Improving winter wheat yield estimation by assimilation of the leaf area index from Landsat TM and MODIS data into the WOFOST model

文献类型： 外文期刊

第一作者： Huang, Jianxi

作者： Huang, Jianxi;Tian, Liyan;Ma, Hongyuan;Su, Wei;Zhang, Xiaodong;Zhu, Dehai;Liang, Shunlin;Liang, Shunlin;Becker-Reshef, Inbal;Huang, Yanbo;Wu, Wenbin

作者机构：

关键词： Data assimilation;Leaf area index;Scale adjustment;Wheat yield estimation;WOFOST

期刊名称：AGRICULTURAL AND FOREST METEOROLOGY （ 影响因子：5.734； 五年影响因子：5.964 ）

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收录情况： SCI

摘要： To predict regional-scale winter wheat yield, we developed a crop model and data assimilation framework that assimilated leaf area index (LAI) derived from Landsat TM and MODIS data into the WOFOST crop growth model. We measured LAI during seven phenological phases in two agricultural cities in China's Hebei Province. To reduce cloud contamination, we applied Savitzky-Golay (S-G) filtering to the MODIS LAI products to obtain a filtered LAI. We then regressed field-measured LAI on Landsat TM vegetation indices to derive multi-temporal TM LAIs. We developed a nonlinear method to adjust LAI by accounting for the scale mismatch between the remotely sensed data and the model's state variables. The TM LAI and scale-adjusted LAI datasets were assimilated into the WOFOST model to allow evaluation of the yield estimation accuracy. We constructed a four-dimensional variational data assimilation (4DVar) cost function to account for the observations and model errors during key phenological stages. We used the shuffled complex evolution-University of Arizona algorithm to minimize the 4DVar cost function between the remotely sensed and modeled LAI and to optimize two important WOFOST parameters. Finally, we simulated winter wheat yield in a 1-km grid for cells with at least 50% of their area occupied by winter wheat using the optimized WOFOST, and aggregated the results at a regional scale. The scale adjustment substantially improved the accuracy of regional wheat yield predictions (R-2=0.48; RMSE = 151.92 kg ha(-1)) compared with the unassimilated results (R-2 = 0.23; RMSE=373.6 kg ha(-1)) and the TM LAI results (R-2=0.27; RMSE=191.6 kg ha(-1)). Thus, the assimilation performance depends strongly on the LAI retrieval accuracy and the scaling correction. Our research provides a scheme to employ remotely sensed data, ground-measured data, and a crop growth model to improve regional crop yield estimates. (C) 2015 Elsevier B.V. All rights reserved.

分类号： S1

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