优化水稻灌溉策略以实现水分生产力最大化——基于AquaCrop模型的扬州盐云灌区模拟研究

IF 1.6 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Monera Mostafa, W. Luo, J. Zou, A. Salem
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引用次数: 0

摘要

采用AquaCrop模型对扬州盐云灌区不同灌溉方式下的水稻产量进行了预测,并在模型模拟的基础上找出了制约水稻生产的制约因素,以实现水分生产力最大化。该模型通过比较2018年生长季节的实测和预测冠层盖度(CC)、产量和土壤含水量进行校准。结果表明,CC模拟的R2为0.99,RMSE为3.6%,NRMSE为5.3%;生物量模拟RMSE为0.50 t/ha, NRMSE为5.3%。对1955 ~ 2014年长期模拟期不同灌溉策略进行了分析。模拟水稻产量初期随灌溉需求的增加而迅速增加,随后逐渐稳定。模拟的水稻产量在不同年份有所波动。采用Pearson - iii型模型方法对湿年、正常年和干年的不同水文年进行了识别。分析确定1991年为湿润年,1981年为正常年,1966年为干旱年。在不同的降雨年(1991年、1981年和1966年),利用水利用效率(WUE)、水生产力(WPet)和灌溉水生产力(IWP)来确定灌溉策略。湿年WPet预测值最高为1.77kg m−3,干年WPet预测值最低为1.13 kg m−3。丰水年IWP最高为19.78 kg m−3,平水年最高为9.32 kg m−3;枯水年最低IWP为1.90 kg m−3。在多雨年份,IWP显著高,WUE显著低。另一方面,丰水年由于产量较高,蒸散发(ET)比干旱年小,因此WPet分布更为广泛。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Optimizing Rice Irrigation Strategies to Maximize Water Productivity: A Simulation Study Using AquaCrop Model for the Yanyun Irrigation District, Yangzhou, China
The AquaCrop model is used to predict rice yield in response to different irrigation management in the Yanyun irrigation area in Yangzhou, China, and the constraints to rice production were identified to maximize water productivity based on model simulations. The model was calibrated by comparing measured and predicted canopy cover (CC), yield, and soil water content during the growing season in 2018. The results showed that, for CC simulations, R2 was 0.99, RMSE was 3.6%, and NRMSE was 5.3%; for Biomass simulation, RMSE was 0.50 t/ha, and NRMSE was 5.3%. Different irrigation strategies were analyzed for a long-term simulation period from 1955 to 2014. The simulated rice yield increased rapidly as irrigation demand increased initially, and then gradually stabilized. The simulated rice yield fluctuated in the different years. The Pearson type-III model method was used to identify different hydrological years of wet, normal, and dry years. The analysis identified the wet year as 1991, normal year as 1981, and dry year as 1966. In the different rainfall years (1991, 1981, and 1966) water use efficiency (WUE), water productivity (WPet), and irrigation water productivity (IWP) were utilized to determine the irrigation strategy. The predicted highest WPet in the wet year was 1.77kg m−3, while the lowest WPet in the dry year was 1.13 kg m−3. The highest IWP was 19.78 kg m−3 in the wet year, and 9.32 kg m−3 in the normal year; while the lowest IWP in the dry year was 1.90 kg m−3. IWP was significantly higher in the rainy year, while WUE was significantly lower. On the other hand, WPet was more extensive in the wet year because the yield was higher, and the Evapotranspiration (ET) was smaller in comparison to the dry year.
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来源期刊
Earth Interactions
Earth Interactions 地学-地球科学综合
CiteScore
2.70
自引率
5.00%
发文量
16
审稿时长
>12 weeks
期刊介绍: Publishes research on the interactions among the atmosphere, hydrosphere, biosphere, cryosphere, and lithosphere, including, but not limited to, research on human impacts, such as land cover change, irrigation, dams/reservoirs, urbanization, pollution, and landslides. Earth Interactions is a joint publication of the American Meteorological Society, American Geophysical Union, and American Association of Geographers.
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