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Neural network modeling of ecosystems: A case study on cabbage growth system

文献类型： 外文期刊

作者： Zhang, Wenjun 1 ; Bai, Chanyjun 2 ; Liu, GuoDao 2 ;

作者机构： 1.Zhongshan Univ, Sch Life Sci, Res Inst Entomol, Guangzhou 510275, Peoples R China

2.Zhongshan Univ, Sch Life Sci, Res Inst Entomol, Guangzhou 510275, Peoples R China; Chinese Acad Trop Agr Sci, Hainan 571737, Peoples R China

关键词： neural networks;elman network;linear network;differential equation;modeling;ecosystem;cabbage;NITROGEN;CLASSIFICATION;WATER

期刊名称：ECOLOGICAL MODELLING （ 影响因子：2.974； 五年影响因子：3.264 ）

ISSN：

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收录情况： SCI

摘要： A deep understanding on the intrinsic mechanism is required to develop a highly specialized mechanistic model for ecosystem dynamics. However, it is usually hard to do for most of the ecological and environmental problems, because of the lack of a consistent theoretical background. Neural networks are universal and flexible models for linear and non-linear systems. This paper aimed to modeling an ecosystem using neural network models and the conventional model, and assessing their effectiveness in the dynamic simulation of ecosystem. Elman neural network model, linear neural network model, and linear ordinary differential equation were developed to simulate the dynamics of Chinese cabbage growth system recorded in the field. Matlab codes for these neural network models were given. Sensitivity analysis was conducted to detect the robustness of these models. The results showed that Elman neural network model could simulate the multivariate non-linear system at the desired accuracy. Linear neural network model may simulate such a non-linear system only in certain conditions. Conventional linear ordinary differential equation yielded divergent outputs in the dynamic simulation of the multivariate non-linear system. Sensitivity analysis indicated that the learning rate influenced the simulation performance of linear neural network model. Transfer function of the second layer in Elman neural network model would influence the simulation performance of this model, but little influence was produced when other functions were changed. Elman neural network was proven to be a robust model. Sensitivity analysis showed that the different choices of functions and parameters in neural network model would influence the performance of simulation. Sensitivity analysis is therefore powerful to detect the robustness and stability of neural network models. (c) 2006 Elsevier B.V All rights reserved.

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