基于可见光光谱和BP人工神经网络的冬小麦生物量估算研究

doi:10.3964/j.issn.1000-0593(2015)09-2596-06

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Abstract The objective of this study was to evaluate the feasibility of using color digital image analysis and back propagation (BP) based artificial neural networks (ANN) method to estimate above ground biomass at the canopy level of winter wheat field. Digital color images of winter wheat canopies grown under six levels of nitrogen treatments were taken with a digital camera for four times during the elongation stage and at the same time wheat plants were sampled to measure above ground biomass. Canopy cover (CC) and 10 color indices were calculated from winter wheat canopy images by using image analysis program (developed in Microsoft Visual Basic). Correlation analysis was carried out to identify the relationship between CC, 10 color indices and winter wheat above ground biomass. Stepwise multiple linear regression and BP based ANN methods were used to establish the models to estimate winter wheat above ground biomass. The results showed that CC, and two color indices had a significant correlation with above ground biomass. CC revealed the highest correlation with winter wheat above ground biomass. Stepwise multiple linear regression model constituting CC and color indices of NDI and b, and BP based ANN model with four variables (CC, g, b and NDI) for input was constructed to estimate winter wheat above ground biomass. The validation results indicate that the model using BP based ANN method has a better performance with higher R² (0.903) and lower RMSE (61.706) and RRMSE (18.876) in comparation with the stepwise regression model.

Key words： Winter wheat Visible spectrum Color indices Canopy cover Above ground Biomass BP based artificial neural networks

Received: 2014-07-31 Accepted: 2014-10-29

ZTFLH:	S126
	S512.1

Corresponding Authors: FU Jin-dong E-mail: fujindong@caas.cn

Cite this article:

CUI Ri-xian,LIU Ya-dong,FU Jin-dong. Estimation of Winter Wheat Biomass Using Visible Spectral and BP Based Artificial Neural Networks [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(09): 2596-2601.

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http://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2015)09-2596-06 OR http://www.gpxygpfx.com/EN/Y2015/V35/I09/2596

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