Water use efficiency of winter wheat based on DNDC model in Daxing District Beijing
QIAO Shuaishuai1,2,3, WEI Zheng1,2*, ZHANG Baozhong1,2, HU Zhenhua3
1.National Center of Efficient Irrigation Engineering and Technology Research-Beijing, Beijing 100048, China; 2.State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; 3.College of Forestry, Shanxi Agricultural University, Taigu, Shanxi 030801, China
In order to elucidate the spatial-temporal variation trend of agricultural water efficiency in winter wheat in Daxing District, a DNDC(denitrification and decomposition)model of winter wheat was worked out based on winter wheat yield statistics and remote sensing ET values in the district. The applicability of the model was verified to the water productivity of winter wheat in the district. It was shown that the simulated winter wheat yield and ET were in better accuracy as low as less than 4.2% relative error, and the water productivity of the plant was 1.91 and 1.75 kg/m3, respectively. In regional simulation and verification, the yield and ET of winter wheat in different soil areas varied, but the same overall trend remained. The yield depended largely on rainfall, and reached the maximum in 2008. The average annual yield in 2007—2016 was 5 227 kg/hm2, and the simulated average yield was 4 845 kg/hm2. During the same period, the average value of ET simulated in the district was 381.74 mm, and the average value from remote sensing was 392.66 mm with a less than 13% average relative error. The WP value simulated was in 1.10-1.62 kg/m3 in 2007 to 2016 with a mean of 1.27 kg/m3, while the statistic value was in 1.15-1.62 kg/m3 with a statistic mean of 1.34 kg/m3.
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