Abstract: ：In order to find out the relationship between seedling height, ground diameter, fresh weight aboveground, fresh weight underground, dry weight aboveground, dry weight underground, root-crown ratio, root-to-crown ratio, height-diameter ratio, moisture content, total biomass, seedling mass index, root length, root surface area, root volume,using correlation analysis, stepwise regression linear analysis, curve analysis,the optimal fitting equation of quadratic curve between seedling height and aboveground dry weight was Y=11.740+2.231X+1.880X², the optimal fitting equation of quadratic curve of seedling ground diameter and total biomass Y=3.143+0.127X+0.002X² was established, the double linear optimal equation of total biomass and aboveground dry weight and underground dry weight Y=-0.002+1.001X₁+0.993X₂ was established, a linear optimal fitting equation of seedling mass index, optimal equation of mass index of seedling and binary linear fit of dry weight and moisture content of underground Y=0.131+0.026X₁-0.003X₂ was established, the ternary linear optimal fitting equation of seedling root length, root surface area, height and fresh weight aboveground was Y=-618.227+1.795X₁+62.056X₂-165.366X₃. The best fitting equation can be used to predict and guide the seedling cultivation and afforestation effect of small shell pecan stock container.

Key words: Carya illinoinensis, rootstock, container seedlings, traits