| Urbanization is one of the most important social and economic phenomena today. Along with it there are four processes, such as the economical development, the population growth, the spatial expansion and enhancement of life level, relate and accelerate mutually. The urban eco-environment problem receives people's attention increasingly in the series of processes day by day. It has already became the directions of city's development that to construct scientific and reasonable urban green space system and green space, to satisfy the needs of human settlements and survival, co-existence between city and nature, harmonious existence between humans and nature, and to buck for communal development the city and the environment."Three-dimensional vegetation quantity" was proposed as a new mentality and theory in the research of urban green space and its indices. It is a scientific method and instrumentality to weight the ecology function of urban green space and urban greening needing grosses in practice of urban planning and urban greening. Along with the superiority of GIS and RS was showed in urban research day and day, GIS and RS have showed their characteristics, such as efficient , scientific, precise, visual. They were already became important way and method in the research of urban green space.This thesis took 11 kinds of arbor and shrub, which are most widely distributing in Lanzhou, as objects of study.On the base of practical measurement, calculation and statistic analysis for data, this research studied mainly greening species's model of measure three-dimensional vegetation quantity based RS in the urban green space of semiarid characteristic region, obtained the correlative equation of "diameter-height" of crown for arbor and the equations to calculate three-dimensional vegetation quantity for tree's crown of Anning District of Lanzhou, and calculated the three-dimensional vegetation quantity of research area. At the same time this thesis used aerial remote sensing data of Anning District of Lanzhou as the data source and regarded ArcGIS 9 as platform to interpret, store, manage and analyze the information of urban green space, finally visual output by a series of maps.The results of study show: firstly, the residential area and the independent industrial and mineral land are the mainly landuse types where the three-dimensional vegetation quantity centralized distributed; secondly, the girds with medium three-dimensional vegetation quantity occupied the major part; thirdly, the structures of urban green space of of Anning District of Lanzhou were single in the whole; fourthly, S. japonica L., R. Pseudoacacia L. ,Cedrus deodara G. Don and Populus albaL.Var.pyramidalis are the major contributors to three-dimensional vegetation quantity. fifthly, the multi-structural urban green space had more three-dimensional vegetation quantity than the single structural urban green space.This research is contributory to melioration of the existing urban green space indices, at the same time filled the blank of research for three-dimensional vegetation quantity in semiarid characteristic region. It is positive significant to analyze the spatial distribution and the structure of Lanzhou's urban green space, to scientific and impersonal estimate its function. It provided quantitative scientific basis to plan Lanzhou's urban green space and improve the city ecological environment. This study is great significant for sustainable development of Lanzhou and improvement of resident quality of life.
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