High bed
Bed bed above the ground bed called high bed, after the land preparation to take the trail soil found in the bed, the bed is generally higher than the ground, the bed can improve soil ventilation, improve soil temperature, increase the thickness of the soil layer, and easy side Side irrigation and drainage, suitable for rainy areas, cat heavy soil water or poor conditions of poor conditions in poor areas and require well-drained tree species such as Pinus tabulaeformis, white pine, magnolia and so on.
Low bed
Bed is not higher than the ground, leaving the bed stem above the ground, low bed for irrigation, suitable for lack of temperature and dry early nursery. For hi wet, the small seed seed tree species such as Platanus, Pacific flowers, metasequoia and so on.