Abstract:

To study the influencing factors of the survival rate of Camellia chekiangoleosa crown grafting and solve the problem of low graft survival rate, in June 2013, the Institute of Subtropical Forestry, Chinese Academy of Forestry introduced C. chekiangoleosa champion tree spike, carried out the crown grafting test of C. chekiangoleosa in Dayangshan Forest Farm in Qingtian County, and analyzed the influence of canopy density, slope position, rootstock growth potential and scion storage time on graft survival rate. The results showed that the forest canopy sealing degree was between 0.3 and 0.7, and the average survival rate of grafting increased as the canopy sealing degree increased. The canopy closure degree was between 0.7 and 0.9, and the graft survival rate decreased with the increase of canopy closure degree. When the canopy sealing degree was 0.7, the grafting survival rate was 88.8%. The survival rate of grafting on the mountainside was as high as 86%, which was much higher than the survival rate on the top and foot of the mountain. The stronger the growth potential of C. chekiangoleosa rootstock, the higher the graft survival rate was. The grafting effect of the scion on the day of the scion was the best, with a survival rate of 89.1%. The scion was stored for 1, 2, 3, 4, 5, and 6 days for grafting, the survival rate was 85.2%, 75.2%, 51.6%, 28.1%, 12.2% and 9.3% respectively. Partial correlation analysis showed that the effects of various factors on the graft survival rate were scion storage time (-0.97), canopy closure (0.85), growth potential (0.81) and slope position (-0.65).

Key words: Camellia chekiangoleosa, crown grafting, canopy density, survival rate, influencing factors