屋顶绿化基质养分调控初探

Exploration of Substrate Nutrient Regulation Methods for Roof Greening

提高基质保肥性能和优化肥料使用方式以降低养分流失,是屋顶绿化的关键环节之一。通过淋溶模拟和盆栽试验探究有机、化学肥料对屋顶绿化基质氮、磷、钾养分淋失的影响,结果表明:有机肥和复合肥15-15-15或缓释肥14-14-14配合使用可以在增加基质养分含量的同时,保持较低的养分淋失量,为垂盆草Sedum sarmentosum生长提供长期稳定的肥源;其中配合使用有机肥和复合肥效果最好,垂盆草定植快,叶绿素含量和肉质化程度指标也较优。

Improvement of fertility maintaining and optimizing the use of fertilizer in cultivation substrate is considered as one of the key points in roof greening.Leaching experiment and pot experiment were performed to study the effects of organic fertilizer and chemical fertilizer on the releasing characteristics of N,P and K from roof greening substrate.The results showed that the combined use of organic fertilizers and compound fertilizers15-15-15or slow release fertilizers14-14-14can not only increase the nutrient content of the substrate,but also maintain the loss of soil nutrient at a relative low level to supply the Sedum sarmentosum with stable nutrients for a long time.Especially,adding organic fertilizer and compound fertilizers synchronously into roof greening substrate can promote the growth of Sedum sarmentosum and with higher vegetation rate,as well as the chlorophyll content and degree of succulence of its leaves.