PROBLEMS OF URBAN AREA STRUCTURE AND THEIR OPTIMIZATION IN KARST MOUNTAIN REGION ——Taking Guiyang City for an Example

Guiyang city is located in karst region,the problems of urban area structure is very outstanding,which can be showed as following:①The land in urbanized district suiting to urban construction is one shortage,which accounts for only 0 64% of the total area;②The density of population and industrial factories is so high that there are 28 700 persons and more than 15 industrial enterprises per square kilometer in inner city;③Urban land use structure is out of balance,for example,the proportion of industrial area is too large(it accounts for 19 2% of the total Guiyang city area),and that of transportation and afforesting——fallow lands are on the low side,which prevents Guiyang city from development of“the third estate”;④Urban functional districts are mixed,and urban environmential problems are much more grave. Based on analysis of these problems,the paper especially explored the factors that causes the problems of urban area structure in Guiyang city,and corresponding optimization countermeasures are suggested finally.