关键词: 白粉病, 白粉病, 尧麦16, 衍生品系, 产量

Abstract: This paper describes an experiment investigating the influence of plants diversity on green roof and the effect of substrate depths on plants survival, in order to select the vegetation types which can adapt to the climate of Beijing. The experiment was conducted under the real rooftop environment, the performances of 3 Crassulaceae combinations were tested on substrates of three different depths (7, 10, 15 cm). Plant survival, coverage, substrate moisture content, visual appearance and growth vigor were measured. It was concluded that deeper substrate promoted higher survival and coverage, better appearance and growth vigor, as well as higher substrate moisture content. By comparing the plant combinations and considering the performance of all indexes and plant diversity, it was found that No.2 (Sedum reflexum, Phedinum spurium‘Coccineum’, P. spurium‘Splendens’) > CK (S. lineare) > No.1 (S. sexangulare, S. acre, S. album‘Coral Carpet’). 15 cm substrate could provide a better growth environment for plants on the extensive green roofs, and No.2 was the best combination which could be widely applied in Beijing.