Spectral Angles of Plant Leaves as Indicators of Uranium Pollution in Soil

Wei-hong WANG; Xue-gang LUO; Feng-qiang WU; Ling LIN; Jun-jie LI

doi:10.3964/j.issn.1000-0593(2022)04-1313-05

Journals >Spectroscopy and Spectral Analysis >Volume 42 >Issue 4 >Page 1313 > Article

Spectroscopy and Spectral Analysis
Vol. 42, Issue 4, 1313 (2022)

Spectral Angles of Plant Leaves as Indicators of Uranium Pollution in Soil

Wei-hong WANG^{1; 2; *;}, Xue-gang LUO^{1; 3;}, Feng-qiang WU^{1; 2;}, Ling LIN^{1; 2;}, and Jun-jie LI^{1; 2;}

Author Affiliations

1. Environment and Resource College, Southwest University of Science and Technology, Mianyang 621010, China

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DOI: 10.3964/j.issn.1000-0593(2022)04-1313-05 Cite this Article

Wei-hong WANG, Xue-gang LUO, Feng-qiang WU, Ling LIN, Jun-jie LI. Spectral Angles of Plant Leaves as Indicators of Uranium Pollution in Soil[J]. Spectroscopy and Spectral Analysis, 2022, 42(4): 1313 Copy Citation Text

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实验植物	实验设计时选择的生长期
苎麻	苗期	开花期	成熟期
印度芥菜	苗期	开花期	成熟期^*
酸模	苗期	旺盛期	成熟期
油菜	苗期	蕾薹期	成熟期
玉米	苗期	开花期	成熟期^*

Table 1. The selected growth periods of measuring spectra

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标称测量范围	实际测量范围	波长准确度	光谱分辨率	仪器采样间隔
350~2 500 nm	334.3~2 535.9 nm	5 nm	≤3.5 nm(350~1 000 nm); ≤22 nm(1 000~2 500 nm)	0.2~1.6 nm(350~1 000 nm), 平均1.5 nm 6~6.4 nm(1 000~2 500 nm)

Table 2. Main technical parameters of PSR-2500 spectrometer

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实验植物	生长期	波段区间
实验植物	生长期	350~716 nm	717~975 nm	976~1 265 nm	1 266~1 770 nm	1 771~2 500 nm
	苗期	100%	100%	100%	100%	100%
苎麻	开花期	81.0%	90.5%	90.5%	95.2%	100%
	成熟期	95.2%	90.5%	23.8%	23.8%	28.6%
印度芥菜	苗期开花期	95.2% 90.5%	95.2% 90.5	90.5% 81.0%	90.5% 95.2%	90.5% 95.2%
	苗期	100%	81.0%	95.2%	81.0%	85.7%
酸模	旺盛期	100%	81.0%	100%	90.5%	95.2%
	成熟期	90.5%	100%	90.5%	100%	100%
	苗期	95.2%	100%	90.5%	90.5%	100%
油菜	蕾薹期	100%	95.2%	95.2%	95.2%	100%
	成熟期	90.5%	95.2%	81.0%	100%	90.5%
玉米	苗期开花期	90.5% 90.5%	95.2% 95.2%	100% 100%	81.0% 81.0%	100% 90.5%

Table 3. Proportions of spectral angles greater than threshold values of experimental plants under soil uranium pollution (%)

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实验植物	生长期	波段区间
实验植物	生长期	350~716 nm	717~975 nm	976~1 265 nm	1 266~1 770 nm	1 771~2 500 nm
苎麻	苗期	0.921^**	0.935^**	0.760^*		0.709^*
印度芥菜	苗期开花期	0.798^*	0.902^**	0.862^**
酸模	旺盛期成熟期	0.842^**		0.771^*		0.751^*
油菜	苗期蕾薹期	0.917^** 0.804^*	0.740^* 0.835^**			0.755^* 0.909^**
玉米	苗期开花期	0.768^*	0.763*	0.835^**	0.795^* 0.730^*

Table 4. Correlations between spectral angles of experimental plants and uranium contents in soil

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植物-生长期	线性回归方程	R²	p值	F值	RMSE
苎麻-苗期	Y=-52.038+62.037×T_波段1+3 592.58×T_波段2+1 832.4×T_波段3	0.92	0.013	15.89	4.56
印度芥菜-苗期	Y=-174.74+150.607×T_波段1+11 727.65×T_波段3	0.74	0.033	7.27	8.18
印度芥菜-开花期	Y=-82.38+7 191.35×T_波段2	0.81	0.002	26.32	9.70
酸模-旺盛期	Y=-105.44+757.03×T_波段1	0.71	0.008	14.58	7.35
酸模-成熟期	Y=-205.45+384.44×T_波段3+7743.83×T_波段5	0.78	0.021	9.10	7.51
油菜-蕾薹期	Y=-354.687+11 914.16×T_波段5	0.83	0.001	28.49	6.72
玉米-苗期	Y=-264.94+10 813.37×T_波段1	0.59	0.023	8.60	10.70
玉米-开花期	Y=-206.64-4 536.73×T_波段2+20 491.2×T_波段3	0.70	0.049	15.78	8.85

Table 5. Linear regression equations between soil uranium contents and spectral angles of experimental plants

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铀处理浓度	苎麻	印度芥菜	酸模	油菜	玉米
25	4.23±0.4	14.84±0.2	4.98±1.2	25.69±1.2	3.45±0.3
75	8.23±2.1	22.31±2.1	6.26±2.1	38.05±3.2	3.73±0.2
125	11.40±0.8	42.40±3.4	8.19±1.2	48.55±9.2	2.93±0.3
175	15.38±5.6	67.00±4.5	9.16±2.1	56.58±8.3	5.93±0.4
275	19.12±5.1	72.51±7.9	10.62±3.2	65.66±19.2	6.89±2.2
375	22.12±3.4	82.38±11.2	14.47±2.6	76.99±22.1	7.99±2.1
485	80.80±19.1	95.62±21.4	14.89±3.2	91.01±18.1	8.29±3.2

Table 6. Uranium contents in leaves of experimental plants under different treatment concentrations

Wei-hong WANG, Xue-gang LUO, Feng-qiang WU, Ling LIN, Jun-jie LI. Spectral Angles of Plant Leaves as Indicators of Uranium Pollution in Soil[J]. Spectroscopy and Spectral Analysis, 2022, 42(4): 1313

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