关键词: 城市绿地, 生态服务功能, 空间格局, 西安市

Abstract: Urban green land is the critical composition of urban natural ecosystem，which provides various ecosystem services for urban residents，and has great value on ecosystem services. It is of great significance to explore urban green ecosystem services and its spatial pattern，not only for revealing the coordinate relationship between ecosystem services and economic，social function in city，but also for building livable urban environment. Currently，researches on ecosystem services of urban green space is mainly aimed at qualitative analysis, but quantitative and effective research is few，with reference to the previous researches and in accordance with the local situation of Xi’an City，the paper has developed a set of ecosystem services value on per area of green landscape．Based on data of SPOT image and land use map， employing landscape ecology methods，ArcGIS and Fragstats softwares，the ecosystem services of urban green land were evaluated and its spatial patterns were also analyzed in this paper. These conclusions were reached as follows：（1）The total area of green land is about 3 881.45 hm2 in built-up area of Xi’an City. All types of green land are significant differences in area and their distribution is quite unreasonable. The separation index of landscape is high and its contagion index is low；（2）The total value of ecosystem services provided by urban green land is around 75.47 million Yuan，in which the highest value comes from public green land against to the lowest from orchard. In general，the value of recreational service is the highest and food production is the lowest；（3）The ecosystem service’s pattern is profoundly affected by landscape spatial pattern，the spatial patterns of ecological services are as follows：there is high value in areas between First Ring Road and Second Ring Road and low value in areas inside the First Ring Road and outside the Second Ring Road；the value of food production is gradually decreasing from edge of built-up area to urban core；and value of recreation experience varies from higher area of inner city to lower area of outside city. The total value of ecosystem services decreases gradually from areas of urban core, industrial or business district and old urban district where the more ecosystem services are in demand to areas of urban edges, even suburban. It suggests that the distribution of ecosystem services provided by urban green land presumably is inverse to the pattern of population，economic and building density. The result also shows that it is available for applying landscape ecology’s method to analyze the spatial pattern of ecosystem services．

Key words: urban green land, ecosytem services, spatial pattern, Xi’an City