滴灌棉花不同生育时期冠层叶片叶绿素含量的高光谱估测模型

doi:10.11963/1002-7807.hslx.20190319

摘要/Abstract

摘要：

【目的】利用高光谱数据对新疆北方地区不同生育时期滴灌棉花冠层叶片叶绿素含量进行估测,建立生长时序的叶绿素含量估算模型。【方法】以新陆早45号为试验材料,测定不同施氮水平和生育时期棉花冠层叶片叶绿素含量及对应的光谱反射率,分析了12种指数与叶绿素含量的关系,构建了滴灌棉花冠层叶片叶绿素含量的估测模型。【结果】棉花的4个生育时期（现蕾期、盛蕾期、花铃期和吐絮期）中冠层叶片叶绿素含量与Vogelmann红边指数1的相关系数都高,分别是0.944、0.907、0.895、0.930;采用多元回归方法建立的模型精度高于单指数线性模型,其决定系数都大于0.8,且均方根误差（RMSE）都较小。现蕾期模型（y=82.509x₁+89.937x₂-94.438）精度最好。【结论】针对不同生育时期建立的模型均可对棉花冠层叶片叶绿素含量进行估测,其中现蕾期模型监测效果最好。

关键词: 棉花; 高光谱; 叶绿素含量; 光谱指数

Abstract:

[Objective] This article is aimed to estimate the chlorophyll content of cotton canopy leaves in drip irrigation fields at different growth stages in northern Xinjiang and establish a model for estimating chlorophyll content in growth time series by using hyperspectral. [Method] Using Xinluzao 45 as the experimental material, the chlorophyll content and the corresponding spectral reflectance of cotton canopy leaves at different nitrogen levels and growing stages were measured, and the relationship between 12 indices and the chlorophyll content was analyzed. The estimation models of the chlorophyll content in cotton canopy leaves under drip irrigation were established. [Result] The correlation coefficient between the chlorophyll content of canopy leaves and Vogelmann red edge index was high in the four growing periods of cotton, and the correlation coefficient was 0.944, 0.907, 0.895, 0.930, respectively. And the spectral reflectivity was the highest at the flowering and boll period. The precision of the model established by the multivariate regression method is higher than that of the single exponential linear model with the determination coefficient more than 0.8 and the root mean square error smaller than that of the single exponential linear model. The model of the budding stage (y=82.509x₁+89.937x₂-94.438) has the best precision. [Conclusion] The chlorophyll content can be estimated by the models established at different growth stages, and the budding stage model has the best monitoring effect.

Key words: cotton; hyperspectral; chlorophyll content; spectral parameters

洪帅,张泽,张立福,马露露,海兴岩,王振,张辉,吕新. 滴灌棉花不同生育时期冠层叶片叶绿素含量的高光谱估测模型[J]. 棉花学报, 2019, 31(2): 138-146.

Hong Shuai,Zhang Ze,Zhang Lifu,Ma Lulu,Hai Xingyan,Wang Zhen,Zhang Hui,Lü Xin. Hyperspectral Estimation Model of Chlorophyll Content in Cotton Canopy Leaves under Drip Irrigation at Different Growth Stages[J]. Cotton Science, 2019, 31(2): 138-146.

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链接本文: http://journal.cricaas.com.cn/Jweb_mhxb/CN/10.11963/1002-7807.hslx.20190319

http://journal.cricaas.com.cn/Jweb_mhxb/CN/Y2019/V31/I2/138

图/表 7

表1

光谱指数计算公式"

光谱指数 Spectral index	缩写 Abbreviation	计算公式 Computational formula	文献来源 References
比值植被指数 Ratio vegetation index	RVI	R₇₈₀/R₆₉₀	[16]
Vogelmann红边指数1 Red edge index 1	VOG₁	R₇₈₀/R₇₄₀	[18]
Vogelmann红边指数2 Red edge index 2	VOG₂	（R₇₃₄-R₇₄₇）/（R₇₁₅+R₇₂₆）	[18]
线性内插法红边位置 Red edge position: linear interpolation method	REIP	700+40×[（R₆₇₀+R₇₈₀）/2-R₇₀₀]/（R₇₄₀-R₇₀₀）	[19]
转换叶绿素吸收反射率指数 Transformed chlorophyll absorption reflectance index	TCARL	3×[（R₇₀₀-R₆₇₀）-0.2×（R₇₀₀-R₅₅₀）]（R₇₀₀/R₆₇₀）	[20]
改进叶绿素吸收反射率指数 Modified chlorophyll absorption reflectance index	MCARL	[（R₇₀₀-R₆₇₀）-0.2×（R₇₀₀-R₅₅₀）]（R₇₀₀/R₆₇₀）	[21]
红边一阶导数光谱最大值 Maximum of the first derivative spectral in red edge area	D_r	波长680~760 nm内（红边）一阶导数光谱最大值 Maximum of the first derivative spectra in wavelength 680-760 nm (red edge)	[22]
红边一阶导数光谱的积分 Integral of the first derivative spectra in red edge area	S_Dr	波长680~760 nm内（红边）一阶导数光谱的积分 Integral of the first derivative spectra in wavelength 680-760 nm (red edge)	[22]
蓝边一阶导数光谱最大值 Maximum of the first derivative spectral in blue edge area	D_b	波长490~530 nm内（蓝边）一阶导数光谱最大值 Maximum of the first derivative spectra in wavelength 490-530 nm (blue edge)	[22]
蓝边一阶导数光谱的积分 Integral of the first derivative spectra in blue edge area	S_Db	波长490~530 nm内（蓝边）一阶导数光谱的积分 Integral of the first derivative spectra of wavelength 490-530 nm (blue edge)	[22]
绿峰红谷反射率比值 Ratio between green peak reflectance and red valley reflectance	R_g/R_r	绿峰反射率（R_g）与红谷反射率（R_r）的比值 Ratio between green peak reflectance (R_g) and red valley reflectance (R_r)	[22]
绿峰红谷反射率归一化值 Normalized reflectance of green peak and red valley	（R_g-R_r）/（R_g+R_r）	绿峰反射率（R_g）与红谷反射率（R_r）的归一化值 Normalized values of green peak reflectance (R_g) and red valley reflectance (R_r)	[22]

表1

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图2

表2

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表4

图3

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光谱指数 Spectral index	现蕾期 Budding stage	盛蕾期 Flourishing budding stage	花铃期 Flowering and boll period	吐絮期 Boll opening stage
RVI	0.657	0.357	-0.793	0.022
VOG₁	0.944^*	0.907^*	0.895^*	0.930^*
VOG₂	-0.595	-0.856	-0.917^*	-0.425
REIP	0.748	0.820	0.779	0.208
TCARL	-0.481	-0.667	-0.812	0.022
MCARL	-0.481	-0.667	-0.812	0.022
D_r	-0.295	-0.865	-0.851	-0.414
S_Dr	-0.341	-0.841	-0.902^*	-0.442
D_b	-0.392	-0.840	-0.799	0.900^*
S_Db	-0.406	-0.839	0.805	-0.850
R_g/R_r	0.487	-0.280	-0.143	-0.789
（R_g-R_r）/（R_g+R_r）	0.477	-0.293	-0.140	-0.793

生育时期 Growth stages	模型类型 Types of models	回归方程 Regression equation	决定系数 R²	均方根误差 RMSE
现蕾期	R-RVI	y=0.225 7x-0.261 6	0.432	0.16
Budding stage	R-VOG₁	y=60.18x-67.646	0.892	0.07
	R-REIP	y=1.196 1x-860.61	0.595	0.15
	R-MSR	y=82.509x₁+89.937x₂-94.438	0.988	0.02
盛蕾期Flourishing budding stage	R-VOG₁	y=8.049 2x-7.768 2	0.823	0.06
	R-VOG₂	y=-2.033 8x+0.863 6	0.732	0.08
	R-D_r	y=-101.9x+3.279 8	0.748	0.07
	R-MSR	y=8.049x₁-7.768	0.823	0.06
花铃期 Flowering and boll period	R-VOG₁	y=25.34x-28.06	0.801	0.17
	R-VOG₂	y=-5.786x-0.641 1	0.842	0.15
	R-S_Dr	y=-309.63x+6.372 4	0.814	0.16
	R-MSR	y=-3.565x₁-177.527x₂+2.868	0.985	0.05
吐絮期 Boll opening stage	R-VOG₁	y=14.930x-15.821	0.864	0.07
	R-D_b	y=-1 265.1x+3.283 5	0.810	0.08
	R-S_Db	y=-1 148x+3.114	0.723	0.10
	R-MSR	y=14.930x₁-15.821	0.864	0.07

模型 Models	决定系数R²	均方根误差 RMSE
现蕾期 Budding stage	0.843 0	0.11
盛蕾期 Flourishing budding stage	0.764 2	0.06
花铃期 Flowering and boll period	0.783 8	0.19
吐絮期 Boll opening stage	0.620 6	0.13