Ecological security is one of the foundations of national security,and is the basis of regional sustainable development.Regional ecological security includes ecological-environmental security,economic security and social security.On the basis of the development of the eco-economic system of Zhifanggou Valley in the Loess Hilly Region over 70 years,based on historical research and related literature,and with the Pressure-State-Response(PSR) model framework as a foundation,a 3-layer conceptual assessment inde...
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