Spectral Characteristics During Leaf Flourishing Development of Quercus Mongolica and Its Influencing Factors

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Fig. 1. Comparisons of spectral reflectance (a) and first derivative spectra (b) of Quercus mongolica canopy under long photoperiod treatments

Fig. 2. Comparisons of spectral reflectanceand (a) first derivative spectra (b) of Quercus mongolica canopy under controlled photoperiod treatments

Fig. 3. Comparisons of spectral reflectance (a) and first derivative spectra (b) of Quercus mongolica canopy under short photoperiod treatments

处理	NDVI	ChlNDI	PRI	红边斜率	红边位置	红边面积
T1L1N1	0.747	0.229	-0.067	0.016	698	0.484
T1L1N3	0.803	0.340	-0.040	0.015	700	0.533
T2L1N1	0.781	0.297	-0.044	0.013	699	0.436
T2L1N3	0.811	0.361	-0.057	0.011	701	0.403
T3L1N1	0.760	0.343	-0.052	0.014	700	0.513
T3L1N3	0.787	0.266	-0.107	0.014	699	0.435

Table 1. Canopy spectral indexesandred edge parameters of Quercus mongolica under long photoperiod treatments

处理	NDVI	ChlNDI	PRI	红边斜率	红边位置	红边面积
T1L2N1	0.738	0.316	-0.023	0.013	700	0.470
T1L2N3	0.769	0.336	-0.038	0.013	700	0.448
T2L2N1	0.814	0.364	-0.042	0.014	700	0.497
T2L2N3	0.813	0.354	-0.046	0.012	700	0.426
T3L2N1	0.823	0.357	-0.047	0.013	700	0.456
T3L2N3	0.826	0.360	-0.028	0.013	700	0.490

Table 2. Canopy spectral indexesand red edge parameters of Quercus mongolica under controlled photoperiod treatments

处理	NDVI	ChlNDI	PRI	红边斜率	红边位置	红边面积
T1L3N1	0.705	0.342	-0.016	0.012	701	0.456
T1L3N3	0.754	0.358	-0.020	0.012	701	0.463
T2L3N1	0.822	0.385	-0.015	0.014	700	0.547
T2L3N3	0.781	0.350	-0.015	0.011	700	0.414
T3L3N1	0.753	0.255	-0.019	0.015	695	0.487
T3L3N3	0.825	0.404	-0.003	0.013	701	0.500

Table 3. Canopy spectral indexes of Quercus mongolica and red edge parameters under short photoperiod treatments

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