普通油茶不同树体结构与光能利用的关系  

Relationship between Tree Composition and Light Utilization of Camellia oleifera

作　　者：段伟华[1] 袁德义[1] 高超[1] 龚春[2] 雷小林[2] 廖婷[1] 

机构地区：[1]中南林业科技大学经济林育种与栽培国家林业局重点实验室,湖南长沙410004 [2]江西省林业科学院,江西南昌330013

出　　处：《林业科学研究》2013年第1期118-122,共5页Forest Research

基　　金：国家林业局推广项目"大果油茶高产新品种示范推广"([2011]21号)

摘　　要：普通油茶（Camellia oleifera Abel．）营养建造与产量形成的生理基础是光合作用，树体结构是形成油茶个体与群体经济产量的基础，培育合理的树体结构是提高油茶光能利用增加生物产量的重要措施之一，通过改善树体结构，提高光合效能，是实现其丰产、稳产的重要途径。In order to explore the suitable tree composition in the cultivation management, 11-year-old Camellia ole- ifera trees were used as the test material, the relative light intensity and net photosynthetic rate in different canopy position of C. oleifera were studied by training and pruning. The results showed that the relative light intensity at the external middle layer of C. oleifera of open center shape, natural roundhead shape and CK were 44. 33%, 28.72% and 25.81% respectively; the relative light intensity at the internal middle layer of C. oleifera of open center shape, natural roundhead shape and CK were 14. 70% , 7.13% and 1.21% respectively. The peak of net photo- synt5 tic rates in different layers and positions of open center shaped C. oleifera were higher than that of the natural roundhead shape. Compared with natural roundhead shaped C. oleifera, the peak of net photosynthetic rate of the external and internal upper layers were 2.47 μmol·m^-2·s^-1 and 0. 43 μmol·m^-2·s^-1 higher, that of the ex- lcrnal and internal middle layers were 1.10 μmol·m^-2·s^-1 and 0. 18 μmol·m^-2·s^-1 higher, that of the external and internal lower layers were 0.32 μmol·m^-2·s^-1 and 1. 44 μmol·m^-2·s^-1higher respectively. Moreover, the net photosynthetic rate of the both shapes were higher than that of the CK. Considering the photosynthetic efficiency, training and pruning C. oleifera to be open center shape had a better effect.

关 键 词：油茶 树体结构 光能利用 整形修剪 

分 类 号：S794.4[农业科学—林木遗传育种]