| 29 clones in the seeds with high yield, basic high yield and initial high yield of Korean Pine are selected according to the seed bearer of the mother trees and progeny test. These clones not only have high yield in seed production, but also show strong combining ability with more than 85% survival rate by grafting. The technology and method which graft the scion of Korean Pine to the rootstock of Pinus sylvesstris. Var. mongolica and Pinus desiflora are provided in order to establish clonal forest in seed production of this species. It also reveals the physiological mechanism how the rootstock from other species effects the scion from Korea pine. The result indicates that grafting between different species makes the grafts with higher physiological activation, in which the net photosynthetic efficiency improves 133.5%, water utilization reaches 110.01% and leaf area increases 39.8%, thus stimulating the growth and development of the grafts.A new grafting method what is the grafting with short branches (needle bunch) as scions is developed to improve the deficiency to the normal veneer graft, as well as to meet the needs of grafting technology of conifer species. In grafting with short branches, the needle bunch from the low part of soft branches of the same year are used as scions, and some techniques are used to accelerate the grafts sprouting such as cutting rootstocks etc. By this grafting method, the sprouting and survival rate reach 75% and 80% respectively, as well as propagation coefficient is 30-40 times compared to the normal grafting method.It also reports that there is great influence to seedling's growth and seed production because of different age between the rootstock and scion. It is effective to short seed production age by using higher rootstock in 1.6-1.8m. In Heilongjiang province, the best time for grafting is the spring from April 20 to May 20, and the seed production autumn from August 15 to August 30 with grafting immediately after collecting the scions. |
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