数字农科院2.0

Inversion of total photosynthetic area index of oilseed rape based on a multilayer microwave scattering semiempirical model adapted to each phenological stage

文献类型： 外文期刊

作者： Zhao, Rongkun;Wu, Shangrong;Shao, Yun;Wu, Xuexiao;Zha, Yan;Liu, Zhiqu;Liu, Ming;Guo, Yongli;Xia, Lang;Wu, Wenbin;Yang, Peng;Tang, Huajun

作者机构：

关键词： SAR;Oilseed rape;Canopy parameters;Microwave scattering model;Agronomic mechanisms

期刊名称： REMOTE SENSING OF ENVIRONMENT

ISSN： 0034-4257

年卷期： 2025 年 333 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： To accurately invert the canopy parameters (Total photosynthetic area index, TPAI) of oilseed rape, a microwave characteristic layered measurement experiment was designed, and a multilayer microwave scattering semi-empirical model (MLMSSM) was constructed based on the radar response changes induced by the differences in the vertical structure and canopy components at different phenological stages. This model was then applied to the main oilseed rape production areas to conduct regional TPAI inversion. Microwave characteristic layered measurement experiments were performed at six-leaf, flowering, beginning ripening and fully ripening stages of oilseed rape in the laboratory of target microwave properties (LAMP). The MLMSSM was constructed based on the LAMP-measured data, corresponding to different plant structures containing two-and three-layer submodels, and the TPAI inversion model was derived based on the correlation between the MLMSSM parameters and the crop biophysical variables. Finally, regional TPAI inversion and validation were carried out in the main oilseed rape production area (Hengyang), using Sentinel-1 SAR data. Visualization results, MLMSSM parameters and TPAI inversion results based on LAMP data all revealed the occurrence of multiple scattering interactions among distinct oilseed rape structural layers and verified the effectiveness of the measurement scheme and the model. The regional validation results showed high TPAI inversion accuracy throughout entire oilseed rape growth stages, with R2 = 0.78, RMSE = 1.03, and MAE = 0.74 under VV polarization, and R2 = 0.84, RMSE = 0.75, and MAE = 0.52 under VH polarization. The MLMSSM was found to significantly outperform the modified water cloud model (MWCM), increasing R2 by 0.05 and 0.18 under VV and VH polarization respectively, while reducing the RMSE and MAE by 0.49-0.72. These results prove the accuracy and applicability of the MLMSSM for regional TPAI inversion of oilseed rape.

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