城市绿地景观格局研究--以徐州市为例

运用遥感和地理信息系统技术,以徐州市为例,选用美国的"快鸟"(Quick Bird-2)卫星图像为主要信息源,建立徐州市城市绿地信息系统。在此基础上,以景观生态学理论为指导,选取了绿地景观构成、景观多样性指数、景观优势度指数、景观均匀度指数、斑块密度、斑块数破碎化指数、最小距离指数、景观连通度等景观生态指标对城市绿地景观的结构和格局进行了分析。结果表明,徐州市建成区城市绿地存在着景观结构不合理、破碎度高、景观类型分布不平衡、斑块连通度较低等问题,针对这些问题,提出了徐州市绿地景观建设对策。

ANALYSIS ON THE STRUCTURE AND PATTERN OF URBAN GREEN LAND--A Case Study of Xuzhou City

As the dominant natural component and primary producer,the urban green land has an important role on improving environmental quality,regulating the balance of urban ecosystem and maintaining ecological security.However,the ecological functions of the urban green land has a closed relation with its landscape structure and pattern when the percentage of green land coverage is less than 40%,so the study on the landscape structure and pattern of the urban green land is very important in building the scientific urban greens system and play its ecological role fully. The paper analyzes the urban greening landscape structure and pattern in Xuzhou city using the structure of green space,the landscape diversity,the landscape dominance,the landscape evenness,the patch density,the landscape fragmentation,the nearest neighbor index and the landscape cohesion.The object is to provide the foundation to build the scientific urban greens system and play its ecological role fully in Xuzhou city.At the same time,the study can provide comprehensive method to research the urban greens landscape structure and Pattern.The result shows that,the distribution of the urban Green land is disproportional,there are more green land in the southern of the city but in the northern,the green land is less,the structure of the urban green land isn't reasonable,the scenic forest and the public park are the dominant greens types,the green land is dominated by small patches and the landscape fragmentation is higher which is not favorable for providing more habitats to support the species diversity,the green corridor density and the landscape cohesion is smaller which is not benefit to flow among the species. At last,the corresponding strategies were put forward such as building more public parks,green buffers and the unit attached green spaces especially in the northern of the city,increasing the proportion of the large patches and decreasing the landscape fragmentation,building more green corridors along the rivers and roads to increase the green corridor density and landscape cohesion which have important role on preserving species diversity and keeping the landscape diversity.