城市大面积地面铺装,阻断了降水渗入土壤的途径,也阻断了土壤中气体与空气交换的途径,不但使行道树的根系,缺水缺氧而生育不良,而且大大增加了灌溉用水的消耗,为改变上述状况,三年来北京市园林科学研究所和北京 Urban large area of ​​the ground pavement, blocking the infiltration of rainfall into the soil, but also blocked the way the soil gas and air exchange, not only to make the tree roots, lack of water and lack of oxygen and poor fertility, but also greatly increased the irrigation water Consumption, in order to change the above situation, three years Beijing Institute of Landscape Architecture and Beijing