长白山地区蒙古栎光合特性  

Photosynthetic Characteristics of Quercus mongolica in Region of Changbai Mountain

作　　者：吴家兵[1] 关德新[1] 张弥[1] 施婷婷[1] 韩士杰[1] 金昌杰[1] 

机构地区：[1]中国科学院沈阳应用生态研究所

出　　处：《中国科学院研究生院学报》2006年第4期548-554,共7页Journal of the Graduate School of the Chinese Academy of Sciences

基　　金：国家自然科学基金(30370293);中国科学院知识创新工程重大项目(KZCX1-SW-01-01A);中国科学院沈阳应用生态研究所领域前沿项目资助

摘　　要：基于单叶尺度上的光强-光合响应以及CO2-光合响应测定,对长白山地区蒙古栎成树和幼树的光合特性分别进行了研究.结果表明,蒙古栎成树的光补偿点Lcp为21μmol/(m2·s),光饱和点Lsp为1564μmol/(m2·s),表观量子效率α为0·045;幼树的Lcp、Lsp、α以及CO2补偿点、饱和点分别为29μmol/(m2·s)、1581μmol/(m2·s)、0·049、73μmol/mol、625μmol/mol.幼树和成树具有相似的光响应特征,但前者的光合同化能力要高于后者.蒙古栎具有典型的喜光性,但对高光的利用效率要低于弱光.The photosynthetic characteristics of Quercus mongolica were studied based on the measurement of leaves photosynthesis under artificial controlled conditions of light intensities and CO2 concentration in the region of Changhai Mountain. For mature trees, the light compensation point Lop, light saturation point L,p and apparent quantum efficiency a were 21 μmol/（ m^2.s）, 1564μmol/（m^2 .s） and 0. 045, respectively. For young trees, the values of Lep, Lsp, α, and CO2 compensation point, CO2 saturation point were 29μmol/（m^2. s）, 1581μmol/（ m^2. s） ,0.049, 73μmol/mol,625μmol/mol, respectively. The photosynthesis assimilation of young trees was more active than that of mature trees. It suggested that the Quercus mongolica was intrinsically helophytic plant, but the use efficiency of light quantum was low in the strong light condition. The results also showed that the diurnal variations of net photosynthetic rote of young trees assume a typical midday depression pattem. Strong light intensity and high VPD were the key factors.

关 键 词：蒙古栎 光合特性 光响应曲线 Li-6400光合作用仪 

分 类 号：S791[农业科学—林木遗传育种]