THE COMPARATIVE STUDY ON CONNECTIVITY AND 500 MRSR OF UPGS IN SOUTHERN PROVINCIAL CAPITAL CITIES OF CHINA Wang Tai-Chun1,2, Wang Fang2, Qu Yan-Hua2, Duan Sen-Yu2 1Institute of City-Rural Planning and Design, Gansu Province Academy of City Development Lanzhou, China, 730070 2School of Art, Lanzhou City University Lanzhou, China, 730070 The urban public green system (UPGS) is an important component of the urban ecological system. <...> We investigated eight provincial capital cities in southern China to analyze the connectivity and 500 m radius service ratio (500 MRSR) of the public green system based on GIS information from 2010. <...> The results also showed that the increase in the amount of patches density, the landscape connectivity and 500 MRSR were accompanied by a progressive decrease in the city scale. <...> Overall, the results suggest that the landscape connectivity and 500 MRSR reflected the ecological structure and the level of function of the public green system, also reflected the degree of coupling between the social services and urban construction in the public green landscape system. <...> This study determined the current state of urban public green spaces from the perspectives of the ecological system and the social services, which are important for facilitating the coordinated development of the urban public green space system. <...> The city public green space (PGS) system refers to city parks, squares and pocket parks etc. have the functions of ecological and social service, but also are important outdoor active places for citizen. <...> So, the PGS patch pattern and changes will influence on ecological safety and living quality of citizen [23]. <...> Meantime, harmonizing the relationship between natural ecosystem and its service, stress, respond and construction of human well-being have become a core topic ecological study in all over the world [40]. <...> With the increasing urbanization, more and more people concentrate upon the large city. <...> The system of PGS as an important part of urban ecosystems, play a key role in preserving biodiversity in urban areas. <...> Moreover, green spaces sequester CO2 [31; 32; 27] 29 Вестник РУДН, серия Экология и безопасность жизнедеятельности, 2014, № 3 and produce O2 [15], reduce air pollution [48]; and noise [8] and regulate microclimates, reduce <...>