Studies On The Phytocoenosium Feature And Propagation Of Cerasus Cerasoides Var. Campanulata

Studied basically on wild　Cerasus cerasoides var. campanulata community characteristics, its regeneration by tissue culture and its seed germination in the paper in order to exploit its ornament value. First, summarized systematically about Cerasus (including Cerasus cerasoides var. campanulata)systematic, morphological, ecological, cultural and seed physiological researches done already.Some issues to be solved are put forward about Cerasus exploitage in the paper. Researched focally on the characteristics of Cerasus cerasoides var. campanulata community chosen in Chongyi county, Jiangxi province.Overall analysis for the first time of species components, species frequency, lifeform, importance value(IV),population age structure, population dynamics and species diversity.Analysis of species components of 6 plots(3000m2) indicated that stem numbers(1588) of 20 dominant families---Lauraceae, Theaceae, Rosaceae,, Fagaceae, Hamameliaceae and so on ,accounted for 91% of all stem numbers(1745).Monogenera, monocultures accounted for majority in the communities, typical tropics genera existence in the communities showed the communities transitive trend to the tropical forest type..By analysis of IV of dominant species, Loropetalum chinense , Cerasus cerasoides var. campanulata, Camellia oleifera and Phyllostachy adulis ranked first(IV 17.96 , 17.89 , 17.42 , 15.92 respectively).Population age structure analysis indicated that Cerasus cerasoides var. campanulata, Castanopsis fargesii, Cuninghamia lanceolata, Pinus massoniana, Choerospondias axillaries and Toxicodendron vernicifluum were declining populations. Photinia davidsoniae,Daphniphyllum oldhamii,Loropetalum chinense and Camellia oleifera were growing populations.The age classes of Cerasus cerasoides var. campanulata mainly distributed at medium age classes(7.5cm≤D<22.5cm).The whole survivorship curve of Cerasus cerasoides var. campanulata deviated DeeveyⅢtype for its population higher death rate in the early period of time of life and great shortage of seedlings in its forests.Disturbance had a great effect on species diversity.It was advised that medium disturbance and forest gaps were helpful to the normal succession of Cerasus cerasoides var. campanulata population. Shoots derived from sterile seedlings were obtained by cultivating tender plants---seeds.Studied mainly on the combinations of phytohormones and mediums choice. The better combination of phytohormones was MS+6-BA1.0+NAA0.1 for inducing axillary buds,the buds rate of regeneration was 3.121,buds 0.673cm high averagely.The better medium was 1/2MS+6-BA1.0+NAA0.1+GA30.5+Inositol 25 for buds regeneration and lengthening,the coefficient of proliferated shoots was 4.7,buds 1.314cm high averagely.With 5 successive subculture the coefficient of proliferated shoots was 7.31, clumb shoots rate of regeneration 81.0%,which could meet the need of plenty of propagation.Shoots derived from axillary and lateral buds could form roots readily on 1/2MS+NAA0.2+IBA0.8+6-BA0.05—0.5 medium that was the most appropriate after 3 days culture in the dark,rooting rate was 90.0%. Seed germination experiments showed that stratification storage in low temperature and sand moistened could break dormancy and enhance germination rate of Cerasus cerasoides var. campanulata seeds.The seeds, stored in moistened sand for 2 months, germination rate was 91.7%,while seeds stored in the dried normal condition for 4 months declined to 39.3%,17.0%for 6 months. Seed coat had an inhibitory effect on seed germination,which possibly inherent phytohormones caused so. It was suggested that combining seeds removed seed coats ,which could cause seed germination ,with tissue culture could regenerate plantlets numerously.