Abstract: Plant diversity is an important research content of biodiversity. With the development of landscape ecology and GIS, the theories of landscape ecology, meta-population, and island biogeography were applied jointly in the protection and utilization of plant diversity in past 20 years. Based on these theories, this paper discussed the effects of landscape composition (patch, corridor, and matrix), its structure (patch area, edge, and isolation), and its patterns along environmental gradient (altitude, succession, soil nutrients, and disturbance) on plant diversity, with the focus on the significance of GIS application and the necessity of plant diversity research in landscape scale. To study the combined effects of multi-factors on plant diversity in multi-scale could be helpful to the research of plant diversity change and its related mechanisms, and to the protection and utilization of plant diversity.

Key words: Short photoperiod-low temperature induced male sterile rice, Photoperiod, Temperature, Fertility alteration