北京城市中心区在竭力增加绿色。政府决心大，规划明朗，全民拥护。而大面积植树，特别是铺装草坪，对市民最珍惜的水增加了需求量，似又是一新的矛盾。可北京城干旱缺水，地上水、地下水全缺，常年降水量近几年一直在４００毫米上下，没有水，树木花草是难以存活的。植了树， Beijing downtown area is trying to increase the green. The government is determined, planning is clear, universal support. However, large-scale tree planting, especially paving the lawn, increases the demand for water which is most cherished by the public and seems to be a new contradiction. May be arid and dry in Beijing, groundwater, groundwater full, perennial precipitation in recent years has been 400 mm up and down, no water, trees and flowers is difficult to survive. Planting trees,