The Research Of Cutting Propagation Technique And Cutting Rooting Function To Picea Crassifolia Kom

Picea crassifolia Kom is a kind of proper forest social tree speciesin the northeast of Qingzhang altiplano in China ,it is also an important plantation and city virescence tree species in the northweast of our country.However, the growth of Qinghai spruce seedlings is quite slowly during its young period flourishing seed-production period is so late, from establishment to harvesting for seed orchard will go on for a long time ,these make the demand for well-bred seedlings of Qinghai spruce exceeds supply.At present , a lot of counties in the world are trying to increase reliable genetic plus with larde-scale vegetative propagating the best hybrided species and practicing clonal plantation. Some key techniques and measures for cutting orchard establishment and cutting propagation of Picea crassifolia Kom were researched in this paper,meanwhile, it will widen further the road for the development of spruce clonal forest.Cuttings from the older trees root quite difficultly ,different treatments applying to 5-year-old or 7-year-old stocks by pruning and smearing buds on leaders and lateral branches with different growth ragulator and different concentration's 6BA and GA3 were practiced in this experiment with different methods, some techniques and correspondingly effective meatures to cutting orchard establishment and development of Picea crassifolia Kom.The data of all investigation indices to spruce stocks treated show: pruning method to decapite leaders and lateral branches with lateral buds is the best one to estiblishment and development of cutting orchard of Picea crassifolia Kom, it is more practicable to make the whole mother-plants grow and develop fully.Prunning can significantly increase the number of buds on the shoots.6BA and GA3 also can better prompt the bud and branches' growth and development of Picea crassifolia Kom. Chou-zhibao is the worst treatment regulator ,it even,to some sense,had controlled the budbreak or shoot's extension of Picea crassifolia Kom.Beca.use of only producing less branches ,the pruning only preserving 3-6 buds is not suitable to estiblishment and development of Picea crassifolia Kom.In order to resolve the problem of cuttings hard rooting in large-scale cutting propagation of Picea crassifolia Kom, different hormones, such as ABTi > IBA, NAA and their 200ppm mixed solutions and so forth, are used in this experiment to treat the hardwood cuttings of Picea crassifolia Kom within different treatment time.and then those cuttings were insert these cuttings into medium, after 75 days, rooting type, difference of rooting characteristics, situation of budbreak and rotting status of cuttings' base had been investagated, all results show: Three rooting types of hardwood cuttings of Picea crassifolia Kom are discovered,respectively rooting from bark, rooting from callus and rooting from the tow-way (named from bark and callus). Comparing the difference of rooting, breaking bud and rotting in the base of cuttings among different treatments with different hormones and their mixed solutions to I-year-old hardwood shoots in Picea crassifolia Kom. Finding out the best hormonal treatment to prompt cuttings to produce most and best roots is B61 (IBA250ppm 12h), however, considering cuttings' property ,the best treatment among the whole experimentation is H12 (EBA 250ppm 4h), which is practiced with the downside branches from 7-year-old mother-plants.Because of IBA better treatment effect, EBA treatments to influence the hardwood cuttings rooting of Picea crassifolia Kom were researched more detailedly in this paper. Results show: the rooting rate is increasing with treatment time prolonging under lower cncentration condition; the rooting rate is at the beginning increasing and then decreasing when IBA concentration is higher. The rooting rate and root effect index > mean rooting number and sum root length present all significant positive correlation,but this is not completely same, all indexes will eventually determine stock quality together. At the same time, the relationship between the budbreak of the apical buds and the rooting of cuttings was discussed: the apical shoots be helpful to cuttings rooting to a certain extent.Hardwood cutting rooting of Qinghai spruce exist age effect and position effect, hardwood cutting rooting rate and root effect index of Qinghai spruce both are increasing with mother-plants aged increase; the rooting rate and root effect index of branches from lower crown are significant higher than that of branches from higher crown;the rooting effect of cuttings from first-order lateral branches is better than that of cuttings from second -order lateral branches, and their rooting effect both are better than apical shoots. As results...