Study On Seedling Growth Rhythm Of Acer Saccharum Marsh.

Sugar maple(Acer saccharum Marsh)not only has colorful autumn leaves,but also has density crown.Most important is that it is the natural source of the sap of maple syrup,which has a special health value.The paper studied the seedling introduced from different provenances of Canada through sugar maple seed propagation and seedling growth of technologies to explore the cultural practices and physiological characteristics.(1)Sugar maple three kinds of sources Toronto south central Quebec City,north of Winnipeg growth law to explore,investigate its seedling growth law a "three-point method" estimate shuttle sugar maple seedling growth in use Logistic equation seedlings annual growth process fitting,curve fitting process.Sugar maple seedlings annual growth rhythm follow Logistic curve by fitting equations can be simulated in the growth of sugar maple seedlings annual,predictable growth of seedling height and diameter during growth,contribute to the seedlings growth dynamic tracking and management,is conducive to cultivating high-quality seedlings.(2)Annual seedlings can be divided into different growth stages,namely the initial growth,growth and growth peak stage.Fast-growing period of height,diameter growth of total annual growth of 76.4% and 82.3%,respectively.(3)In the study of grafting,local maple as rootstock,using cut connection and cleft grafting method grafting sugar maple,two and three year full of healthy branches as scion were grafted 32,wherein each splicing and cleft grafting 16.Cleft grafting and cutting grafting survival rate were 12.5% and 6.25%,graft survival rate in different seasons of autumn and spring,respectively,18.75% and12.25%,scion of Different Ages biennial and triennial survival rate were 15.75 % and0%,grafting of different measures,erection survival Shed and open-air film covering12.25% and 0%.(4)management of summering in the summer when the outdoor temperature exceeds 34? erection of shade nets to be summering management,respectively,using light transmittance of 80%,60%,40% and full light shade nets under different conditions,respectively sugar maple seedlings shade treatments summering preservation rates were 81%,94%,88%,76%;and take shade net seedling victimization showed only a stub that is more serious burns,all light is the whole plant severe burns.Description should be appropriate for the summer sugar mapleseedling shading treatment.(5)Pest control measures,pests and diseases were seen as blight,powdery mildew and A.glabripennis.Leaf blight generally occurs in July-September,before the onset can be sprayed 75% chlorothalonil WP 800 times,after the onset of symptoms spraying 70% thiophanate-methyl WP 1000 times.Sheng powdery mildew disease,it can be sprayed 15% triadimefon 1000 times,2% antimycotic agent 200 times,10% of polymyxin 1000 to 1500 times.By powdery mildew and leaf blight in violation of sugar maple seedlings,prevention and treatment to save 84% and 95%.A.glabripennis take 8 percent against major green Vario II,200 times spraying trunk.Every 15 to 20 days,spray,and even spray three times;the use of knapsack sprayer evenly sprayed on the trunk,in the larval activity,and can find fresh excrement wormholes,then insert the top-down aluminum phosphide or phosphorus zinc poisoning sign or inject monocrotophos EC liquid and sealed with Wong.Prevention after saving rate of 91%.(6)Improve test sugar maple leaf,plant growth regulators selection,2-4D,GA and IBA on leaf color improving effect was significantly higher than phosphoric acid and hydrochloric acid.Configuration concentration concentration 1: 250 leaf color is better than improving1: 100.After spraying plant growth regulator and the control group 56% discoloration.