Study On The Morphological Characteristic Of Cerasus Subhirtella Var. Ascendens In Different Populations And Its Phytocoenosium Feature

The main distribution of Cerasus subhirtella var. ascendens is in the southern part of Yangtse River– about Sichuan, Hubei, Fujian, Anhui, Jiangxi, Jiangsu, Zhejiang et al. The morphological characteristics of C. subhirtella var. ascendens have much variation in different population because of the complicated entironment and widespread distribution. Based on the taxonomy of Cerasus, the paper make emphases on the generalization of taxonomy of C. subhirtella var. ascendens and the research history of plant population variation. The systematic research on variation of C. subhirtella var. ascendens are done with the method of a series of field investigation, reviewing specimens and numerical taxonomy, and its communities are also discovered in the paper. After the final statistic, main results are followings:1) The research advance of Cerasus in taxonomy, morphologic, molecular biology, geological distribution, propagation are reviewed. Mearsure and proposal for exploitation and utilization are presented for the resource of China wild Cerasus plants. What's more, the significance of population in the taxonomy are illustrated, and the method of statistics are suggested to use in the classical taxonomy of C. subhirtella var. ascendens.2) Via studying on the populations in Fujian Wuyi mountain and Jiangsu Baohua mountain , the results shows that the morphological variation is existed in two distributions. The most important effect on the variation is the environment where they locate. The extent of variation is distinct in different distribution, which indicates the morphological variation of Wuyi mountain is more remarkable than Baohua mountain. Meanwhile, the morphological variation in Wuyi mountain is up to the population's level, and Wuyi mountain's is not so distinct which still settle inner population with the continuous points. Finally , regardless of any populations the extent of morphological variation of procreant apparatus is much greater than the nutritional apparatus'.3) All of populations we research are congregated to discuss. By the methods of ANOVA, PCA, UPGMA and EMS, the result indicates that morphological variation of C. subhirtella var. ascendens between Fujian and Jiangsu has distinctly differentiation which we can classify three groups. For one things, the new taxonomical cell of C. subhirtella var. ascendens we can attain and the differentiation among populations of Wuyi mountain are proved. The variety of Cerasus subhirtella are readjusted in the paper---two new varieties Cerasus subhirtella var. platyphyllus and Cerasus subhirtella var. miniflora, and reserving Cerasus subhirtella var. ascendens.4) Three kinds of variety of Cerasus subhirtella communities are studies detailedly from several aspects: species composing, species frequency, community floristic feature, community structure, community diversity and population development. The investigation shows that the community has greatly different between Wuyi Mountain and Baohua Mountain. But from point of view the population development, all of the early cherry population in the community are declining and seedlings can not be found in the forest. Therefore, effective measure should be taken to protect or utilize, or they will vanish in the nature. It is advised that medium disturbance and forestry gaps be helpful to the normal succession of early cherry population.