Trends Analysis of Ecological Environment Security Based on DPSIR Model in the Coastal zone: A survey study in Tianjin, China

The “Driving force - Pressure - State - Impact – Response” modeling framework is adopted to consider the formation mechanisms of environmental risks and the requirements of ecological environment protection. Moreover, a systematical index system and evaluation model for the measurement of the coastal ecological security level is put forward in this paper to assess the state of coastal ecological environment security. The results show that the security level of the Tianjin coastal ecological environment exhibits an overall downward trend, with the coastal ecological environment security value (E) falling from 0.7491 in 2005 (in good condition) to 0.2773 in 2010 (in a poor state) , and the value will continue to decline into a bad state in the next decade. The increasing use of coastal areas, growing population and increasing emissions of pollutants into the sea are the primary phenomena leading to environmental degradation of coastal ecosystems, which further leads to the degeneration of the ecological and environmental conditions of the coastal zone in Tianjin. The 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. At present, the marine ecosystem conservation actions, including pollution control, monitoring and surveillance system and emergency management mechanism, are not enough to offset the impacts on the marine ecosystem caused by driving force and pressure changes. It is necessary to establish a coordinated integration management system for the land and sea and an ecological compensation mechanism.