Global Sensitivity Analysis of Summer Maize Water Productivity in North China

YU Ying-duo, CHEN Hua-tang, WEI Zheng, ZHANG Bao-zhong

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China Rural Water and Hydropower ›› 2019 ›› (9) : 43-48.

Global Sensitivity Analysis of Summer Maize Water Productivity in North China

  • YU Ying-duo1,2 ,CHEN Hua-tang3 ,WEI Zheng1,2 ,ZHANG Bao-zhong1,2
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Abstract

It is essential to quantify the parameters' sensitivity to improve the crop water productivity. Summer maize is used as the research object so as to investigate the parameters' sensitivity in different soils,meteorology and tillage measures of summer maize water productivity. The extended Fourier amplitude test is used as the analysis method. Research results show that the DNDC model can effectively simulate the soil moisture and crop growth process with 0~ 50 cm soil moisture,ETc,crop growth process and yield. Irrigation water volume, initial soil ammonium concentration,CO2 concentration,the second fertilization amount,rainfall and daily maximum temperature are factors which can limit summer maize water productivity in different hydrological years. When the hydrological age is changed from flood year to flat year and then to low flow year,the sensitivity of the irrigation water is higher than that of the fertilization amount. Therefore,the sensitivity of the limiting factor will be helpful to improve the regional agricultural water production efficiency and multi-elements,and thus enhancing the technical approach.

Key words

water use efficiency / global sensitivity / model / DNDC / maize

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YU Ying-duo, CHEN Hua-tang, WEI Zheng, ZHANG Bao-zhong. Global Sensitivity Analysis of Summer Maize Water Productivity in North China. China Rural Water and Hydropower. 2019, 0(9): 43-48

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