两种林龄四川桤木的光合特性研究  

Photosynthesis characteristics of Alnus cremastogyne of two stand age

作　　者：文仕知[1] 韦铄星[1] 何功秀[1] 杨丽丽[1] 

机构地区：[1]中南林业科技大学林学院,湖南长沙410004

出　　处：《中南林业科技大学学报》2011年第5期52-56,62,共6页Journal of Central South University of Forestry & Technology

基　　金：国家林业公益性行业科研专项(201104009);国家野外科学观测研究站项目(2010-05);国家林业局项目(201042);湖南省教育厅项目(湘财教字[2010]70号);长沙市科技局创新平台项目(K1003009-61)

摘　　要：对2种林龄(3年生、8年生)四川桤木Alnus crematogyme生长期的光合速率进行测定分析,结果表明:3年生四川桤木上、下两部位年均日变化呈单峰型,峰值均出现在12:00,8年生桤木为双峰型,峰值出现在10:00和16:00,2种桤木年均日净光合速率均表现为上部叶>下部叶;8年生桤木各季节日净光合速率受到方位影响较3年生大,2种林龄桤木各季节日净光合速率大小排列顺序都为6月>4月>9月>10月,8年生四川桤木4个方位的年均日净光合速率值均大于3年生四川桤木;四川桤木2种林龄、不同部位、不同月份3个因素内部处理之间存在显著的差异性(P=0.017),林龄和月份两个因素之间交互作用显著,而其他两个交互作用均未达到5%的显著差异水平。Photosynthetic rate of growing season about the two stand age（3-year-old,8-year-old） of Alnus crematogyme were measured and analyzed.The results show that： 3-year-old Alnus,the adjacent two parts of an average diurnal variation showed a single peak,peak occurred at 12：00.8-year-old Alnus showed two peaks,peak at 10：00 and 16：00.The two Alnus＇s annual net photosynthetic rate of upper leaves was higher than the lower leaves;the 8-year-old Alnus＇s Pn values in seasons was much more bigger than 3-year-old ones,the order from large to small of both plantation Alnus＇s Pn values of each season affeced by orientations was： June April September October,Pn of 8-year-old Alnus in four directions was higher than that of 3-year-old Alnus.There was significant difference（p= 0.017） between the three factors including two stand ages,different part of the leaves,different seasons.There was significant interaction between stand age and season,while no significant interactions between the other two factors.

关 键 词：四川桤木 净光合速率 两种林龄 日变化 季节变化 

分 类 号：S792.14[农业科学—林木遗传育种] Q945.11[农业科学—林学]