关键词: 绿色空间, 生态服务功能, 理想林地当量, 相对评估, 北京市域

Abstract: The authors bring forward the concept of ideal forest equivalent, and takes it as the reference to measure green space service value. Base on GIS, the authors conduct relative assessment of green space ecosystem service in Beijing region (excluding central urban district) by inputting a series of data, such as remote sensing information, DEM, land use map, statistics and climate data. The assessment results are as follows: 1) The eco-service function amounts of Beijing green space is 555234 ideal forest equivalents, which correspond to cover 36. 38% of ideal forest in area; 2) Among the green space types, forest has the largest proportion of service functions, which is followed by wetland, garden and farmland; but the order of unit green space service functions are (from maj or to minor) : wetland, forest, garden, grass land, farmland and barren land; 3) Among the service functions, modulation is more than supply and culture service; 4) In view of the function distribution, from the urban function extended district, via the new districts of urban development, to the ecological preservation districts, the comprehensive evaluation value are gradually increased; 5) Compared to the ideal state, there are still more potential to improve and rise green space service functions in Beijing region. Finally, this paper put forward relevant countermeasures for ecosystem construction.

Key words: green space, ecosystem service, ideal forest equivalent, relative assessment, Beijing region