| Formation of Vegetation Patterns and Hysteresis Phenomena in Arid and Semiarid Zones |
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| 作者姓名： | 华达银 王烈衍 |
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| 作者单位： | Department of Physics, Ningbo University, Ningbo 315211 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant No 10575055. |
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| 摘 要： | Considering the spatial effect of the complicated interactions between plant and resource （soil water） and the stochastic character of the complicated ecological processes in an ecosystem, we introduce a lattice gas model to investigate the vegetation pattern formation in the arid and the semiarid ecosystems with Monte Carlo sim- ulations. With consistency of some previous mean-field models, the model reproduces a wide range of patterns observed in the arid and the semiarid regions. The sequences of vegetation states are also investigated with scanning three parameters, i.e., the precipitation and the plant growth rate, and then the parameter ranges are identified where a hysteresis loop appears and two different stable states coexist. The simulation results denote that the complex structures occur only when the precipitation parameter decreases. Moreover, based on the model, it is found that an increase of the competition of the plant for the resource along the slope direction results in the regular stripes parallel to the hill＇s contours. The model provides an interesting mechanism to understand the formation of the other regular vegetation stripe in a limited resource condition.
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| 关 键 词： | 干旱地区 植被资源 滞后现象 空间效应 生态系统 |
| 收稿时间： | 2007-08-27 |
Formation of Vegetation Patterns and Hysteresis Phenomena in Arid and Semiarid Zones |
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| HUA Da-Yin,WANG Lie-Yan.Formation of Vegetation Patterns and Hysteresis Phenomena in Arid and Semiarid Zones[J].Chinese Physics Letters,2007,24(12):3586-3589. |
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| Authors: | HUA Da-Yin WANG Lie-Yan |
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| Affiliation: | Department of Physics, Ningbo University, Ningbo 315211 |
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| Abstract: | Considering the spatial effect of the complicated interactions between plant and resource (soil water) and the stochastic character of the complicated ecological processes in an ecosystem, we introduce a lattice gas model to investigate the vegetation pattern formation in the arid and the semiarid ecosystems with Monte Carlo simulations. With consistency of some previousmean-field models, the model reproduces a wide range of patterns observed in the arid and the semiarid regions. The sequences of vegetation states are also investigated with scanning three parameters, i.e., the precipitation and the plant growth rate, and then the parameter ranges are identified where a hysteresis loop appears and two different stable states coexist. The simulation results denote that the complex structures occur only when theprecipitation parameter decreases. Moreover, based on the model, it is found that an increase of the competition of the plant for the resource along the slope direction results in the regular stripes parallel to the hill's contours. The model provides an interesting mechanism to understand the formation of the other regular vegetation stripe in a limited resource condition. |
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| Keywords: | 87 23 Cc 89 75 Kd |
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