Study on Gravity Center Movement and Spatial-Temporal Differences of Port Industry and Economic Growth in China's Coastal Areas between 1994 and 2014
Taking five port groups in China as the research objects, a comprehensive system of evaluation indicators for port industry and economic growth in coastal areas was established from global to local, the spatial-temporal differences and characteristics between the port industry and economic growth in coastal areas from 1994 to 2014 were analyzed by Gravity center movement model and Exploratory spatial data model. The results indicated the gravity centers were mainly concentrated in south and moved towards Yangtze river delta gradually. On the global aspect, the port industry had a spatial-temporal difference from significant positive to significant negative correlation; the economic growth in coastal areas illustrated a spatial positive correlation and the three stages of "positive-negative-positive" in time and spatial dimension were demonstrated in the port industry-economic growth. On the local aspect, the regions with H-H type in port industry moved from Pearl river delta to Yangtze river delta regions and the regions with L-L type were concentrated in southwest and western Bohai regions; the regions with H-H type in coastal economic growth focused on Pearl river delta, Yangtze river delta and southern Bohai regions with less change and the regions with L-L type were centered on Hebei, Guangxi and Hainan; the regions with L-L type in port industry-economic growth took Pearl river delta and Yangtze river delta as the centers expanding to surrounding areas. Hebei and southwestern coastal areas were concentrated in the regions with L-L type and the range of which was shrinking gradually.