期刊
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
卷 408, 期 -, 页码 96-105出版社
ELSEVIER
DOI: 10.1016/j.physa.2014.04.015
关键词
Intrinsic noise; Extrinsic noise; Time delay; Vegetation model; Stochastic resonance
资金
- National Natural Science Foundation of China [11305079]
- Natural Science Foundation of Yunnan Province [2010CD031]
- Key Project of Research Fund of Education Department of Yunnan Province [2001Z011]
In this paper, we investigate the stochastic resonance phenomenon in a vegetation ecological system with time delay, at which the vegetation dynamics is assumed to be disturbed by both intrinsic and extrinsic noises. The signal-to-noise ratio is calculated when a weak periodic signal is added to the system. The impacts of time delay tau and correlation strength k between two noises on the signal-to-noise ratio are discussed, respectively. Our research results show that: (i) the increase of tau or k can enhance the stochastic resonance in the signal-to-noise ratio as a function of intrinsic noise strength alpha: (ii) on the contrary, the increase of tau or k can weaken the stochastic resonance in the signal-to-noise ratio as a function of extrinsic noise strength D; and (iii) the increase of tau can lead to double stochastic resonance phenomenon in the signal-to-noise ratio as a function of k. (C) 2014 Elsevier B.V. All rights reserved.
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