Abstract: With 2a seedlings as test materials the height and growth rhythm of 22 kinds of spruce biennial seedlings were measureed.The results showed that the growth of 22 kinds of spruce trees is at a slow-fast-slow growth rhythm.By logistic curve equation fitting,the correlation coefficient of high growth process is more than 0.91,the equation of regression test is of significant water quality(P< 0.01),the process of growth of 22 kinds of spruce trees showed an obvious S type curve.The starting time and duration for high growth of the different kinds of spruce seedlings have significant difference,causing some difference in accumulated seedling growth.Finally,such 8 kinds of spruce as Picea smithiana Picea Norway spruce Picea mariana Picea Likiangensis Picea pungens Picea baifouriana Picea spinulosa and Picea asperata used for fast-growing species were chosen through clustering methodology.

Key words: spruce, seedling stage, logistic model, seedling height, growth rhythm