Field in Situ Spectral Inversion of Cotton Organic Matter Based on Soil Water Removal Algorithm

De-fang LUO; Wei-yang LIU; Jie PENG; Chun-hui FENG; Wen-jun JI; Zi-jin BAI

doi:10.3964/j.issn.1000-0593(2022)01-0222-07

Spectroscopy and Spectral Analysis, Volume. 42, Issue 1, 222(2022)

Field in Situ Spectral Inversion of Cotton Organic Matter Based on Soil Water Removal Algorithm

De-fang LUO^1、*, Wei-yang LIU^{1、1; *;}, Jie PENG^1、1;, Chun-hui FENG^1、1;, Wen-jun JI^2、2;, and Zi-jin BAI^1、1;

Author Affiliations

¹1. College of Plant Sciences, Tarim University, Alar 843300, China

²2. College of Land Resources Management, China Agricultural University, Beijing 100083, China

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Figures & Tables(6)

Fig. 1. Schematic diagram of the study area

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Fig. 2. Dry-spectral (a) and Situ-spectral (b) of soil with different average organic matter contents

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Fig. 3. Scatter plots of soil organic matter content predicted by different models

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Table 1. Statistics of soil samples
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Table 1. Statistics of soil samples
项目样本数平均值最大值最小值标准差变异系数/%
土壤有机质/(g·kg^-1) 115 10.74 20.26 4.23 3.27 30.44
土壤水分/% 115 15.39 55.25 7.36 4.43 28.81

Table 2. Accuracy of soil organic matter models in different mathematical forms

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Table 2. Accuracy of soil organic matter models in different mathematical forms

模型		R²	RMSE/ (g·kg^-1)	RPD	MAPE
RF	Dry spectra	0.87	1.59	2.38	0.15
	Situ spectra	0.71	2.13	1.78	0.20
	Dry-R'-spectra	0.90	1.54	2.46	0.14
	Situ-R'-spectra	0.73	2.08	1.82	0.16
	Dry-1/R-spectra	0.81	1.85	2.04	0.16
	Situ-1/R-spectra	0.70	2.18	1.73	0.20
	Dry-LOG(R)-spectra	0.88	1.65	2.29	0.15
	Situ-LOG(R)-spectra	0.73	1.99	1.90	0.17

Table 3. Accuracy of soil organic matter prediction model under different treatment forms

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Table 3. Accuracy of soil organic matter prediction model under different treatment forms

模型		R²	RPD	RMSE/ (g·kg^-1)	MAPE
RF	EPO-situ spectra	0.80	1.73	2.18	0.16
	EPO-R'-situ spectra	0.83	2.35	1.61	0.15
	EPO-LOG(R)-situ spectra	0.82	2.20	1.72	0.16
	DS-situ spectra	0.81	2.09	1.75	0.17
	DS-R'-situ spectra	0.83	2.35	1.63	0.16
	DS-LOG(R)-situ spectra	0.81	2.17	1.74	0.17
	PDS-situ spectra	0.76	2.08	1.84	0.19
	PDS-R'-situ spectra	0.78	1.90	1.99	0.19
	PDS-LOG(R)-situ spectra	0.80	2.06	1.84	0.17

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De-fang LUO, Wei-yang LIU, Jie PENG, Chun-hui FENG, Wen-jun JI, Zi-jin BAI. Field in Situ Spectral Inversion of Cotton Organic Matter Based on Soil Water Removal Algorithm[J]. Spectroscopy and Spectral Analysis, 2022, 42(1): 222

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