Resources Evaluation Of Magnoliaceae In Hainan Island And Construction Of Magnoliaceae Plant Garden

On the basis of literature review and field investigation,the resources and conservation status of wild Magnoliaceae in Hainan Island were studied.The results showed that there were 14 species of wild Magnoliaceae in Hainan Island.It is mainly distributed in the mountainous area of the central and southern Hainan Island,and is distributed at an altitude of 400 m?1200 m.The present situation and application value of Magnoliaceae in Hainan Island are analyzed and discussed.The application of Magnoliaceae in urban gardens in 11 cities and counties of Hainan was investigated and evaluated.The results showed that there were 3 genera and 10 species of Magnoliaceae in Hainan urban gardens.Among them,Michelia alba was the most widely used,followed by Michelia figo and Magnolia soulangeana,and the species and quantity of Magnolia soulangeana were the most used in Haikou City.The relationship between the growth characteristics and climatic factors of Michelia alba was analyzed in five cities and counties.It was found that the maximum temperature could significantly affect the DBH and crown width of Michelia alba,and it was negatively correlated.The ornamental value was evaluated by Analytic hierarchy process(AHP).The evaluation of Michelia alba,Michelia champaca and Manglietia hainanensis was grade I.Magnolia denudata and Magnolia liliflora were evaluated as grade ?.A comparative study on the growth of Magnoliaceae species introduced in the early stage of the experimental forest garden of Maple Tree in Hainan Province was conducted.The results showed that there was one plant evaluated as I,Manglietia lucida,which had better growth potential and survival rate.The cultivation process of Hainan showed high adaptability.Manglietia yuanensis,Manglietiastrum sinicumum,Magnolia delavayi were evaluated as V,and serious inadaptability appeared in the introduction and cultivation of Magnolia in Hainan.The survival rate was low and the growth potential was weak.It was preliminarily judged that these three plants were not suitable for cultivation in Hainan.By collecting the germplasm resources of Magnoliaceae and cultivating some seedlings of Magnoliaceae,a preliminary construction of Magnolia orchard has been carried out.At present,42 species of Magnoliaceae have been collected.Seedling of Manglietia hainanensis and Parakmeria lotungenensis were studied.The germination rate of Manglietia hainanensis was 78%,and that of Parakmeria lotungenensis was 89%.16 species of Magnoliaceae plants were initially planted in the Magnolia Garden.It was found that the growth potential of Magnolia seedlings with average plant height of 180cm was better than that of Magnolia odoratissima seedlings with average plant height of 60cm.At present,only Magnolia odoratissima had pests and diseases.