碎砖和陶粒配制的拓展型屋顶绿化基材栽种景天植物对比试验

目的]对比建筑垃圾和陶粒配制的拓展型屋顶绿化基材栽种景天植物的效果,为相关的研究提供参考。方法]采用酒糟(5%)、表土(10%)、河沙(25%)、复合肥(4kg/m3)以及60%陶粒或55%碎砖、5%碎石灰石配制的2种屋顶绿化基材,现场栽种2种流行的景天植物垂盆草(Sedum Sarmentosum)和佛甲草(Sedum Linare);在18个月内考察植物盖度、植物干重、基材养分含量的变化。结果]建筑垃圾基材栽种的植物的盖度和干重大于或等于陶粒基材;建筑垃圾基材的磷、钾养分含量减少与陶粒基材无显著差异,氮养分含量减少量小于陶粒基材;佛甲草的盖度和干重显著高于垂盆草。结论]建筑垃圾配制的拓展型屋顶绿化基材能取得比陶粒配制的基材更好的绿化效果,可以取代陶粒用于配制屋顶绿化基材。

Comparative Study on Planting Sedum Plants in Extensive Green Roof Substrates Made of Crushed Brick and Ceramsite

Objective] The objective of the study is to compare the effects of planting sedum plants in green roof substrates made of crushed brick and ceramsite in order to provide the reference for related research.Methods] With two types of extensive green roof substrate mixed by using 5% distillers'' grains, 10% top soil, 25% sand, compound fertilizer(4 kg/m³) and 60% ceramsite, or 55% crushed brick and 5% lime stone, we planted two popular Sedum species(Sedum sarmentosum, SS; Sedum Linare, SL) in them, and then investigated coverage and dry weights of plants, and nutrient content(total nitrogen, TN; total phosphorus, TP; and total kalium, TK) in substrate within 18 months.Results] Plant coverage and dry weights from substrate made of crushed brick were greater or equal to those from substrate made of ceramsite, while the decreases of TP and TK in two substrates did not differ from each other significantly, TN in substrate made of crushed brick reduced less than substrate made of ceramsite. The coverage and dry weights of SS were significantly higher than those of SL.Conclusion] Green roof plants grow better in the green roof substrate made of crushed brick than substrate made of ceramsite, and thus can replace ceramsite in mixing green roof substrate.