Abstract:

Solanum davidii,Bauhinia brachycarpa and Osteomeles schwerinae are shrub species adapted to karst mountainous area.Taking rotten coffee shell,rotten bagasse,peat and forest soil as components,four kinds of growing substrates were prepared and conducted in the seedling raising experiments on these three species.Seven parameters of tested seedlings including height,basal diameter,length of main root,width of root system,number of primary lateral roots,aboveground biomass and underground biomass were monitored and examined to analyze the effects of different growing substrates.It was found the effects of different substrates varied,and each species had its preferable growing substrate.The performance of seedling growing was the comprehensive results of plant species characteristics,seedling growing regular,physical and chemical aspects of growing substrate.Based on growing performance,and the calculation results of membership function of seven parameters,it was concluded that the growing substrate coded No.1 with rotten coffee shell as the main component was suitable for Solanum davidii,Bauhinia brachycarpa,the substrate coded No.2 with the rotten bagasse as the main component was suitable for Osteomeles schwerinae,and No.2 and No.3 (peat) were suitable for seedling raising of Solanum davidii.

Key words: karst mountainous area, suitable shrub species, seedling growing substrate, Solanum davidii, Bauhinia brachycarpa, Osteomeles schwerinae