Spatial-temporal Assessments And Evolution Research Ot Coastal Eco-security Based On GIS

In this study, taking the Landsat TM remote sensing images (track No.120/32,120/33)of Wafangdian County-level City in2000,2005and2010as the data sources, the coastalecological security evaluation system was established on the basis of landscape patternanalysis and pressure-state-response (P-S-R) framework. Grid database of coastal eco-securityassessment was created by quantitative multi-source data with GIS grid technology.Eco-security status was estimated by the use of the weighted-fuzzy membership degreemethod. Temporal and spatial evolution of eco-security pattern was analyzed through spatialstatistical methods in order to reveal evolution features of coastal region ecological safety aswell. The results showed as follows:①The ecological safety index of WafangdianCounty-level City from2000to2010was0.4636,0.3878and0.4636, respectively, whichdemonstrated eco-security situation had a slight improvement after deterioration, but weshould pay more attention to prefect the ecological status in western coastal district.②Moran’s I from2000to2010was0.9015,0.8738and0.8703, respectively, which indicatedthere was a significant correlation of spatial evolution in the space. The characteristic ofecological safety pattern was that areas with high value was inclined to be close to the regionsof better ecological eco-security status, while the low degree of eco-security status presentedadverse tendency, which performed extremely obvious from2000to2005.③The nuggets ofeco-security index in Wafangdian County-level City was0.003,0.0007and0.00093,respectively, which showed the non-structural factors played an ever-increasing role in spatialdistribution of ecological safety in the study area, which was consistent with the actualconditions of urban construction land expansion and frequent human activities in the pastdecade. The change about value of CO/(CO+C) decreased as the speed increased initiallyand decreased afterwards, which reflected the impact of non-structural factors on the spacedifferentiation of ecological security had experienced a consistent change trend. With theimplementation of the land policy and management of Dalian City, the influence fromnon-structural factors such as urban construction and human activities on eco-securityevolution has been cut down since2005.