Cultivation of Young stock Plants and Selection of Cuttings in Chinese Fir Scion-plucking Garden

In the first year after one-year-old superior seedlings were planted in Chinese fir cutting collecting garden,a trial involved in 12 treatments(5 ways×2 or 3 seasons)to stimulate sprouts at the bottom of the stocks was established. The numbers of both total sprouts and available cuttings per tree in the spring of the following year varied significantly among the treatments. MSA(make stem with an angle of 20～30°against ground)CST(cut off stem top)CMS(cover up middle of stem with earth)CHS(cut off half stem)CSG(cut off stem at ground level). MSA and CST were carried out separately in August and in April,and the best results obtained.The worst were found in CSG in both April and August,but the CSG in December was better than the former's both. Though it is really important to maintain enough canopy but to timely limit its terminal growth in the young stock's management.The numbers of available cuttings per ha of both the MSA with spacing of 0.5 m×0.8m,and the CSG with 0.5m×0.5 m were observed for three years. The result showed that the cutting yield of MSA was 40%～50% higher than that of the CSG. Howerver,thining of stock plants should be done in the fourth year after planting for the MSA garden. But the CSG was suitable for dense planting,where the higher numbers of cutting could be obtained in early stage. Some experiment indicated that position and size of cutting materials showed significant influence on height growth,uniformity,and survival of rooted cuttings. It is suggested that stout cuttings of 10 cm long,with a well developed terminal bud should be collected from the lower part of a stem,20 cm above ground.