Abstract:

Health evaluation on land use system and diagnosis of its obstacle indicators would be greatly helpful for sustainable land use.On the basis of defining the meaning of health on land use system,the evaluation index system was constructed based on the PSR model,then an empirical analysis was conducted in Sichuan province by entropy method and obstacle degree model.The results showed that the health degree of land use system had been gradually improved from 2000 to 2008,with the index increasing from 0394 5 to 0557 3.The degree of land use system generally experienced two stages,i.e.,unhealthy and critical state.The pressure index overally showed a downward trend,while status index and response index a rise trend.In the long run,the system pressure was found to be the major factor affecting health on land use system.The obstacle degree of system pressure and system status increased by an annual average of 881% and 097%,respectively,but the obstacle degree of system response decreasesd by an annual average of 766%.The growth rate for fixed asset investment,per capita arable land,land reclamation rate,extent of soil erosion and per capita GDP were verified to be the key obstacle for further improvement of health on land use system.The health on land use system was continuously improved by further transformation of economic development mode,strengthening supervision and management for land utilization,increasing the intensity of environmental governance,effectively controlling soil erosion,and so on