丰举树木材的发育解剖学研究.pdfVIP

第 27 卷第 3 期 南 京 林业大 学学 报( 自 然科 学 版 Vol. 27 , No . 3 2003 年 5 月 Journal of N anjing Forestry University( N atural Sciences Edition) M ay . , 2003 丰举树木材的发育解剖学研究 赵旺兔，甘小洪，丁雨龙* (南京林业大学森林资源与环境学院，江苏 南京 210037) 摘要:应用多种制片方法对桦树木材的发育解剖学进行了研究。结果表明:桦树木材为环孔 材，年轮明显;早材部分管孔由 1- 2 列导管分子呈环状排列，而晚材部分则由多个螺纹维管管 胞和小导管分子组成管孔团，木纤维径向整齐排列， 其含量在边材部分较少，而在心材部分较 多，这表明样树在不同生长期形成层分化的各种类型细胞的比例不同;木射线异形多列，由横 卧细胞构成主体，而由方形细胞或直立细胞构成射线的边缘部分，形成多列射线的单列尾端; 轴向薄壁细胞傍管型环管状。 小导管分子和维管管胞具摒、纹加厚导管在心材中为侵填体填 充而增加了木材的耐腐性。 关键词: 桦树;木材;发育解剖 中图分类号 S78 1. 1 文献标识码:A 文章编号: 1000- 2006(2003)03- 0039- 05 An Anatomic Study on the Wood Development of Zelkova schneideriana ZHAO Wang了 tu， GAN Xiaσhong， DIN G Y u- long * ( College of Forest R臼ources and Environment Nanjing For臼try U niversit y, Nanjing 210037 , China) Abstract With several methods , the developmental anatomy of the wood of Zelkovα schneideriαnαwas studied . The results are as follows: The wood of Zelkovα schneideriαnαis ring porous , and its annual ring is very distinct. The pore pattern of the early wood is ring arrangment which is composed of 1- 2 rows vessel elements , and the pore pattern of the late wood is pore cluster w hich is composed of many spiral vascular tra- cheid and small vessel elements. The fibers are radially arranged. The content of fiber in sap wood is less than that in hearty wood , w hich indicate that the rate of different tissues differentiated from cambium varies in different growth periods. The wood ray is heterogeneous and multiseriate ray. The main parts are made up of procumbent cells , and the marginal ray cells are squared cells or upright cells that for