QUANTITATIVE RELATIONSHIPS BETWEEN CANOPY SPECTRAL REFLECTANCE AND LEAF STOMATAL CONDUCTANCE IN RICE

doi:10.17521/cjpe.2006.0035

Abstract

Abstract:

This investigation was conducted to determine the quantitative relationship between leaf stomatal conductance and canopy spectral reflectance of rice crops under different water and nitrogen regimes. Results showed that leaf stomatal conductance on main stem leaves under different water treatments decreased in the following order throughout the growth cycle: GsL1 > GsL2 > GsL3 > GsL4. The leaf stomatal conductance in the high nitrogen treatment was higher than in the low nitrogen treatment when the soil water content was above W3. Below W3, there were no significant differences in leaf stomatal conductance between the high and low nitrogen treatments. It also was found that the correlation between the ratio index R(1 650, 760) and stomatal conductance averaged over different layer leaves was the following: GsL1 > GsL12 > GsL123 > GsL1234 > GsL2 > GsL3 > GsL4 (GsL1, GsL2, GsL3, GsL4, GsL12, GsL123 and GsL1234 denoted the first, second, third, fourth leaf and two leaves, three leaves, four leaves from top). The best relationship was between canopy stomatal conductance (the product of GsL1 and LAI) and R(1 650, 760). The ratio index R(1 650, 760) showed a power relationship with both stomatal conductance of L1 and canopy leaf stomatal conductance with an RMSE of 0.05 and 0.24, respectively. It was concluded that the ratio index R can be used to monitor leaf stomatal conductance during different growth stages of rice.

Key words: Rice, Stomatal conductance, Reflectance spectra, Vegetation index, Monitoring

TIAN Yong_Chao, ZHU Yan, YAO Xia, ZHOU Chang_Jun, CAO Wei_Xing. QUANTITATIVE RELATIONSHIPS BETWEEN CANOPY SPECTRAL REFLECTANCE AND LEAF STOMATAL CONDUCTANCE IN RICE[J]. Chin J Plant Ecol, 2006, 30(2): 261-267.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2006.0035

https://www.plant-ecology.com/EN/Y2006/V30/I2/261

Figures/Tables 9

Fig.1 Leaf stomatal conductance in different leaf positions at jointing (A) and filling (B) of rice under varied water treatments

Fig.2 Stomatal conductance on the first leaf from top (A) and canopy ratio index R(1 650,760) (B) at jointing of rice under varied water and nitrogen treatments

Fig.3 Leaf chlorophlly content (SPAD value) on the first leaf from top (A) and canopy leaf water content (B) at jointing of rice under varied water and nitrogen treatments

Fig.4 Leaf area index (LAI) (A) and the second modified SAVI2 (MSAVI2)(B) at jointing of rice under varied water and nitrogen treatments

Table 1 Correlation coefficient between canopy reflectance and leaf stomatal conductance of different leaf layers in rice (n=35)

		GsL1	GsL2	GsL3	GsL4	GsL12	GsL123	GsL1234
R(1 650, 760)	拔节期Jointing	0.88^**	0.63^**	0.32	0.11	0.86^**	0.83^**	0.77^**
	抽穗期Heading	0.86^**	0.68^**	0.30	0.17	0.84^**	0.78^**	0.74^**
	灌浆期Filling	0.87^**	0.66^**	0.28	0.23	0.85^**	0.82^**	0.78^**

Fig.5 Relationship between stomatal conductance of first leaf from top in rice and ratio index R(1 650, 760)

Fig.6 Relationship between canopy leaf stomatal conductance of rice and ratio index R(1 650, 760)

Fig.7 Comparison of measured with predicted stomatal conductance of the first leaf in rice under different soil water and nitrogen conditions

Fig.8 Comparison of measured with predicted canopy leaf stomatal conductance of rice under different soil water and nitrogen conditions

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