| 光谱学与光谱分析 |
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| Fast Catalogue of Alien Invasive Weeds by Vis/NIR Spectroscopy |
| YU Jia-jia1, ZOU Wei1, HE Yong1*, XU Zheng-hao2* |
1. College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310029, China
2. Institute of Environment and Resource, Zhejiang University, Hangzhou 310029, China |
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Abstract The feasibility of visible and short-wave near-infrared spectroscopy (VIS/WNIR) techniques as means for the nondestructive and fast detection of alien invasive weeds was evaluated. Selected sensitive bands were found validated. In the present study, 3 kinds of alien invasive weeds, Veronica persica, Veronica polita, and Veronica arvensis Linn, and one kind of local weed, Lamiaceae amplexicaule Linn, were employed. The results showed that visible and NIR (Vis/NIR) technology could be introduced in classification of the alien invasive weeds or local weed with the similar outline. Thirty×4 weeds samples were randomly selected for the calibration set, while the remaining 20×4 samples for the prediction set. Smoothing methods of moving average and standard normal variate (SNV) were used to pretreat spectra data. Based on principal components analysis, soft independent models of class analogy (SIMCA) were applied to make the model. Four frontal principal components of each catalogues were applied as the input of SIMCA, and with a significance level of 0.05, recognition ratio of 78.75% was obtained. The average prediction result is 90% except for Veronica polita. According to the modeling power of each spectra data in SIMCA, some possible sensitive bands, 496-521, 589-626 and 789-926 nm, were founded. By using these possible sensitive bands as the inputs of least squares support vector machine (LS-SVM), and setting the result of LS-SVM as the object function value of genetic algorithm (GA), mutational rate, crossover rate and population size were set up as 0.9, 0.5 and 50 respectively. Finally, recognition ratio of 95.63% was obtained. The prediction results of 95.63% indicated that the selected wavelengths reflected the main characteristics of the four weeds, which proposed a new way to accelerate the research on cataloguing alien invasive weeds.
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Received: 2008-12-03
Accepted: 2009-04-18
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Corresponding Authors:
HE Yong
E-mail: yhe@zju.edu.cn;640909@zju.edu.cn
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