摘要
为了研究纸浆林三倍体毛白杨树冠方向、垂直和水平层次上叶片光合特性的空间分异性,利用LI—6400光合测定系统测定树冠各部位叶片对光的利用效率。其结果为:光饱和点(LS,P)变化幅度597.5～1 354.5μmol.(m2.s)-1,光补偿点(LC,P)变化幅度11.6～42.0μmol.(m2.s)-1;树冠西向叶、冠层中部与上部叶和枝条外部叶的LS,P、LC,P和最大净光合速率(Pmax)达到最高值;各光合参数在整个树冠水平上存在极显著的差异性。表明三倍体毛白杨叶片因在树冠上着生位置的不同,对光的利用效率不同,有利于合理地进行树冠的冠层管理。
An experiment was conducted to determine the photosynthetic variability of orientation, vertical and horizontal canopy of triploid Populus tomentosa. The LI-6400 was used to measure the photosynthetic utilization efficiency of the leaves in the different parts. The light saturation point （Ls,e） changes from 597.5μmol·（m2·s）^-1 to 1354.5μmol·（m2·s）^-1, the light compensation point （Lc,p） from 11.6μmol·（m2·s）^-1 to 42.0μmol·（m2·s）^-1. Ls,p, Lc,p and the maxi- mum photosynthesis rates （Pmax） of the leaves reach peak at west, middle and outer positions in the canopy. In the whole canopy, there is significant difference among photosynthesis parameters of different parts. The photosynthetic utilization ef- ficiency of triploid P. tomentosa in different leave position is different in the canopy. Therefore, the utilization efficiency can be conducive to the canopy management.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2013年第5期44-46,80,共4页
Journal of Northeast Forestry University
基金
国家林业公益性行业科研专项经费重大项目(201004004)
北京林业大学"985"优势学科创新平台开放基金(000-1108003)
关键词
三倍体毛白杨
冠层
光合特性
空间分异性
Triploid Populus tomentosa
Canopy
Photosynthesis
Spatial variability
