博文
随机扰动和大时间延迟：加速植被生态系统灾难性跃迁
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题目：Noise and large time delay: Accelerated catastrophic regime shifts in ecosystems
作者：Chunhua Zeng, and Hua Wang
摘要：Catastrophic regime shifts (CRS) are large-scale, long-lasting changes in ecosystems. Such regime shifts
can lead to degradation of ecological services and attendant economic losses. In this paper, we study the
impacts of noises and time delay in the vegetation model of grazing ecosystems. We show that the noises
only induce frequent CRS, however the combination of the noises and large time delay lead to permanent
CRS. For small time delay, the mean first-passage time (MFPT) of CRS from the vegetated state to the
desert state as functions of the noise intensities exhibits a maximum, and the noise-enhanced stability
of grazing ecosystems is observed. However for large time delay, the MFPT is monotonically decreasing
functions of the noise intensities, thus the noises accelerate CRS.
can lead to degradation of ecological services and attendant economic losses. In this paper, we study the
impacts of noises and time delay in the vegetation model of grazing ecosystems. We show that the noises
only induce frequent CRS, however the combination of the noises and large time delay lead to permanent
CRS. For small time delay, the mean first-passage time (MFPT) of CRS from the vegetated state to the
desert state as functions of the noise intensities exhibits a maximum, and the noise-enhanced stability
of grazing ecosystems is observed. However for large time delay, the MFPT is monotonically decreasing
functions of the noise intensities, thus the noises accelerate CRS.
该研究成果已被国际著名科学杂志《生态模拟》（Ecological Modelling）登载发表，该期刊2011的IF为2.326。
https://m.sciencenet.cn/blog-761977-600837.html
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