A screening of the substrates for Sedum lineare in tropic and humid environmental conditions

Sedum lineare is a popular choice among green roofing projects due to its extensive management, easy propagation and tolerance for heat and drought adaptability. However, the project practice shows that Sedum lineare cannot resist water logging, it even leads to root rot and death in tropic and humid environmental conditions. The test is adopted to screen the substrates of S.lineare for the green roofs with the import peat, domestic peat, green waste, perlite and palm fiber. Based on the growth index of S.lineare and the physicochemical property of the substrates, the test aims to screen which is the most suitable substrate for S.lineare. The result shows that the green waste is the best suitable substrate for S.lineare in tropic and humid conditions, and it is the cheapest one to save engineering cost. Furthermore, an orthogonal experiment is adopted to find green waste∶perlite∶Palm fiber is 8∶1∶3 and 8∶3∶2 and both have a remarkable effect on S.lineare growth.