中文摘要：

城市里大量的建筑，不透水铺地与沥青路面取代原有地表，致使城市地基中普遍含水量不足、土壤内部生态失去平衡。热岛效应等均为近来关注的焦点，该文详尽对美国波特兰雨水花园进行评介，提出雨水花园是创建城市生态的一种有效途径。

英文摘要：

The high-density construction in the urban areas makes the soil surface almost impermeable, which leads to an ecological unbalance in the soil, the heat island effect etc, This article introduces and comments the rainwater garden in detail to put forwards that the rainwater garden is an effective way to establish the city ecological system.