SUPERIOR STRATEGIES AND ANALYSIS ON INTEGRITY OF URBAN ECO-NETWORK CONSTRUCTION IN THE REGIONS AROUND LAKE——TAKE CHANGDE CITY OF WEST DONGTING LAKE REGION AS AN EXAMPLE
以常德市为例，利用GIS和网络分析法评估环湖地区城市生态网络的连接性、通达性和顺畅性，发现森林、农田、城镇生态系统的连接性差，湿地稍好，并据此提出优化策略。
The urban eco-network is the network structure in the urban eco-system that the flowing of the substance,the population and the information have been formed in the spatial distribution.The urban eco-network in the regions around lake is made up of the eco-system of forest,farmland,town and wetland,whether respective or mutual,their characters of connection and smooth directly influence the integrity of urban eco-network.Using GIS,MapInfo Professional6.5 and the network analytical method,taking Chang de city of West Dong ting Lake as an example,the paper analyses the integrity of urban eco-network.The results show that① The characters of connection in the eco-system of forest,farmland and town are very poor between spots,the indexes of alpha,beta and gamma are very low,and the index of alpha appears negative;By comparison,the character of connection of the wetland is a little better,but its index is also low;With regards to the region,its character of connection is much better.② The characters of entrance in the eco-function districts is much better,transformational network is relative convenient,especially in the eco-agriculture district.③ As to the characters of smooth in the eco-system of forest,wetland and farmland,5 eco-function districts are the best,and 3 eco-function districts are the worst in the 17 eco-function districts.Based on the above analysis,the superior strategies on integrity of urban eco-network construction are put forward.