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• W2013991534 abstract "• ET c of summer maize showed a significant downward trend during 1960–2009 in the HHH farming region. • The variation of ET aw did not drop significantly due to yearly fluctuation of the effective rainfall in the growing season. • ET c was higher in the eastern regions and lower in the western in the HHH farming region. • The decrease of solar radiation contributed most to the decrease of the summer maize ET c . Crop water requirement and the temporal and spatial changes of this important characteristic provide key information for irrigation scheduling, water resource planning, and future decision-making. In the Huang-Huai-Hai (HHH) farming region in north China, both crop evapotranspiration ( ET c ) and evapotranspiration of the applied water ( ET aw ) in the growing season of summer maize during 1960–2009 were calculated using the SIMETAW (simulation of evapotranspiration of applied water) model and the daily weather data. Inverse distance weighted interpolation (IDW) was used to interpret spatial distribution of ET c and ET aw . Results showed that: (1) During 1960–2009 in the HHH farming region, ET c of summer maize during the growing season showed a significant downward trend; the average ET c decreased from 335.6 mm/decade in the period 1960–1969 to 311.4 mm/decade in the period 2000–2009. The variation of ET aw of summer maize during the growing season did not drop significantly due to yearly fluctuation of the effective rainfall ( R e ) in the growing season, and the improvement of irrigation efficiency and cultivation management measures. Although the descent of ET c might mitigate the agricultural water stress in this area to some extent, the variation of ET aw still depended on the effective rainfall. (2) The average ET c values per decade presented higher in the eastern and lower in the western regions; inter-regional differences were observed for ET aw , and the highest ET aw value of about 109.6 mm was found in the western regions of the Shandong and Hebei Provinces. Adjusting irrigation system and adopting the different irrigation systems in different region should be taken into consideration to guarantee the maize yield in this area. (3) During 1960–2009, a significant overall increase in temperature, a significant decrease in wind speed, humidity, and solar radiation, and a slight decrease in precipitation were observed. The solar radiation decrease contributed most to the summer maize ET c decrease, while relative humidity and precipitation were negatively correlated with ET c ." @default.
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• W2013991534 date "2013-06-01" @default.
• W2013991534 modified "2023-10-18" @default.
• W2013991534 title "Impact of climate change on the water requirement of summer maize in the Huang-Huai-Hai farming region" @default.
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• W2013991534 doi "https://doi.org/10.1016/j.agwat.2013.03.017" @default.
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