| 引用本文: | 魏 强,张吴平,吴亚楠,等.基于SEBAL模型的小麦水分生产率研究[J].灌溉排水学报,2017,36(7):. |
| WEI Qiang,ZHANG Wuping,WU Ya’nan,et al.基于SEBAL模型的小麦水分生产率研究[J].灌溉排水学报,2017,36(7):. |
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| 摘要: |
| 基于能量平衡原理，运用 SEBAL模型和Landsat8影像反演估算了山西省晋中市的小麦水分生产率。首先根据Landsat8卫星影像，反演了晋中地区净辐射通量、土壤热通量和感热通量，使用能量平衡方程计算了水分蒸散；然后基于晋中小麦的产量统计数据，对晋中小麦的产量进行插值并栅格化；最后利用水分生产率公式计算了研究区小麦水分生产率。结果表明，研究区内的太谷、榆社、介休3站点反演的日蒸散量分别为2.93、3.82、3.17 mm/d，范围为0.41～7.22 mm/d，与根据Penman-Monteith公式计算的结果 ( 2.57、3.48、3.43 mm/d )大致相等，误差范围在10%左右；研究区小麦水分生产率均值为0.94 kg/m3，最高达到2.50 kg/m3，处于合理范围内，可以对晋中地区提高水分利用效率提供有效参考。 |
| 关键词: 模型； 小麦； 水分生产率； 蒸散量 |
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| Investigating Water Productivity for Winter Wheat Using the SEBAL Model |
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WEI Qiang, ZHANG Wuping, WU Ya’nan, SUN Jinghua
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College of resources and environment, Shanxi Agricultural University, Taigu 030801, China
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| Abstract: |
| The surface energy balance algorithm for land (SEBAL) model is a model developed based on land surface energy balance. It was used in this paper to estimate water productivity for winter wheat in Jinzhong City, Shanxi Province of China. We first calculated net radiation flux, soil heat flux, sensible heat flux based on the Landsat8 images and then estimated the evapotranspiration (ET) from them. Crop growth and production were obtained from statistical database and they were then rasterized in the central Shanxi Province. The water productivity for winter wheat was calculated using measured yield and estimated ET. The results showed that the daily ET as from 0.41 to 7.22 mm/d. The accuracy of the model was assessed by comparing the daily ET cal culated from the SEBAL model with that calculated from the Penman-Monteith equation. The estimated ET at Taigu, Yushe and Jiexiu using the Penman-Monteith formula was 2.57, 3.48, 3.43 mm/d respectively, while the ET calculated from the SEBAL model for the three locations was 2.93, 3.82, 3.17 mm/d respectively, with a maximum deviation of approximately 10%. The average and maximum water productivity in the studied area was 0.94 kg/m3 and 2.50 kg/m3 respectively, which are rational. The model therefore provides a guidance for improving water use efficiency in central Shanxi Province. |
| Key words: SEBAL model； wheat； water productivity； evapotranspiration |
