Connectivity Of Ecological Land Use And Construction Of Ecological Security Pattern In Eastern Coastal Areas Of China

Coastal areas,as the most dynamic areas in China’s economic development,are facing the problems of reduced landscape connectivity and degradation of ecosystem functions.It is urgent to build a regional ecological security pattern to ensure the sustainable development of coastal land space.Based on China’s coastline as a benchmark,a 100km buffer zone toward the mainland is made as the research area,using Arc GIS 10.3,Conefor 2.6,Guidos Toolbox and other software were used to analyze the temporal and spatial dynamic change characteristics of ecological land in the study area from 1980 s to 2018.Combined with the characteristics of the study area,the importance level of ecological protection in the study area was evaluated from three aspects of ecosystem service importance,ecological sensitivity and landscape connectivity,and the ecological source of the study area was identified.At the same time,natural factors and human factors were comprehensively considered Based on the minimum cumulative resistance model,the ecological corridor and nodes in the study area are identified,and the ecological network of the study area is constructed to evaluate and optimize.Finally,the paper constructs the ecological security pattern of the study area,and puts forward policy suggestions for each type of regional use control.The results show that the ecological source area of the study area is 227469.22km~2,accounting for 45.72%of the total area of the study area,showing north-south heterogeneity in space;based on the MCR model,64 ecological corridors in the study area are extracted,with a total length of 17391.52 km and an average length of 271.74km,among which the central corridor is relatively dense,and the structure of the north and south ends is single.According to the calculation results of gravity model,28important corridors are determined Based on the construction of corridors,61ecological nodes in the study area were extracted.The calculation of ecological network index showed that the integrity of ecological network in the study area was low,the stability was poor,and the exchange between North and South system was insufficient.Therefore,three ecological sources were added in some areas of Liaoning,Hebei and Shandong provinces,and four ecological corridors were simulated The existing ecological network is optimized.According to the minimum comprehensive resistance surface,the areas except the ecological source area are divided into ecological buffer zone,ecological transition zone and development and construction zone,with an area of 187067.90 km~2,76986.87 km~2,188851.90 km~2 and 46312.62 km~2 respectively.Based on the extraction of ecological network elements and delineation of ecological management and control zoning,this paper constructs a coastal ecological security pattern of"one corridor,one belt,two zones and multiple points",which is composed of land ecological green belt,marine ecological water corridor,northern ecological agriculture area,southern ecological protection area and multiple urban agglomerations,so as to provide scientific basis for the high-quality development of land space in China’s coastal areas.