Studies On Introduction And Propagation Of Goldenchain Tree And Midland Hawthorn

Goldenchain Tree and Midland Hawthorn are very good ornamental trees. The phenology, growth rhythm and adversity-resistant were investigated after they were introduced into Beijing. The adaptation was analyzed by comparing those and some physiological items to that of some local trees: Sophorajaponica (in the same family with goldenchain tree) and Crataegus pinatifida (in the same genus with midland hawthorn). That would be helpful for making methods of planting and management. The propagation technique of them also was researched.The results as follows:1, The Goldenchain Tree's sprouting time is identical with Sophorajaponica, but the buds opening and development is slow and falling time of leaves are later than that of Sophorajaponica. It prefers the heat and humidity to dry environment. The growth of branch is positive to monthly average temperature. Its ability of droungt-torlerance is strong than that of Sophora japonica. But heat-torlerance and cold-torlerance are weaker than later's.2, Cutting is the best way for Goldenchain propagation. Hardwood cutting picked in the early of spring and dipped in mixture solution of 5000 ppm IBA and 600 ppm NAA or 600 ppm NAA for 5-8 second , with perline as media the rootage rate is 30-33 %. Soft wood cutting picked in autumn and dipped in mixture solution of 2000 ppm IBA and 600 ppm NAA for 5-8 second , with fine sand as media the rootage rate is 55% . Goldenchain also can be propagated by grafting on Labunum alpinum. But using other plants from Leguminosae as rootstocks, no buts survival.3, The date of sprouting and defoliation of Midland Hawthorn are later than that of hawthorn. It prefers high temperature and humidity to dry environment. The growth of branch is positive to monthly precipitation. Compare with hawthorn, the heat-torlerance, droungt-torlerance and cold-torlerance are all weaker. But those are consistent with that of Sophora japonica's.4, Grafting is the best way for Midland Hawthorn propagation. The survival rate of grafting is 80-100% with our local hawthorns as the rootstock. It is difficult topropagate by cutting. Cutting only produces callus but no roots.5, According to the theory of introduction and the behave of those two kinds tree at the first year in Beijing , we draw a rough conclusion: Golenchain Tree and Midland Hawthorn has strong ability to adapt the climate of Beijing. They would growth well through the winter and survive in Beijing after anther 1-2 years' domestication.