Evaluation of tourism ecological security and its obstacles in semi-arid river valley urban: a case study of Lanzhou, China.

6 , the obstacle degrees of the pressure, state, and impact subsystems in Lanzhou’s tourism ecological security system exhibit an increasing trend, while the obstacle degree of the driver subsystem shows a decreasing trend, and the obstacle degree of the response subsystem fluctuates.

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Overall, there is an increasing trend in the coupling coordination among the subsystems.

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