Abstract:

As an important research aspect in tourism geography,research on the spatial structure of tourism may contribute to reveal the laws of regional differentiation of tourism system and to provide the theory basis for optimization of tourism space system. This paper focuses on analyzing 2A and above tourism spots of thirteen prefecturelevel cities in Jiangsu province.To study the spatial structure aggregation fractal of tourism attractions and reflect the objective laws of tourism attractions distribution,the writer measures each aggregation fractal dimension on spatial structure of each tourism attractions system, based on the data of tourism attractions of thirteen prefecturelevel cities in 2001 and 2010.The results are shown as follows.（1）The developmental model of scenic spots of southern areas in Jiangsu transforms from point to planar.In the south,middle and north of Jiangsu province,the tourist attractions which aggregate in the main urban zone present different rules. The rule changing from northern areas to southern areas is from pitting development model to planar development model.(2)By analyzing 13 representative prefecturelevel cities on spatial scales,it reveals that the tourism spots of each city have the characteristic of aggregation and fractal which exists three different types.In the same type of tourist attraction systems,there are differences among the changes of the values of aggregation fractal dimension in different interval.(3)It also shows,in terms of the spatial structure of tourism attraction systems’,that the density is decaying from centre tourism attractions to the surrounding hinterland.  
The reasons for this phenomena can be ascribed to three factors as follows.Firstly,the difference of tourism resources spatial distribution in the south,middle and north of Jiangsu province is a vital reason.Southern city travel circles play a greater central role,and the travel areas have abundant tourism resources.The number of 4A level and 5A level tourist attractions in southern Jiangsu is 69,with a total share of 654% of Jiangsu province.And also the high dimension aggregation structure shows that the spatial structure of southern tourist spots is very strongly aggregated in the first scalefree interval. By contrast, there are less tourist spots in northern Jiangsu.Although the spatial structure is aggregated in some extent,the density of tourist spots decays quickly from the centre point of tourism attractions to the surrounding hinterland.Secondly,regional difference in the levels of economic development is another important cause.Strong economic strength can promote the development of tourism. The higher level of economic development in southern Jiangsu provides the higher living standard for the residents there, which is of benefit to the prosperity of the travel market and to the better conditions of tourism infrastructures and facilities.The last but not the least,the geographical environment and the traffic condition influence the distribution of tourism resources.South Jiangsu is located in the Yangtze River delta region,which has more intensive transportation network and important ports.〖HJ1〗