Study On Ecological Environmental Impact Assessment Of Road Network Based On The Theory Of Strategic Environmental Assessment

Road construction projects is the main cause of non-polluting ecological impact.It often possesses a lot of soil,concumes many resources and bring grievous impact to ecological environment. The road network construction has its inevitable influences on the ecological environment. On the Strategic Environmental Assessment level,Road network planning EIA can consider holistically the environmental effects from the distribution and construction of road network planning.Ecological Environmetal Impact Assessment is an important part of road network planning. Study on it can not only provide basic ecological principles and constraints for the road network planning,but also provide basis for planning EIA evaluation.The paper also put forward the the application of GIS on the effects prediction in ecology system,ecologically sensitive area,loss of water and soil,wart environment,geological disaster and mineral resources and gave the prediction medels of each evaluation elements.Under the support of the theories of sustainable development,landscape ecology,ecological footprint and ecology economics,the paper constructs a "four-level"appraisal system which includes environment suitability evaluation,environment sensitivity evaluation,ecological footprint anlalysis and environment eco-system threshold value evaluation,and then it established the index systems of the "four-level"appraisal system.Therefore it gave out the evaluation indexes in the areas of soil resources,ecologically sensitive area,loss of water and soil,water environment,geological disaster and mineral resources.Concept and characteristic of alterntive of road network planning are summaried, and modes,theories,principles,procedure and contents of alternative of road network planning are demonstrated.The paper concluded the current shortage in public participation, analyzed the process of ecological environment public participation.Besides,the theories and methods studied in this essay studied were applied to the Express Way Network Planning of Henan Province to test its feasibility.