尾叶桉无性系苗期光合作用特性研究  

Study on Photosynthesis Characteristics of Eucalyptus urophylla Clone Seedlings

作　　者：陆钊华[1] 徐建民[1] 陈儒香[1] 李光友[1] 白嘉雨[1] 

机构地区：[1]中国林业科学研究院热带林业研究所,广东广州510520

出　　处：《安徽农业科学》2009年第27期13082-13086,共5页Journal of Anhui Agricultural Sciences

基　　金：国家十一五科技支持专题(2006BAD01A15-4)

摘　　要：[目的]探索尾叶桉无性系苗期光合作用指标与生长指标间的关系。[方法]以20个尾叶桉无性系为材料，测定了扦插90d苗木的第3、4片叶的光合作用生理指标，3年后调查了无性系的树高、胸径、冠幅、干形和分枝性状。[结果]尾叶按无性系的净光合速率与光强呈显著的二次曲线关系，光饱和点为1967．7μmol／（m2·s）；不同无性系的光合生理指标存在显著差异，No．23无性系的净光合速率最高（17．178p,moL／（m2·s）），为总体平均值的119．50％；净光合速率、气孔导度的日变化进程具有一定的相似性，8：00～16：00期间相对稳定，18：00突降至最低点；胞间CO2浓度的日变化趋势与净光合速率相反；光合作用特性指标与生长指标存在一定程度的正相关关系。[结论]该研究为尾叶桉无性系的早期选择提供了依据。[Objective] The study was to explore the relationship between photosynthesis indexes and growing indexes of Eucalyptus urophyUa clone seedlings. [ Method ] With 20 E. nrophylla clones as the materials, the photosynthesis indexes of the third and the fourth leaf of the seedling inserted for 90 d were determined. And after 3 a, the plant height, stem diameter, crown width, stem form and branching character of the clones were investigated. [ Result] The net photosynthetic rate of E. urophylla clones had conical relationship with the light intensity with light saturation point of 1 967.7 μmol/（ m2· s）. The photosynthesis indexes of different clones were significantly different. The net photosynthesis rate of No. 23 was the highest（ 17. 178 μmoL/（ m2 ·s） ） , being 119.50% of that of the population mean. The diurnal variation of net photosynthesis rate and stomatal conductance had some similarity, and they were stable at 8：00 - 16：00 and were suddenly decreased to the lowest point at 18：00. The diurnal variation of intercellular CO2 concn, was contrary to that of net photosynthesis rate. The photosynthesis indexes had positive relationship with growing indexes in some degree. [ Conclusion ] The study provide the basis for the selection on E urophylla clones.

关 键 词：尾叶桉 无性系 苗期 光合作用 

分 类 号：S792.39[农业科学—林木遗传育种]