Studies On The Biological Characters Of Fargesia Yunnanensis

The distribution of F. yunnanensis, growth conditions, application value, developmental changes in cell wall of phloem fiber caps and vegetative propagation were studied. The results are as follows:1. The geographical distribution of F. yunnanensis ranges from the most northern border that locates in Mianning County, Sichuan province to the most southern board that locates in Fengqing county, Yunnan province and the distribution of the lowest altitude is in Qinghe town, Yanbian County. According to the current observation, there mainly have three variation types.2. The vascular bundles in culm of F. yunnanensis have two types-opening and semi-opening types. The radial length/tangential diameter ratio of vascular bundle varied with culm zones and geographic provenances.3. The biomass,the DBH and diameter of culm base of different geographic provenances were determined and compared. It showed that the growth vigor of F. yunnanensis distributed in Jizushan was the best and the growth of bamboo in Baimahe farms was the worst.4. The differences of chemical constituents in culm of F. yunnanensis among different geographic provenances were not significant and the fiber characteristics among different geographic provenances were compared and considered that the bamboos distributed in Jizushan mountain were better to be used as paper-making raw materials.5. The nutrition of bamboo new shoots distributed in different geographic provenances were different.6. Six types of cell wall layering patterns were observed based on light microscopy observations in phloem caps of three years old culms. The fiber cell wall thickening has two ways: (1) the layer thickening of fiber cell wall; (2) the increasing layers of cell wall.7. It is difficult to breed this bamboo in vitro culture and cutting propagations, which confirmed previous research findings and only the seedling of buried separated individual was success.