数字农科院2.0

Improving crop yield estimation by unified model parameters and state variable with Bayesian inference

文献类型： 外文期刊

作者： Jianjian Song;Jianxi Huang;Hai Huang;Guilong Xiao;Xuecao Li;Li Li;Wei Su;Wenbin Wu;Peng Yang;Shunlin Liang

作者机构：

关键词： Bayesian inference;Crop yield estimation;Data assimilation;Ensemble Kalman filter;WOFOST model

期刊名称： Agricultural and Forest Meteorology

ISSN： 0168-1923

年卷期： 2024 年 355 卷

页码：

收录情况： SCIE（2024版）

摘要： Data assimilation techniques integrating crop growth models and remote sensing technologies offer a feasible approach for large-scale crop yield estimation. Previous research has primarily focused on either recalibrate the uncertain model parameters or updating model state variables independently using remotely sensed observations. In this study, we developed a two-step inference algorithm that couples the parameter inference and the state update, to solve the joint posterior distribution of uncertain parameters and state variables given the remote sensing observations. An Observing Simulation System (OSS) experiment was first performed based on the WOFOST crop model to validate the effectiveness of the parameter inference method. The results indicate that, the parameter inference method successfully improved the estimation of different types of model parameters and enhanced yield estimation. Furthermore, leaf area index (LAI) retrieved from Sentinel-2 was assimilated into the WOFOST model to simulate winter wheat yield at the plot scale in the northeastern part of Henan Province. The results demonstrated that the proposed two-step inference algorithm can more effectively correct model simulation biases and improve winter wheat yield estimation accuracy (R²=0.58, MAPE=12.75 %, and RMSE=1112 kg·ha⁻¹), outperforming the standard EnKF algorithm (R²=0.51, MAPE=14.62 %, RMSE=1328 kg·ha⁻¹). Overall, attributed to its unified approach to estimating both model parameters and state variables, the proposed two-step inference algorithm shows promising application prospects for data assimilation-based crop yield estimation.

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