冠层部位对三倍体毛白杨光合生理特性的影响  

Effects of canopy position on photosynthesis physiological characteristics of triploid clones of Populus tomentosa

作　　者：富丰珍[1] 徐程扬[1] 李广德[1] 贾黎明[1] 

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室,北京100083

出　　处：《中南林业科技大学学报》2010年第3期95-99,共5页Journal of Central South University of Forestry & Technology

基　　金："十一五"国家科技支撑计划课题"三倍体毛白杨速生纸浆林可持续经营管理技术研究与示范"(2006BAD32B02-02)

摘　　要：利用新的光响应模型对纸浆林三倍体毛白杨冠层垂直与水平方向上的光合作用进行了研究,其结果为：三倍体毛白杨冠层不同部位叶片的光饱和点（LSP）在760~1 100μmol.m-2.s-1之间,光补偿点（LCP）在15~32μmol.m-2.s-1之间,最大净光合速率（Pmax）为17.4μmol.m-2.s-1,同时暗呼吸速率（Rd）的最大值不超过2.95μmol.m-2.s-1,表观量子效率（α）最大值为0.108 mol.mol-1;树冠上层、中层和枝条外部叶片LSP、LCP和Rd较其它部位高,Pmax和α均随着树冠部位的下降而下降;冠层上部、中部与枝条的外部叶片的水分利用效率（RWUE）、蒸腾速率（Tr）、气孔导度（Gs）和胞间二氧化碳浓度（Ci）较其它部位的高,且冠层各部位的Tr、Gs和Ci均存在显著的差异性。Canopy photosynthesis of triploid clones Populus tomentosa was analyzed.The results show that in different layers of the canopy,light saturation point（LSP） changed from 760 μmol·m-2·s-1 to 1 100 μmol·m-2·s-1,light compensation point（LCP） from 15 μmol·m-2·s-1 to 32 μmol·m-2·s-1,the maximum of photosynthesis rate（Pmax）,dark respiration（Rd） and apparent quantum yield（α） were 17.4 μmol·m-2·s-1,2.95 μmol·m-2·s-1,0.108 mol·mol-1,respectively;Leaves at the top,middle of canopy and outside of branch,the LSP,LCP and Rd were the highest,Pmax and α decreased with decreasing depth in the canopy.The leaves of RWUE,Tr,Gs and Ci were maximum at the top,middle of canopy and outside of branch as well.There were significantly differences in different layers in the canopy of triploid clones Populus tomentosa.

关 键 词：植物生理学 三倍体毛白杨 光响应模型 冠层 光合生理特性 

分 类 号：S792.117[农业科学—林木遗传育种] Q945.11[农业科学—林学]