滩地淹水胁迫对杨树生长与木材显微结构的影响  

The Effects of Flooding Stress on Growth and Wood Microstructure of Poplar

作　　者：汤玉喜[1] 刘友全[1] 吴立勋[2] 吴敏[2] 

机构地区：[1]中南林学院,湖南长沙410004 [2]湖南省林业科学院,湖南长沙410004

出　　处：《中南林学院学报》2005年第6期29-33,共5页Journal of Central South Forestry University

基　　金：国家"十五"科技攻关"中国森林生态网络体系建设研究(2002BA516A16-06)"项目部分内容

摘　　要：对5种不同淹水时间类型滩地1～10年生杨树单株材积生长动态进行了分析.结果表明:不同类型之间单株材积生长量均存在显著差异,且随着林龄增长,其差异逐步减小;不同淹水胁迫下,当年年轮宽度、纤维细胞数量、木材基本密度均存在显著差异,纤维长度和宽度差异不显著;杨树年轮宽度与径向纤维细胞数、导管数、径向纤维比量呈正相关;随淹水胁迫程度加深,当年形成层细胞分裂受到了显著抑制,纤维细胞以及导管数量减少,林木径向生长量下降,径向导管比量提高,纤维比量下降,细胞壁腔比减小,木材密度明显降低.对5种淹水类型滩地的林木生长进行了系统聚类,合并划分为4种生长类型,对其中3种常规造林宜林类型杨树生长潜力进行了预测.The effects of flooding duration on the growth dynamics of 1-year-old-10-year-old individual volume were studied. The results indicate that remarkable variations existed among different flooding conditions ,and the variations were increasingly reduced as the age increase. The effects of flooding stress on the ring width,the number of fiber cell,the basic density of wood were remarkable, and that on the length and width of fiber cell were not remarkable. The annual ring width of Poplar was positively related to the number of radical fiber cell,number of vessel and fiber proportion. A remarkable restriction on the cambium cell division was formed as the flooding stress strengthened. With the stability of fiber cell size,the reduce of number of fiber cell and vessel led to the decrease of radical growth,while the ratio of cell wall to cavity became smaller result from the radial vessel proportion increased,it caused the decrease of wood basic density. 4 growth types were divided from 5 kinds of sites under different flooding duration,and the growth potential of Poplar for 3 growth types adapt to plantation were calculated through growth model.

关 键 词：森林培育 滩地 年均淹水时间 单株材积 组织细胞 杨树 

分 类 号：S792.11[农业科学—林木遗传育种] S761.1[农业科学—林学]