| Response of maize growth and water utilization under plastic mulching in dryland to climate change |
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| DOI：10.7606/j.issn.1000-7601.2020.01.01 |
| Key Words: AquaCrop model global warming winter wheat\|summer maize mulching rotation crop yield evapotranspiration |
| Author Name | Affiliation | | DONG Wenjun | College of Water Resource and Architectural Engineering,Northwest Agricultural and Forest University,Yangling, Shaanxi 712100,China | | LIU Jianfeng | School of Hydraulic Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China | | DING Dianyuan | College of Water Resource and Architectural Engineering,Northwest Agricultural and Forest University,Yangling, Shaanxi 712100,China
School of Hydraulic Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China | | CHEN Ziwei | College of Water Resource and Architectural Engineering,Northwest Agricultural and Forest University,Yangling, Shaanxi 712100,China | | Li Yue | College of Water Resource and Architectural Engineering,Northwest Agricultural and Forest University,Yangling, Shaanxi 712100,China | | Wang Naijiang | College of Water Resource and Architectural Engineering,Northwest Agricultural and Forest University,Yangling, Shaanxi 712100,China | | Feng Hao | College of Water Resource and Architectural Engineering,Northwest Agricultural and Forest University,Yangling, Shaanxi 712100,China
Institute of Water and Soil Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling, Shaanxi 712100,China |
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| Abstract: |
| The applicability of AquaCrop model was calibrated and verified based on the experiment of winter wheat\|summer maize rotation under mulching from October 2013 to June 2016. The effects of climate change on the growth, yield, and water utilization of summer maize were simulated, and the effects of mulching on impact of climate change were analyzed. The results showed that the average annual temperature in Guanzhong (Wugong, Baoji, and Xi’an) increased while the rainfall decreased during the growing seasons. The temperature distributed from high in Baoji to low in Wugong and intermediate in Xi’an, and the rate of temperature increase was 0.20, 0.12℃·10a-1, and 0.09℃·10a-1. The decreases of rainfall in Xi’an, Baoji, and Wugong were 3.59, 3.23 mm, and 2.64 mm 10a-1. The AquaCrop model had good applicability in Guanzhong and simulated the yield, water utilization, and dynamics of crop growth of wheat and maize under mulching. The root mean square error (RMSE) between simulated and measured canopy coverage values ranged from 1.1% to 15.3%, the RMSE of biomass values ranged from 0.626 t·hm-2 to 2.540 t·hm-2, and the RMSE of soil water storage values ranged from 12.6 mm to 47.4 mm.The simulation results showed that temperature was rising since the 1960’s.The growth of summer maize during the growing seasons in Wugong, Baoji, and Xi’an showed a decreasing trend with the reduction as high as 2.76,4.82 d·10a-1, and 5.94 d·10a-1, especially, since the 1980’s. The yield with mulching was higher than that with control, and its coefficient of variation was small under different precipitation year types. Also, the mulching helped obtaining the grain yield and it promoted yield compared with the control under drought climate. Additionally, the mulching effectively reduced the evaporation of soil surface layer during maize seedling stage and conserved more rainfall in soil, which is needed for maize growth in later stage (an average reduction of 7.6 mm). Although mulching increased soil water consumption, it effectively improved water use efficiency of maize by conserving soil water and stabilizing crop yield. The mulching on summer maize in Guanzhong can adapt to climate change effectively and deal with drought climate to a certain extent, it has a good effect of increasing production and stabilizing production. |
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