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研究了城市不同硬化地面类型（水泥地面、水泥砖面和踏实土地面）对悬铃木物质循环、水分循环及营养元素（Ｎ，Ｐ，Ｋ）循环的影响。结果表明：自然降水在城市水泥地面，水泥砖面或坚实的地表上很容易形成较大的地表径流，其中以水泥地面最甚，达４８％；各类型地面对雨水的渗透能力有明显差异，对照（花坛土）最强，为８７６％，踏实土（７２８％）次之，水泥砖面较差（３３％），水泥地面渗透量接近于零。城市土壤营养元素除Ｋ外，Ｎ，Ｐ含量以踏实土最高，分别为００７７７和００８６６，其次为水泥砖面（００６９９和００５８７）及水泥地面（００５６２和００６３１）；生产力排序为：踏实土＞水泥砖面＞水泥地面。树木对土壤养分的吸收量也呈现相似的趋势，表现为：吸收量越大，理论归还量越大，但由于实际归还量较小，则土壤亏损就较多。
The effects of different hardened ground types (cement ground, cement brick surface and solid ground) on the cycling of Cyclamen, water cycling and nutrient elements (N, P, K) cycle in urban were studied. The results show that natural precipitation is easy to form large surface runoff on urban concrete, cement brick or solid surface, of which the cement ground is the worst, up to 48%. There is significant difference in the infiltration capacity of rainwater between various types of ground , The control (turf soil) was the strongest, 87.6%, followed by 72.8% solid soil, cement brick surface is poor (33%), cement ground penetration is close to zero. In addition to K, the content of N and P in urban soils is the highest in practical soil, which are 00777 and 00866, followed by cement brick (00699 and 00587) and cement (00562 and 0 0631); productivity ranked as: solid soil> cement brick> cement ground. The uptake of soil nutrients by trees also showed a similar trend, as follows: the greater the absorption, the greater the theoretical return, but the greater the soil loss due to the smaller actual return.