Effects Of Forest Management Measureson Flowering And Fruiting Of Cypress Seed Orchard

Seed orchard is a special artificial forest for the purpose of producing excellent genetic quality and rapidly-growing and high-yield seeds,and from the point of view of forest cultivation,it is necessary to determine its cultivation characteristics according to its use and take corresponding management measures.At present,China's early construction of seed orchard are in accordance with the timber forest model,the afforestation density is large,forest closed degree is high,resulting in mother tree canopy intersection,serious lack of light,serious natural branching,mother tree height of the strong layer increased significantly,some mother tree only left the strong layer on the top,greatly affected the seed garden production,and because the tree body is not dwarf,Seed harvesting is difficult,resulting in seed production can not reach the expected yield,it is difficult to play the advantages of seed garden.Therefore,in order to fully excavate the production potential of the existing seed garden,the method of mixed uniform design was used to study influence of the truncated crown?X₁?,gibberellin GA₃?X₂?,Gibberellin GA₄₊₇?X₃?,root cutting?X₄?,nitrogen fertilizer?X₅?,phosphate fertilizer?X₆?and potassium fertilizer?X₇?on the 30 years old cedar mother tree flowering and fruit of jingu national cedar good seed Base in Santai County,Sichuan Province to provide scientific reference for the operation and management of cedar Seed orchard.The main findings are as follows:?1?A quadratic polynomial regression model for the number of female flowers?Y₁?,the proportion of male and female flowers?Y₂?,the number?Y₃?and quality?Y₄?of fruiting of cypress was established by forest measures?X?.The regression model can be used for correlation analysis,single factor analysis,interaction analysis and formula optimization.?2?GA₄₊₇,root cutting,nitrogen fertilizer,GA₃,crown cutting,potassium fertilizer,phosphate fertilizer to cypress female flower number and female to male flower ratio decreased sequentially.The correlation of GA₃,phosphate fertilizer,GA₄₊₇,potassium fertilizer,nitrogen fertilizer,cutting crown and cutting root to the quantity and quality of cypress decreased sequentially.?3?Through the analysis of the dimension reduction,the change trend of forest measures?X?and the number of female flowers,the proportion of male and female flowers,the number of female and male flowers,the number and quality of fruiting quantity and quality,were obtained at the level of 1,2,3,4,respectively.With the increase of crown cutting degree,the number of female flowers and the ratio of male and female flowers first increased and then decreased.With the increase of GA₃,the number of female flowers and the ratio of male flowers to female flowers in level 4 increased,while the number of female flowers in level 2,level 3 and level 1decreased.With the increase of GA₄₊₇,the number of female flowers and the ratio of male and female flowers in level 3 and level 4 showed an upward trend,while level 1showed a downward trend and level 2 showed no significant change.With the increase of root cutting,the number of female flowers and the ratio of male flowers to female flowers at level 4 increased,while the number of female flowers at level 2,level 3 and level 1 decreased.With the increase of nitrogen fertilizer,the number of female flowers and the ratio of male and female flowers decreased first and then increased.With the increase of phosphate fertilizer,the number of female flowers and the ratio of male flowers to female flowers first increased and then decreased,showing an overall increasing trend.With the increase of potash fertilizer,the number of female flowers and the proportion of male flowers in level 3 and level 4 increased,while the number of female flowers in level 2 and level 3 decreased.With the increase of the cutting crown,the quantity and quality of level 3 and level4 were on the rise,level 2 and level 3 were on the decline,and level 4 was the best.With the increase of GA₃,the quantity and quality of burners were on the rise.With the increase of GA₄₊₇,the quantity and quality of level 1 and level 3 were on the rise,while level 2 and level 4 were on the decline.With the increase of root cutting,the quantity and quality of level 3 and level 4 were on the rise,while level 1 and level 2 were on the decline.With the increase of nitrogen fertilizer,the quantity and quality of seed at level3 and level 4 were on the rise,while those at level 1 and 2 were on the decline.With the increase of phosphate fertilizer,the quantity and quality of level 3 and level 4 were on the rise,level 1 was on the decline,and level 2 was on the decline and then on the rise.With the increase of potash fertilizer,the quantity and quality of seed at level 3and level 4 showed an increasing trend,level 1 showed a decreasing trend,and level 2showed no obvious change.?4?The interaction between crown cutting-GA₃,GA₄₊₇-phosphate fertilizer and crown cutting-potash fertilizer had a strong correlation with the number of female flowers and the proportion of male and female flowers in cympanaceae,and the contour map was saddle-shaped or oval,indicating that the interaction was significant.The interaction between crown cutting-potash fertilizer had a positive correlation with the number of female flowers and the proportion of male flowers.The interaction between crown cutting-pfertilizer,GA₄₊₇-kfertilizer and GA₃-pfertilizer on three plantation measures had a strong correlation with the quantity and quality of seedlings,and the contour map was saddle-shaped or oval,indicating that the interaction was significant,among which the interaction of GA3-p fertilizer had a positive correlation with the quantity and quality of seedlings.?5?when the crown of the three-wheeled trunk is reserved for 6 percent,the gibberellin GA₃ 90 mg/N,the GA₄₊₇ 89.2 mg/N,the root cutting week,the application of the nitrogen fertilizer 105g/N,the phosphate fertilizer 140g/N and the potassium fertilizer 138g/N can be applied,The proportion of male and female flowers was 0.73,the number of solid was 32,the solid mass was 23.02 g,and the total evaluation was397.6,it is 240 points higher than the average value of experimental treatment.Forest management measures,such as cutting off crown,fertilization and cutting root,have significant effects on flowering and fruiting of mother trees in cedar seed orchard.Scientific management can promote flowering and fruiting of cedar mother trees.The results can be used as reference for seed orchard management.