基于多植被指数组合的棉花叶片叶绿素含量估算

doi:10.13866/j.azr.2023.11.16

Abstract

Abstract:

Chlorophyll content is a crucial indicator for characterizing vegetation growth. In this study, we utilized high-spectral technology to rapidly monitor the chlorophyll contents of cotton leaves. We collected 125 cotton leaf seedling samples from Xinjiang and measured their chlorophyll content and spectral data. To achieve this, we employed various spectral preprocessing techniques and used a combination of vegetation indices. Subsequently, we constructed a whale optimization algorithm/random forest regression (WOA-RFR) quantitative inversion model for cotton leaf chlorophyll content. Finally, we conducted a comparative analysis, contrasting the results of the WOA-RFR model with those obtained from the support vector regression (SVR) and RFR models. The results indicated that the spectral transformation methods (logarithm transformation, fractional order differentiation, and wavelet transformation) effectively improved the correlation between the vegetation indices and the chlorophyll content. We also found that the best inversion performance was achieved with the WOA-RFR model using a fractional order differentiation with a transformation order of 0.9 and the Vogelmann3, RVI, DVI, SR_[675-700], Mndvi₇₀₅, ND, VOG1, NVI, TVI, VOG2 combined vegetation indices. The model exhibited R² values of 0.920 and 0.955 for the training set and validation set, respectively. The corresponding RMSE values were 0.987 and 0.986, while the MRE values were 0.013 and 0.014. Compared to the RFR and SVR models, the WOA-RFR model demonstrated higher predictive accuracy, and the optimization effect of the WOA algorithm was evident. As a result, this study provides valuable decision-making support for accurately quantifying cotton leaf chlorophyll content.

Key words: combination of vegetation index, cotton, chlorophyll content, whale optimization algorithm

Areziguli ROZI, Mamat SAWUT, HE Xugang, YE Xiaowen. Estimation of cotton leaf chlorophyll content based on combinations of multi-vegetation indices[J].Arid Zone Research, 2023, 40(11): 1865-1874.

Figures/Tables 9

Fig. 1

Tab. 1

Previously published hyperspectral vegetation indices"

植被指数	计算公式	文献	植被指数	计算公式	文献
GNDVI	$(R 800 - R 500) / (R 800 + R 500)$	[19]	NRI	$(R 570 - R 670) / (R 570 + R 670)$	[20]
PSRI	$(R 678 - R 500) / R 750$	[20]	NPCI	$(R 680 - R 430) / (R 680 + R 430)$	[20]
VARI	$(R 555 - R 680) / (R 580 + R 680 + R 480)$	[21]	RVI	$R 800 / R 680$	[21]
NDVI	$R 800 - R 680 / R 800 + R 680$	[21]	DVI	$R 800 - R 680$	[21]
VOG1	$R 780 / R 740$	[21]	VOG2	$R 734 - R 747 / R 715 - R 726$	[21]
G	$R 780 / R 740$	[23]	Lichtenthaler1	$R 440 / R 690$	[23]
Lichtenthaler2	$(R 800 - R 680) / (R 800 + R 680)$	[23]	SIPI	$(R 800 - R 450) / (R 800 + R 450)$	[23]
PSSRa	$R 800 / R 680$	[23]	Vogelmann1	$(R 734 - R 747) / (R 715 + R 720)$	[23]
Vogelmann3	$R 740 / R 720$	[23]	ND	$(R 935 - R 705) / (R 935 + R 705)$	[23]
CIred edge	$R 750 / R 705 - 1$	[24]	CIgreen	$R 800 / R 550 - 1$	[24]
RI-half	$R 747 / R 708$	[24]	GRVI	$(R 670 / R 500) - 1$	[24]
RDVI	$(R 800 - R 670) / R 800 - R 670$	[25]	Datt1	$(R 850 - R 710) / (R 850 + R 680)$	[25]
Datt2	$R 850 / R 710$	[25]	Datt3	$R 754 / R 704$	[25]
Carte1	$R 695 / R 420$	[25]	Carte2	$R 695 / R 760$	[25]
Carte3	$R 605 / R 760$	[25]	Carte4	$R 710 / R 760$	[25]
SR_[752,690]	$R 752 / R 690$	[25]	SR_[675,700]	$R 675 / R 700$	[25]
NVI	$(R 777 - R 747) / R 673$	[25]	MSR705	$(R 750 - R 445) / (R 705 + R 445)$	[25]
SAVI	$(1 + 0.5) × (R 800 - R 670) / (R 800 + R 670 + 0.5)$				[19]
GARI	$[R 800 - [R 550 - 1.7 × (R 470 - R 670)]] [R 800 + [R 550 - 1.7 × (R 470 + R 670)]]$				[19]
OSAVI	$1.16 × [(R 800 - R 670) / (R 800 + R 670 + 0.16)$ ]				[21]
R_O	红谷(640~680 nm)内反射率最小值				[22]
mND₇₀₅	$(R 750 - R 705) / (R 750 + R 705 - 2 × R 445)$				[24]
EVI	$2.5 × [(R 800 - R 670) / (R 800 + 6 R 670 - 7.5 × R 475 + 1)$				[25]
MCARI	$(R 700 - R 670 - 0.2 × (R 700 - R 550)] × (R 700 / R 670)$				[25]
TVI	$0.5 × 120 × (R 750 - R 550 - 2.5 × R 670 - R 550]$				[25]
MTVI1	$1.2 × 1.2 × (R 800 - R 550 - 2.5 × (R 670 - R 550)$				[25]
REP	$700 + 40 × (R 670 + R 780 / 2 - R 700] / (R 740 - R 700)$				[25]
SPVI	$0.4 × 3.7 × (R 670 - R 550) - 1.2 × R 530 - R 670$				[25]
SPVI2	$0.4 × 3.7 × (R 800 - R 670) - 1.2 × R 550 - R 670$				[25]

Tab. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Tab. 2

Tab. 3

Fig. 6

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光谱变换	植被指数	相关性范围
OR	SAVI，DVI，ND，RDVI，SPVI，SPVI2	0.24~0.26
LogR	VOG1，NDCI，Datt2，ND，RVI，NDVI，GNDVI，PSSRa，CIgreen，carte3	-0.27~-0.37
FD-0.3	SAVI，OSARI，DVI，ND，RDVI，Carte3，Carte4，Carte2，SPVI，SPVI2	-0.28~0.29
FD-0.6	DVI，SPVI2，SAVI，OSARI，EVI，ND，RDVI，Carte2，Carte4，VOG2	-0.33~0.34
FD-0.9	Vogelmann3，RVI，DVI，SR_[675-700]，Mndvi₇₀₅，ND，VOG1，NVI，TVI，VOG2	-0.23~0.30
CWT-3	CIred，PSSRa，MSR₇₀₅，RVI，Lichtenthaler2，VOG1，SIPI，CIgreen，GNDVI，SPVI	-0.27~0.28
CWT-7	REP，MCARI，Vogelmann1，Datt1，GRVI，MTVI1，carte1，Ro，G，NRI	-0.31~0.34

光谱变换	模型算法	建模集			验证集
光谱变换	模型算法	R²	RMSE	MRE	R²	RMSE	MRE
OR	WOA-RFR	0.889	0.014	0.015	0.918	0.050	0.015
	RFR	0.860	1.307	0.019	0.862	1.240	0.018
	SVR	0.756	1.241	0.013	0.908	0.854	0.006
LogR	WOA-RFR	0.912	1.067	0.016	0.894	1.081	0.015
	RFR	0.884	1.367	0.020	0.858	1.280	0.020
	SVR	0.658	1.460	0.015	0.943	0.651	0.006
FD-0.3	WOA-RFR	0.917	1.019	0.014	0.878	1.060	0.016
	RFR	0.872	1.357	0.020	0.850	1.269	0.019
	SVR	0.609	1.569	0.017	0.866	1.035	0.010
FD-0.6	WOA-RFR	0.890	1.085	0.015	0.925	1.008	0.014
	RFR	0.872	1.379	0.019	0.846	1.388	0.021
	SVR	0.451	1.836	0.020	0.685	1.594	0.018
FD-0.9	WOA-RFR	0.920	0.987	0.013	0.955	0.986	0.014
	RFR	0.916	1.250	0.018	0.949	1.207	0.017
	SVR	0.754	1.263	0.013	0.882	0.973	0.010
CWT-3	WOA-RFR	0.895	1.091	0.015	0.922	1.086	0.014
	RFR	0.892	1.388	0.020	0.900	1.443	0.020
	SVR	0.779	1.172	0.010	0.906	0.835	0.007
CWT-7	WOA-RFR	0.934	0.946	0.013	0.911	1.082	0.015
	RFR	0.913	1.286	0.019	0.841	1.281	0.020
	SVR	0.522	1.724	0.019	0.791	1.254	0.009

Estimation of cotton leaf chlorophyll content based on combinations of multi-vegetation indices

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