Study Of Acer Plants Adaptive Cultivation

Plants in genus Acer with its unique ornamental valuehas become one of the important development objects in introduction andcultivation. The Yangtze River Basin has large wild relatives resources ofAcer while the cultivation techniques in many species are still blank.Yet ishas not been easy to bred for species adapt to the local conditions, soilenvironment as well as with ornamental characteristics by using theintroduction and domestication work. In this study, three species of Acer,Acer henryi, Acer pubinerve, and Acer davidii were chosen for the research,by the investigation of trees resources, cutting propagation and shadingcontrol techiniques, results showed as:Ⅰ.Resources InvestigationIn order to provide a foundation for optimal seeking material, we tooka systematically analysis and comprehensively assessment on the naturaldistribution and habitats, and then by means of sorting and comparing thephenology and organ’s ornamental characteristics of the introduced Acerspecies from Shanghai Chenshan Botanical Garden. The results ofcomprehensive appraisal showed that Acer henryi, Acer pubinerve andAcer davidii are suitable for growth in the middle and lower reaches ofYangtze River, and furthermore, these are invaluable species to thegreening and vegetable recovery in lower altitude area of low abundance.Ⅱ.Cutting Propagation1. By comparing of the rooting ability, experiments results indicatedthat under the same condition, the endogenous rooting ability from strongto weak is that Acer davidii, Acer pubinerve andAcer henryi.2. By using high concentrations of exogenous hormone can increasethe rooting rate and quality in cutting but this is not the best choice. A lower hormone concentrations are more conducive to enhance the rootingrate and quality. In this test we found the mixed Naphthalene AceticAcid(NAA) of500mg/L with2unit of Indole Butyric Acid(IBA) is theoptimum formula, which can not only enhance the survival rate of cuttingsbut also increase the rooting number in plant bark and callus.Ⅲ Shading Control1.1. With the improvement of more shading the increase or decreasein leaf water content and dry matter accumulation make differentcontributions to the increase of leaf weight. Across different species aftershading treatment, and found that the specific leaf weight(SLW)fluctuates, the SLW in Acer davidii and Acer henryi occur a maximum at45%shading, Acer pubinerve has a maximus SLW at90%shading; Thusspeculated that strong light and moderate light is beneficial to theformation and accumulation of blade material, it also shows that leafbiomass would be a strong demonstration for its adaptation degree to lightenvironment.2. Experiment results show that the influence of shading treatment onthe changing of leaf area is remarkable, leaf area of Acer henryi and Acerpubinerve growing bigger with the increase of shading, leaf area of Acerdavidii reach maximal under full sunlight. Large leaf blade is of greatsignificance to improve the ornamental value of leaves, however, fullsunlight or excessive sunlight should result in the atrophy and ealier waneas to Acer henryi and Acer pubinerve. Acer davidii is demonstrated a goodadaptation to different light intensity.In conclusion, light is an important factor for the growth of leaf blade.Appropriate sunlight can not only provide energy for growth, but alsomaintain normal physiological function of leaves. Therefore, in thepractical application of these three species, the shading method should beconsidered with the accumulation of biomass, enhanced resistant,increased leaf area and improved ornamental values.