覆盖物对屋顶绿化基质水分变化和植物生长的影响

The coverings influences on substrate moisture holding and plant growth of the roof greening

为研究不同覆盖物对屋顶绿化基质水分变化和植物生长的影响，采取陶粒（处理A）、落叶（处理B）和落叶＋地膜（处理C）3种方式对盆栽白蜡进行覆盖，以未覆盖盆栽白蜡为对照（CK），进行基质水分变化测定和植物生长调查。结果表明：采取覆盖措施的处理基质含水量增加7．68％～10．63％，处理A对基质保水“缓释”水分作用最大，处理B和处理C作用次之；采取覆盖措施有效促进了苗高、地径、冠幅的生长，处理C对促进植物生长作用最明显，其苗高、地径和冠幅比对照分别增加了20．45％、5．69％、84．71％。

In order to study the coverings influences on substrate moisture holding and plant growth of the roof greening, the substrate moisture and plant growth of the potted plant Fraxinus chinensis covered with ceramsite （ treatment A）, fallen leaves （treatment B） , fallen leaves and mulching film （treatment C） ,were determined. The resuhs showed that, the water content of substrate covered with coverings increased by 7.68% -10.63%, the water retention of A treatment was optimum, the B and C treatment were worse Covering measurements effectively promoted the seedling height, ground diameter and crown breadth growth, treatment C exhibited the most promotion on the plant growth, seedling height increased by 20.45 % than CK, ground diameter increased 5.69% than CK, the crown increased by 84.71% than CK.