半干旱环境下植被-沙模型的斑图动力学

Pattern Dynamics of a Vegetation-Sand Model in Semi-Arid Environments

植被斑图可以揭示植被在时空上的分布规律,对植被保护具有重要意义。研究了一类典型的半干旱多风沙环境下植被-沙动力学模型,分析了该模型产生稳态斑图的数学条件,揭示了对流会诱导植被斑图从不规则斑纹转变为规则的条状斑图,进而可能导致荒漠化的出现。本研究可为植被斑图的相变提供新的可能性机制。

Vegetation pattern can reveal the spatial and temporal distribution of vegetation,therefore,it is of great significance to protect vegetation.In this paper,a typical vegetation-sand dynamic model under semi-arid and windy sand environment is studied,and the mathematical conditions for the steady-state patterns generated by the model are analyzed.It is revealed that convection induces the transformation of vegetation patterns from irregular patterns to regular stripes,which may leads to the emergence of desertification.This work provides a new possible mechanism for the phase transformation of vegetation patterns.