绿化屋顶轻量基质持水特性研究

Study on the Water-holding Characteristics of Light Matrix for Green Roof

绿化屋顶具有减缓雨洪、调节局部气候、净化环境等功能,在国内外各大城市得到广泛应用。轻量基质是绿化屋顶普遍采用的代替天然土壤的种植层基质,是屋顶水分涵养、植物生长的主要载体。有关轻量基质的持水性能研究目前尚不多见。结合在北京市某大学办公楼楼顶平台所建的绿化屋顶示范区,对种植层轻量基质的持水特性进行了相关试验,得出了表征其持水性能的相关参数,并用示范区气象和水分自动观测数据对试验测得的基质持水特性进行了验证,结果表明:绿化屋顶所用的轻量基质容重远低于普通土壤,而持水效果很好。该文研究成果可为绿化屋顶的水热规律分析及推广应用提供理论参考。

Green roofs have been widely used in major cities all over the world for their function of reducing flood,regulating local climate and cleaning up environment.Instead of natural soil,light matrix is usually used as planting layer on green roofs.At present,there is little study on water-holding characteristics of such material.In this paper,combined with a plot of green roof build up on the top floor of an office building in a university in Beijing,some experiments on the water-holding characteristics of matrix were carried out.Some other characteristics of water content were also tested and verified by the experiments and data on green roof were automatically observed.According to the experimental results,it was obtained that the material used in the green roof is much slighter than natural soil,but with great water-holding capacity.The research results can provide basic references for deeply analyzing water and heat energy,as well as application and promotion of green roofs.