RELATIONSHIP BETWEEN DERIVATIVE SPECTRA AND PHOTOSYNTHETIC ORGAN AREA IN RAPESEED (BRASSICA NAPUS)

doi:10.3773/j.issn.1005-264x.2008.03.016

Abstract

Abstract:

Aims Crop canopy reflectance, especially derivative spectrum, is a promising prospect for nondestructive rapid estimation of crop photosynthetic organ area and evaluation of crop growth status and yields. The purpose of our experiment was to investigate the quantitative relationships between derivative spectral parameters and photosynthetic organ area.

Methods We used field experiments to study leaf area index (LAI), pod area index (PAI) and canopy hyperspectra reflectance of rapeseed (Brassica napus) under different nitrogen levels and in different cultivars and determined quantitative relationships between derivative spectral parameters and photosynthetic organ area.

Important findings The correlation coefficient between photosynthetic organ area and derivative spectra was higher than that of canopy spectral reflectance of single band, with the best correlation at 750 nm (r=0.9). The correlation sequence of “three-edge parameters" to photosynthetic organ area was red edge>yellow edge>blue edge, area parameters>amplitude parameters>position parameters. Phenomenon of “two peak" at red edge of rape canopy spectra weakened the sensitivity of red edge position ( REP) to changes of biophysical parameters, but REP extracted from linear extrapolation method (REP(le)) strengthened it. Red edge area (SDr) and difference of SDr and blue edge area (SDb) (DSDr,b) from “three-edge parameters" and their derived parameters had the best correlation with LAI and PAI, and they were suitable for the different cultivars used in this study. Therefore, derivative spectral parameters, i.e., first derivative spectrum at 750 nm, SDr and DSDr,b could be used to effectively monitor area of photosynthetic organs in rapeseed.

Key words: derivative spectra, rapeseed (Brassica napus), photosynthetic organ area, correlation analysis

JU Chang-Hua, TIAN Yong-Chao, ZHU Yan, YAO Xia, CAO Wei-Xing. RELATIONSHIP BETWEEN DERIVATIVE SPECTRA AND PHOTOSYNTHETIC ORGAN AREA IN RAPESEED (BRASSICA NAPUS)[J]. Chin J Plant Ecol, 2008, 32(3): 664-672.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2008.03.016

https://www.plant-ecology.com/EN/Y2008/V32/I3/664

Figures/Tables 9

References 20

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分类 Classification	光谱参数 Spectral parameter	定义 Definition
特征导数光谱 Characteristic derivative spectra	导数光谱 fd_λ	特征波段λ处的一阶导数值 First derivative spectral value at the position of characteristic wavelength λ
三边参数 Three-edge parameters	蓝边振幅 Db	蓝边490~530 nm内一阶导数光谱中的最大值 Maximum value of first derivative spectra within blue edge area 490-530 nm
	蓝边位置 BEP	Db对应的波长位置 Wavelength position of Db (nm)
	蓝边面积 SDb	蓝边波长范围内一阶导数波段值的总和 Sum of first derivative values within blue edge area
	黄边振幅 Dy	黄边550~580 nm内一阶导数光谱中的最大值 Maximum value of first derivative spectra within yellow edge area 550-580 nm
	黄边位置 YEP	Dy对应的波长位置 Wavelength position of Dy (nm)
	黄边面积 SDy	黄边波长范围内一阶导数波段值的总和 Sum of first derivative values within yellow edge area
	红边振幅 Dr	红边680~755 nm内一阶导数光谱中的最大值 Maximum value of first derivative spectra within red edge area 680-755 nm
	红边位置 REP	Dr对应的波长位置 Wavelength position of Dr (nm)
	红边面积 SDr	红边波长范围内一阶导数波段值的总和 Sum of first derivative value within red edge area
特征导数光谱衍生参数 Parameters derived from characteristic derivative spectra	导数光谱差 Dfd_(λ1,λ2)	fd_λ1 - fd_λ2
	导数光谱比 Rfd_(λ1,λ2)	fd_λ1/fd_λ2
	归一化导数光谱差 NDfd_(λ1,λ2)	(fd_λ1 - fd_λ2)/(fd_λ1 + fd_λ2)
三边参数衍生参数 Parameters derived from three-edge parameter	红蓝边振幅差 DDr,b	Dr-Db
	红蓝边振幅比 RDr,b	Dr/Db
	归一化红蓝边振幅差 NDDr,b	(Dr-Db)/(Dr+Db)
	红蓝边面积差 DSDr,b	SDr-SDb
	红蓝边面积比 RSDr,b	SDr/SDb
	归一化红蓝边面积差 NDSDr,y	(SDr - SDb)/(SDr + SDb)
	红黄边振幅差 DDr,y	Dr-Dy
	红黄边振幅比 RDr,y	Dr/Dy
	归一化红黄边振幅差 NDDr,y	(Dr-Dy)/(Dr+Dy)
	红黄边面积差 DSDr,y	SDr-SDy
	红黄边面积比 RSDr,y	SDr/SDy
	归一化红黄边面积差 NDSDr,y	(SDr-SDy)/(SDr+SDy)

分类 Classification	光谱参数 Spectral parameter	定义 Definition
特征导数光谱 Characteristic derivative spectra	导数光谱 fd_λ	特征波段λ处的一阶导数值 First derivative spectral value at the position of characteristic wavelength λ
三边参数 Three-edge parameters	蓝边振幅 Db	蓝边490~530 nm内一阶导数光谱中的最大值 Maximum value of first derivative spectra within blue edge area 490-530 nm
	蓝边位置 BEP	Db对应的波长位置 Wavelength position of Db (nm)
	蓝边面积 SDb	蓝边波长范围内一阶导数波段值的总和 Sum of first derivative values within blue edge area
	黄边振幅 Dy	黄边550~580 nm内一阶导数光谱中的最大值 Maximum value of first derivative spectra within yellow edge area 550-580 nm
	黄边位置 YEP	Dy对应的波长位置 Wavelength position of Dy (nm)
	黄边面积 SDy	黄边波长范围内一阶导数波段值的总和 Sum of first derivative values within yellow edge area
	红边振幅 Dr	红边680~755 nm内一阶导数光谱中的最大值 Maximum value of first derivative spectra within red edge area 680-755 nm
	红边位置 REP	Dr对应的波长位置 Wavelength position of Dr (nm)
	红边面积 SDr	红边波长范围内一阶导数波段值的总和 Sum of first derivative value within red edge area
特征导数光谱衍生参数 Parameters derived from characteristic derivative spectra	导数光谱差 Dfd_(λ1,λ2)	fd_λ1 - fd_λ2
	导数光谱比 Rfd_(λ1,λ2)	fd_λ1/fd_λ2
	归一化导数光谱差 NDfd_(λ1,λ2)	(fd_λ1 - fd_λ2)/(fd_λ1 + fd_λ2)
三边参数衍生参数 Parameters derived from three-edge parameter	红蓝边振幅差 DDr,b	Dr-Db
	红蓝边振幅比 RDr,b	Dr/Db
	归一化红蓝边振幅差 NDDr,b	(Dr-Db)/(Dr+Db)
	红蓝边面积差 DSDr,b	SDr-SDb
	红蓝边面积比 RSDr,b	SDr/SDb
	归一化红蓝边面积差 NDSDr,y	(SDr - SDb)/(SDr + SDb)
	红黄边振幅差 DDr,y	Dr-Dy
	红黄边振幅比 RDr,y	Dr/Dy
	归一化红黄边振幅差 NDDr,y	(Dr-Dy)/(Dr+Dy)
	红黄边面积差 DSDr,y	SDr-SDy
	红黄边面积比 RSDr,y	SDr/SDy
	归一化红黄边面积差 NDSDr,y	(SDr-SDy)/(SDr+SDy)

	叶面积指数 Leaf area index (LAI)		角果皮面积指数 Pod area index (PAI)
	2月22日 22 Feb.	3月4日 4 Mar.	3月14日 14 Mar.		3月25日 25 Mar.	4月27日 27 Apr.	5月2日 2 May
氮水平 Nitrogen level	N0	0.21^a	0.28^a	0.60^a	0.80^a	1.08^a	1.13^a
	N1	0.75^b	0.64^a	1.27^ab	1.53^a	1.79^b	1.62^b
	N2	1.38^c	1.44^b	1.94^b	2.52^b	2.35^c	2.03^b
	N3	1.79^c	1.83^b	3.89^c	4.14^c	2.76^d	3.08^c
处理 Treatment	F	21.37	28.08	28.5	35.79	40.63	32.1
	F_0.01	6.99	5.42	5.42	5.42	5.42	5.42

	叶面积指数 Leaf area index (LAI)		角果皮面积指数 Pod area index (PAI)
	2月22日 22 Feb.	3月4日 4 Mar.	3月14日 14 Mar.		3月25日 25 Mar.	4月27日 27 Apr.	5月2日 2 May
氮水平 Nitrogen level	N0	0.21^a	0.28^a	0.60^a	0.80^a	1.08^a	1.13^a
	N1	0.75^b	0.64^a	1.27^ab	1.53^a	1.79^b	1.62^b
	N2	1.38^c	1.44^b	1.94^b	2.52^b	2.35^c	2.03^b
	N3	1.79^c	1.83^b	3.89^c	4.14^c	2.76^d	3.08^c
处理 Treatment	F	21.37	28.08	28.5	35.79	40.63	32.1
	F_0.01	6.99	5.42	5.42	5.42	5.42	5.42

油菜叶面积指数LAI		角果皮面积指数PAI
光谱参数 Spectral parameter	相关系数 Correlation coefficient	光谱参数 Spectral parameter	相关系数 Correlation coefficient		光谱参数 Spectral parameter	相关系数 Correlation coefficient	光谱参数 Spectral parameter	相关系数 Correlation coefficient
Db	0.648^**	SDy	-0.751^**	Db	-0.112	SDy	-0.357^*
BEP	0.342^**	Dr	0.816^**	BEP	0.112	Dr	0.725^**
SDb	0.572^**	REP	0.489^**	SDb	-0.199	REP	0.192
Dy	-0.747^**	SDr	0.822^**	Dy	-0.280	SDr	0.756^**
YEP	0.302^**	REP(le)	0.803^**	YEP	-0.234	REP(le)	0.768^**
DDr,b	0.824^**	DSDr,b	0.826^**	DDr,b	0.785^**	DSDr,b	0.796^**
DDr,y	0.811^**	DSDr,y	0.819^**	DDr,y	0.698^**	DSDr,y	0.728^**
RDr,b	0.784^**	RSDr,b	0.788^**	RDr,b	0.778^**	RSDr,b	0.783^**
RDr,y	0.174	RSDr,y	-0.310^**	RDr,y	0.666^**	RSDr,y	0.526^**
NDDr,b	0.734^**	NDSDr,b	-0.684^**	NDDr,b	0.763^**	NDSDr,b	0.759^**
NDDr,y	-0.206	NDSDr,y	-0.476^**	NDDr,y	0.670^**	NDSDr,y	0.506^**