Trends analysis of Ecological environment security based on DPSIR model in the coastal zone of Tianjin

• 1、College of Environmental Science and Engineering, Nankai University, Tianjin, 300071

Abstract： With taking full account of the formation mechanism of environment risks and the requirements of the ecological environment protection of the coastal ecological, through "Driving force - Pressure - State - Impact - Response model framework, this paper provided systematical index system and evaluation model for coastal ecological security level measurement, and assesses the state of coastal ecological environment security. First, this paper selected 26 indicators to reflect the driving force, pressure, state, impact and response to building evaluation index system; secondly, we collected the relevant statistics and research results to determine the values of the indicators, and standardized the data through range standardized formula. Finally, we established a comprehensive evaluation model coastal ecological environment security model and gray prediction model. The research results show that the security level of Tianjin coastal ecological environment show a overall downward trend, coastal ecological environment security value (E) has fallen from 0.7491 in 2005 (in good condition) to 0.2773 in 2010 (in a poor state). The increasing using intensity of coastal areas, the growing population and the growth of pollutants that emitted into the sea are objective reasons leading to environmental degradation of coastal ecosystems, which also led to the reduction of ecological and environmental conditions of the coastal zone in Tianjin, fell from 0.9494 in 2005 to 0.2027 in 2010. Inshore marine ecosystem is always in the sub-healthy and unhealthy state, which has affected the balance of the marine ecosystem, and led to poor biomes structure. Meanwhile, the number and density of creatures have shown a downward trend and the health level and marine biodiversity of inshore marine ecosystem have reduced. The scope of affected land and waters has been expanding. At present, the marine ecosystem conservation actions include pollution control, monitoring and surveillance system, emergency management mechanism are not enough to offset the impact of the driving force and pressure changes to the marine ecosystem. It's necessary to establish coordinated integration management system of land and sea and ecological compensation mechanism, carry out ecological damage compensation and coastal marine repairing engineering and promote industrial upgrading to enhance the security level of the coastal ecosystems.

Keywords： driving force-pressure-state-impact-response (DPSIR) ecological security assessment evaluation index system environmental management Tianjin