Application of the Conditional Nonlinear Optimal Perturbations Method in a Theoretical Grassland Ecosystem

用曾等建议的一个简化非线性地理论的草地生态系统，我们与线性地稳定的草地(荒芜或潜伏的沙漠)说的 .The 结果表演能转与有限振幅非线性地不稳定的有条件的非线性的最佳的不安( CNOP )的途径学习敏感和草地生态系统的非线性的不稳定性到有限振幅的起始的不安 降水在之间的起始的 perturbations.When 二分叉指，大

Using a simplified nonlinearly theoretical grassland ecosystem proposed by Zeng et al.,we study the sensitivity and nonlinear instability of the grassland ecosystem to finiteamplitude initial perturbations with the approach of conditional nonlinear optimal perturbation （CNOP）.The results show that the linearly stable grassland （desert or latent desert） states can turn to be nonlinearly unstable with finite amplitude initial perturbations.When the precipitation is between the two bifurcation points,a large enough finite amplitude initial perturbation can induce a transition between the grassland statethe desert state or the latent desert.