无人机多光谱参数与Shapley分析融合的青贮玉米生物量估算

doi:10.3864/j.issn.0578-1752.2025.18.005

Abstract

Abstract:

【Objective】Aboveground biomass is an important indicator of crop growth, in order to explore the accuracy difference between single spectral parameter model and fusion of different growth stage models in silage maize above ground biomass (AGB) estimation, this study aimed to compare the effects of unmanned aerial vehicle (UAV) multispectral feature parameters and model fusion methods on silage maize AGB estimation modeling accuracy, so as to improve the accuracy of silage maize biomass monitoring in Ningxia, and to provide a feasible technological solution for silage maize biomass dynamic monitoring. 【Method】DJI UAV M300 RTK equipped with M600 Pro multispectral camera was used to acquire multispectral image data of silage maize at each growth stage under six different nitrogen levels, and the relationship between the spectral reflectance and vegetation index and the change of biomass of silage maize in the upper part of the ground under different treatments were analyzed. The data set of silage maize in the whole life cycle were classified into the nutrient growth stage data set and reproductive growth stage data set, and the correlation analysis of the two different growth stage data sets were carried out. The multispectral vegetation index with high degree of correlation was selected as the input of modeling data, and the AGB estimation model of silage maize at different growth stages were constructed by using machine learning methods, such as Random Forest (RF) and Convolutional Neural Network (BP). The model was optimized by using the Gray Wolf Optimization Algorithm, and finally optimizing the model by using the Shapley Analysis. The optimized AGB estimation model of different growth stages of silage maize was combined to obtain the AGB estimation model of silage maize with multi-spectral change characteristics for the whole reproductive period. 【Result】The division of two different growth stages could improve the correlation between silage maize biomass and multispectral vegetation index, in which the green chlorophyll vegetation index (GCVI) improved with the highest value, and the absolute values of the correlation reached 0.61 and 0.64; the accuracy of the RF model after the combination using Shapley analysis was relatively high, with R² of 0.89 and root mean square error (RMSE) of 1.31 kg·m^-2; The RF model optimized by Gray Wolf algorithm with the Shapley combination had the highest accuracy with R² of 0.92 and RMSE of 1.11 kg·m^-2. 【Conclusion】 In this study, screening the optimal spectral parameters at each growth stage of silage maize and integrating multi-stage modeling using Shapley analysis could effectively improve the accuracy of silage maize AGB prediction model.

Key words: silage maize, above ground biomass, UAV, multispectral, Shapley analysis, machine learning

HAN LinPu, MA JiLong, QI YongJie, GAO JiaQi, XIE TieNa, JIA Biao. Multispectral Unmanned Aerial Vehicle Parameters Combined with Machine Learning to Predict Silage Maize Biomass[J].Scientia Agricultura Sinica, 2025, 58(18): 3632-3647.

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年份 Year	pH	有机质 Organic matter (g·kg^-1)	全氮 Total nitrogen (g·kg^-1)	全磷 Total phosphorus (g·kg^-1)	碱解氮 Alkaline hydrolysis nitrogen (mg·kg^-1)	速效磷 Rapidly available phosphorus (mg·kg^-1)	速效钾 Rapidly available potassium (mg·kg^-1)
2023	7.85	12.75	0.39	0.66	36.75	14.96	98.54
2024	8.19	13.77	0.44	0.78	40.25	15.19	110.42

光谱波段 Spectral band	光谱名称 Spectral name	中心波长 Center wavelength (nm)	波宽 Wave length (nm)	灰板反射率 Gray board reflectance (%)
B1	蓝Blue (B)	450	30	0.60
B2	绿Green (G)	555	27	0.60
B3	红Red (R)	660	22	0.59
B4	红边Red edge (RE)	720	10	0.60
B5	红边750 Red edge 750 (750)	750	10	0.60
B6	近红外Near infrared reflectance (NIR)	840	30	0.60

植被指数 Vegetation index	公式 Formula	参考文献 Reference
绿色归一化差异植被指数 Green normalized difference vegetation index (GNDVI)	$G N D V I=\left(B_{6}-B_{2}\right) /\left(B_{6}+B_{2}\right) $	[18]
归一化差异植被指数 Normalized difference vegetation index (NDVI)	$N D V I=\left(B_{6}-B_{3}\right) /\left(B_{6}+B_{3}\right) $	[19]
修正土壤植被指数 Modified soil vegetation index (MSAVI)	$M S A V I=0.5\left\{2 B_{6}+1-\left[\left(2 B_{6}+1\right)^{2}-8\left(B_{6}-B_{3}\right)\right]^{0.5}\right\}$	[20]
重归一化植被指数 Re-normalized difference vegetation index (RDVI)	$R D V I=\sqrt{\left(B_{6}-B_{3}\right) /\left(B_{6}+B_{3}\right)} $	[21]
优化土壤调节植被指数 Optimized soil adjusted vegetation index (OSAVI)	$O S A V I=1.16\left(B_{6}-B_{3}\right) /\left(B_{6}+B_{3}+0.16\right) $	[22]
红边叶绿素指数 Red edge chlorophyll index (NDREI)	$N D R E I=\left(B_{5}-B_{4}\right) /\left(B_{5}+B_{4}\right) $	[23]
改进简单比值植被指数 Improved simple ratio vegetation index (MSR)	$M S R=\left(B_{5}-B_{4}\right) /\left(B_{4}+B_{3}\right) $	[24]
绿色叶绿素植被指数 Green chlorophyll vegetation index (GCVI)	$G C V I=\mathrm{B}_{6} /\left(\mathrm{B}_{2}-1\right) $	[25]

生长阶段 Growth period	样本数量 Sample number	最大值 Maximum values	最小值 Minimum value	平均值 Average value	标准差 Standard deviation	变异系数 Coefficient of variation
V6—V9	60	7.15	2.66	5.33	1.09	20.58%
V9—V12	60	8.88	4.18	7.11	1.16	16.35%
V12—R1	60	13.47	5.16	9.20	2.44	26.56%
R1—R5	60	18.38	7.43	13.50	3.36	24.93%

模型 Model	V6—V9	V9—V12	V12—R1	R1—R5
随机森林RF	0.31	/	/	0.49
灰狼优化的随机森林 GWO-RF	0.39	/	/	0.52
反向传播神经网络 BP	/	/	/	0.13
灰狼优化的反向传播神经网络 GWO-BP	0.05	/	/	0.24

Multispectral Unmanned Aerial Vehicle Parameters Combined with Machine Learning to Predict Silage Maize Biomass

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生长阶段Growth period	模型Model	R²	RMSE (kg·m^-2)	RPD
营养生长阶段Trophic stage	RF	0.72	0.79	1.39
	GWO-RF	0.79	0.68	1.68
	BP	0.53	1.03	1.05
	GWO-BP	0.54	1.01	1.28
生殖生长阶段Reproductive growth stage	RF	0.88	1.34	2.32
	GWO-RF	0.91	1.13	2.83
	BP	0.75	1.91	1.69
	GWO-BP	0.80	1.71	1.84

时期 Period	模型 Model	R²	RMSE (kg·m^-2)
营养生长阶段模型预测全生育期 Nutritional growth stage modeling to predict the whole period	RF	0.46	1.60
	GWO-RF	0.58	1.39
	BP	0.11	2.04
	GWO-BP	0.18	2.43
生殖生长阶段模型预测全生育期 Reproductive growth stage modeling for predicting the whole period	RF	0.58	1.40
	GWO-RF	0.64	1.20
	BP	0.15	2.03
	GWO-BP	0.38	2.13

模型 Model	营养生长阶段模型权重 Nutritional growth stage model weight	生殖生长阶段模型权重 Reproductive growth stage model weight
Shapley-BP	0.430	0.570
Shapley-GWO-BP	0.469	0.531
Shapley-RF	0.391	0.609
Shapley-GWO-RF	0.439	0.561

时期 Period	模型 Model	R²	RMSE (kg·m^-2)	RPD
全生育期 The whole period	RF	0.79	1.60	1.82
	GWO-RF	0.86	1.36	2.31
	BP	0.65	2.14	1.38
	GWO-BP	0.76	1.82	1.76
全生育期Shapley组合分析 Analysis of Shapley combinations over the whole period	Shapley-RF	0.90	1.21	2.77
	Shapley-GWO-RF	0.93	0.99	3.43
	Shapley-BP	0.80	1.69	2.03
	Shapley-GWO-BP	0.82	1.59	2.27

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