<正>对象关系型数据库管理系统Oracle9i提供了一种全新的SQL（Spatial Query Language）、空间数据模型、空间关系规范化及空间操作集。笔者从GIS发展现状出发，阐述了Oracle9i为GIS实现空间数据与属性数据的高效率、集约化、共享性存储提供了基础，群集技术为实现长事务快速相应提供了条件，数据仓库和数据挖掘技术为实现地理对象空间分布变化范围的空间维分析和时间变量变化范围的时间维研究提供了依据。

On the basis of investigating on data of the street trees in urban area of Zunyi city, the distribution patterns and species diversity of the street trees in Zunyi city were analyzed. The results were as follows: (1) There were 23 tree species along the streets, and the number of six kinds of street trees amount to 85.54%, the total biodiversity index was 0. 924; (2)The average diameter was low, the trees with the diameter lower than 10 cm were 47%; (3)The total biomass of street tree was 1 500 t, which was equal to about 18.9 hm2 forest, and the total leaf area was about 1 018.67×103 m2.