基于L-V共生模型的区域生态安全测度研究

Study on regional ecological security measure based on L-V symbiosis model

区域生态安全与区域可持续发展息息相关。根据共生理论,构建社会经济—自然L—V共生模型,运用DPSIR模型对其基本指数和协同系数进行测算。为避免人为因素干扰,测算中,用聚类分析法、变异系数法以及熵权法建立指标体系并赋权重,使整个测度过程定量化,同时,对该模型的稳定平衡点和协同系数进行动态分析,确定出区域生态安全的判断依据。将模型用于陕西省西安市进行实际应用,结果表明:目前西安市的生态安全状况并不理想,自然环境子系统所产生的环境问题制约着社会经济子系统的发展。这一测度结果与西安市的实际情况相符合,该模型在测度区域生态安全具体状况方面具有实践价值。

The regional ecological security is closely related to the sustainable development of the region. In this paper, the principle of Lotka-Volterra symbiosis theory is applied to construct the social economy and natural L-V symbiosis model. We use DPSIR model to calculate the basic index and the synergy coefficient.In order to avoid human interference, we usecluster analysis method, variation coefficient method and entropy weight method to establish index system and assign weights to quantify the whole process of the measurement. At the same time, the dynamic analysis of stable equilibrium point and synergistic coefficient of the model is carried out to determine the basis for judging the ecological security of the region. The above model is used to measure the ecological security of Xi＇an. The results demonstrate that the ecological security of Xi＇anat present is not ideal,and the environmental problems produced by the natural environment subsystem restrict the development of the social and economic subsystems.The measurement is consistent with the reality of Xi＇an, and the model has practical value in measuring the specific situation of ecological security in region.