Vegetation nitrogen inversion of typical grassland in Inner Mongolia combined with ASD and UAV hyperspectral

JIN Li-shan; WANG Xiu-mei; DONG Jian-jun; WANG Ruo-chen; WEN He-fei; SUN Yu-yan; WU Wen-bo; ZHANG Zhi-hang; KANG Can

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China Environmental Science ›› 2025, Vol. 45 ›› Issue (5) : 2713-2723.

Environmental Ecology

Vegetation nitrogen inversion of typical grassland in Inner Mongolia combined with ASD and UAV hyperspectral

JIN Li-shan¹, WANG Xiu-mei¹, DONG Jian-jun², WANG Ruo-chen¹, WEN He-fei², SUN Yu-yan¹, WU Wen-bo², ZHANG Zhi-hang¹, KANG Can²

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Abstract

The combination of ground remote sensing and UAV remote sensing was used to estimate the nitrogen content of typical grassland vegetation in Inner Mongolia. This experiment was carried out in the grassland ecology research base of Inner Mongolia University from August to September 2023, and the ground ASD spectral data and UAV Resonon data were collected. Based on ASD data, four spectral parameters of vegetation index, hyperspectral characteristic variable, continuum removal variable and wavelet coefficient were constructed, and LASSO was used to screen sensitive parameters. Five models of multiple linear, XGBoost, SVM, ANN and KNN were constructed to estimate the nitrogen content of vegetation. The results showed that the SVM method based on wavelet coefficients was the optimal model (validation set R² = 0.72, RMSE and MAE were 0.26 and 0.18, respectively). Finally, the model was used to estimate and map the UAV Resonon data (validation set R² = 0.41, RMSE and MAE were 0.42 and 0.32, respectively). The research showed that the combination of ASD and UAV images with machine learning algorithms could be used to realize the estimation of grassland vegetation nitrogen content, and was provided basic data and technical support for optimizing fertilization and improving forage quality.

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hyperspectral / inversion model / nitrogen / typical grassland in Inner Mongolia

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JIN Li-shan, WANG Xiu-mei, DONG Jian-jun, WANG Ruo-chen, WEN He-fei, SUN Yu-yan, WU Wen-bo, ZHANG Zhi-hang, KANG Can. Vegetation nitrogen inversion of typical grassland in Inner Mongolia combined with ASD and UAV hyperspectral[J]. China Environmental Science. 2025, 45(5): 2713-2723

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