论文部分内容阅读
应用梯度分析与景观指数相结合的方法,分析了2004年北京城市绿地系统沿东西和南北两条城市扩展轴分布的空间格局。结果表明:城市绿地整体上破碎化程度高,连通性好,边缘效应较强;从城市中心到边缘,绿化覆盖率不随距城市中心远近而变化,小型斑块数量比例、斑块数量、形状指数、破碎度、平均最近邻体距离等指标则表现出明显的梯度变化;影响绿化覆盖率和斑块面积频率分布的主要因素是公园性质大型斑块的分布状况。研究结果说明:在目前城市绿化覆盖率较难提高的情况下,通过应用梯度分析与景观指数相结合的方法对现有绿地空间结构进行分析调整,不仅能优化城市绿地的景观格局,还能更好地发挥出城市绿地缓解环境问题的功能。
Using the method of gradient analysis and landscape index, the paper analyzes the spatial distribution of the expansion axis distribution of Beijing urban green space system along the east, west and north and south in 2004. The results show that the urban greenland has a high degree of fragmentation, good connectivity and strong edge effects. From the center of the city to the edge, the greening coverage does not vary with the distance from the city center. The proportion of small patches, the number of patches, the shape index , The degree of fragmentation and the average nearest neighbor distance showed obvious gradient changes. The main factor affecting the frequency distribution of green coverage and plaque area was the distribution of large plaques in the park. The results show that the current green coverage in urban areas is hard to be improved, and the spatial structure of existing green spaces can be analyzed and adjusted by applying the method of gradient analysis and landscape index, which can not only optimize the landscape pattern of urban green space, Good play to urban green space to alleviate environmental problems.