The Research Of Rejuvenation Techniques To Ancient And Famous Trees In Shanghai

Ancient and famous trees are very important natural resources. They're also precious historical and cultural treasures. Strengthen the protection of ancient and famous tree in Shanghai is an important work and an important sign of development of society.This study is mainly about the research of rejuvenation techniques to ancient trees through steps of researching, selecting spot, experiment, applying, testing relative indexes and conclusion, etc..Blush certain concentration of Forest Carding Solvent on ancient Lacebark Pine can prevent and decrease gummosis of tree. We found that higher concentration of Forest Carding Solvent has better result. If we use other measures together, for example, decreasing wounds, improving the grown environment and soil, using mycorrhiza, maintaining ventilation and transmission, preventing plant diseases and insect pests, etc., the effect will be better.After using mycorrhiza, ancient pine increased its number of photosynthesis organ (needle bunches) and main absorbed organ (roots). It showed that the growth potential of ancient pine is increasing. It meant that applying mycorrhiza has rejuvenated effect on ancient pine.Remove concrete to cover with blue bricks or air bricks is favorable for improving structure of soil, root grown, increasing assimilation products of leaves and improving nearby sight of ancient trees.When we apply cover plants in the reserved area of ancient tree, we should select right kind of cover plant and reasonably apply those plants according to the different circumstances. After using shallow rooted cover plant, leguminous plant and dried tree bark on the reserved area of ancient tree, the landscape is improved absolutely.The best time to graft ancient Gingko tree is at the beginning of leaves unfolded in Spring. Dealing with tree bark, the size and depth of grafted cut and wrapping up will all affect the survival rate of graft. On the other hand, if we graft a weak ancient Gingko tree as early as possible, that will be good to its recover. If an ancient Gingko tree is endangered too long, the survival rate of graft will be lower.If an ancient Gingko tree or ancient Kapor tree has high quantity of chlorophyll, it will be grown better. A grown well ancient tree has high activity of SOD and POD. But, if the normal grown condition of tree is changed, the activity value of SOD, POD in leaves will be higher, especially SOD.