轻型屋顶绿化中景天属植物栽培基质配比研究

以国产泥炭、椰糠、珍珠岩、陶粒等为原料，进行不同配比的轻型屋顶绿化栽培基质配方研究，依据其理化性质，筛选出2种较适配方。以金叶佛甲草Sedum lineare ‘Aurea’等5种景天属植物为试材，对2种配比基质中扦插植株的生长效果进行比较，以筛选适于景天属植物屋顶绿化栽培基质。结果表明，除松塔景天S. nicaeense在2种栽培基质上生长差异不显著外，其余4种景天属植物均在配比为国产泥炭∶椰糠∶珍珠岩= 2∶3∶1的基质(F3)中生长旺盛，覆盖迅速，地上及地下部分生物量积累较大。因此，初步确定基质F3为适宜景天属植物生长的轻型屋顶绿化基质。

Substrate Formulation Screening for Sedum Plants Applied to Lightweight Roof Greening

Using domestic peat, coir dust, perlite, ceramisite as the component materials in the substrate formulation, the physico-chemical characteristics of the different substrate formulations were measured. Two substrate formulations were suitable for lightweight roof greening according to their physical and chemical characteristics. The effects of two substrate formulations on the growth of experimental Sedum plants were studied. The results showed that S. nicaeense was not significantly different in two substrate formulations. Other four Sedum plants grew strongly in the F3 substrate formulation, and biomass was significantly accumulated. The substrate formulation F3 that the ratio was domestic peat (2 portions), coir dust (3 portions) and perlite (1 portion) was fit for Sedum plants in lightweight roof greening.