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| DOI：10.13522/j.cnki.ggps.20190039 |
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| Trend of Net Irrigation Water Requirement of Wheat-maize Rotation in North China-A Case Study of Daxing District |
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WEI Tongtong, PENG Zhigong, LIU Fusheng, ZHANG Baozhong, ZHANG Peng, DU Lijuan, ZHANG Qian
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1.College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Taian 271018, China; 2. State key Laboratory of Watershed Water cycle Simulation and Regulation,China Institute of Water Resources and Hydropower Research, Beijing 100038, China
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| Abstract: |
| 【Objective】 This paper is intended to provide a decision-making reference for future agricultural water planning. 【Method】 In this paper, Mann-Kendall nonparametric test was used to analyze the changes of crop water requirement, effective precipitation and net irrigation water requirement in wheat-maize rotation for 60 years (1961—2017) and nearly 30 years (1988—2017). 【Result】 1961―2017, the water requirement and effective precipitation of wheat-maize rotation crops increased significantly at the rates of 5.3 mm/10 a and 7.8 mm/10 a respectively, while the net irrigation water requirement decreased slightly at the rate of 18.3 mm/10 a. In the past 30 years, the water requirement of wheat-maize rotation crops increased significantly at the rate of 11.0 mm/10 a, the effective precipitation decreased significantly at the rate of -7.3 mm/10 a, and the net irrigation water requirement increased significantly at the rate of 18.3 mm/10 a. 【Conclusion】 There were large differences in the trends of the different time series. The decrease of net irrigation water requirement in recent 60 years was mainly due to the decrease of average wind speed and sunshine hours，although the increase in the past 30 years was mainly due to the increase of air temperature and the decrease of relative humidity. The shorter the sequence was, the more significant the change trend was. Therefore, it was very important to choose the sequence length reasonably when planning irrigation water use. |
| Key words: wheat-maize rotation; crop water requirement; effective precipitation; net irrigation water requirement; M-K trend test |
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