Abstract
The calculation and prediction of urban ecological security have a great significance to a city’s sustainable development. So this paper constructs the socioeconomic-natural L-V symbiosis mode in the basis of the Lotka-Volterra symbiosis model. Through analyzing the coefficient of the competition and cooperation in the model, we divide the urban ecological security into five regions: healthy region, sub-healthy region, risky region, high risky region and dangerous region. Then we predict the future ecological security of the city by solving the stable equilibrium point of the model. Finally, in order to evaluate the model’s practical significance, it is used to measure the ecological security of Xi'an, and the final result is in line with the reality of Xi'an.
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