不同类型针阔材树木形成层活动规律与木质部细胞分化差异的研究

我国木材资源缺乏，供需矛盾紧张，长远之计是利用人工林木材资源。树木形成层活动规律及其木质部细胞分化过程是研究木材形成的基础。温带树木形成层活动规律研究较多，亚热带和热带地区这方面研究甚少。本项目选择亚热带区域不同类型木材树种湿地松（松科）、池杉（杉科）、侧柏（柏科）、榉树（环孔材）、樟树（半环孔材）和意大利杨（散孔材），对其木材形成过程进行系列解剖观察与特性分析，研究其形成层分生活动规律、次生木质部细胞季节性动态变化、次生木质部细胞数量累积特征、细胞壁木素沉积过程与分布、组织比量变化与气候因子的关系，揭示其维管形成层发生发育的解剖学机理，分析其木材细胞长度与木材密度与气象因子间关系，比较针叶树松杉柏三科间和阔叶树环孔材、散孔材和半环孔材间形成层分生活动规律和木质部细胞分化上的差异，探索其木材形成过程，为亚热带地区主要造林树种木材质量的生物改良、定向培育和木材资源的合理利提供科学理论依据.

In longer term, the utilization of plantation wood is an important way to solve the shortage of wood resources and the tension between wood supply and demand in China. Trees cambium active patterns and their xylem cell differentiation and maturation processes are the foundation of the research on wood formation. Now more attention has been paid to study on trees cambium activities in temperate regions, but very few was found to trees’ in tropical and subtropical regions. Six mainly representative tree species with different wood types planted in subtropical regions of China for industrial wood will be selected to study their wood formation processes and analize their cell anatomical features in this project, which include Pinus Pinus elliottii （Pinaceae）, Taxodium ascendens (Taxodiaceae) , Platycladus orientalis (Cupressaceae ), Zelkova schneideriana (ring-porous wood), Cinnamomum camphora (semi-ring-porous wood), Populus tomentosa (diffuse-porous wood). Their cambium periodicity dividing active patterns, secondary xylem cells seasonal variation, secondary xylem cell numbers accumulated and cell characteristics, cell wall lignin deposition process and distribution patterns and the relationship of wood cell tissues proportion variation to climate factors will be studied in this project. Their anatomical mechanism of vascular cambium growth and development will be exposited. The differences of their cambium dividing activity patterns, cell variate features and their wood formation processes among Pinaceae ,Taxodiaceae, Cupressaceae in coniferous trees and those among ring-porous wood, semi-ring-porous wood and diffuse-porous wood in broad –leaved trees will be compared seperatively.The changes of cell length in cambium periodicity activity and their wood density will be conducted. These results will be used to provide the theory basis for improving wood quality of main tree species’ plantation in subtropical areas and the biological specific directional cultivation of plantation for industrial wood. The consequence of this study is of important significance in the rational utilization of plantation wood and solving the shortage of wood resources in China.