干旱区生态环境知识资源中心

The formation of vegetation patterns in the semi-arid climatic zones is established in the Shnerb's dynamic model. In this paper, the sensitivity and nonlinear instability of the grassland ecosystem to finite-amplitude initial perturbations and parameter perturbations were studied. A useful approach of conditional nonlinear optimal perturbations (CNOPs) was adopted to investigate this nonlinear problem. Research shows that the precipitation rate plays an important role in the prevention and treatment of desert ecosystem. What's more, CNOP which represents the optimal combined pattern of initial and parameter perturbations should be noticed in the management of desert ecosystem.