Regular and irregular patterns in semiarid vegetation
Regular and irregular patterns in semiarid vegetation
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DOI：
10.1126/science.284.5421.1826
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发表时间：
1999-06-11
期刊：
影响因子：
56.9
通讯作者：
Klausmeier, CA
中科院分区：
文献类型：
--
作者：
Klausmeier, CA
许多半干旱地区的植被具有惊人的图案，在山坡上形成规则的条纹，在平地上形成不规则的马赛克。一个简单的植物和水动力学模型的基础上生态现实的假设和合理的参数值捕捉这两种类型的模式。规则的格局是由图灵式的不稳定性引起的;不规则的格局是由生态动力学放大了微小的小尺度地形变化引起的。由于观测结果与这些理论结果之间的密切一致，该系统提供了一个明确的例子，说明非线性机制如何在确定植物群落的空间结构中发挥重要作用。
Vegetation in many semiarid regions is strikingly patterned, forming regular stripes on hillsides and irregular mosaics on fiat ground. A simple model of plant and water dynamics based on ecologically realistic assumptions and with reasonable parameter values captures both of these types of patterns. The regular patterns result from a Turing-like instability; the irregular patterns arise when the ecological dynamics amplify slight small-scale topographic variability. Because of the close agreement between observations and these theoretical results, this system provides a clear example of how nonlinear mechanisms can be important in determining the spatial structure of plant communities.