2): 176–191.
Article history
Received:
April 30 2013
Accepted:
November 23 2013
Citation
Xinli Mou, Xinghui Xia, Daoyi Gong, Qiang Liu, Qiong Wu, Jia Guo; Effects of changes in climatic variables on maize crop water requirements in Huang–Huai–Hai watersheds, China. Journal of Water and Climate Change 1 June 2014; 5 (2): 176–191. doi: https://doi.org/10.2166/wcc.2013.064
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