The high-density construction in the urban areas makes the soil surface almost impermeable, which leads to an ecological unbalance in the sot, the heat island effect etc.

• 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。