沙冬青光合速率日变化及其影响因子研究  

Studies on the Diurnal Variations of Net Photosynthesis Rate and the Effect of Environmental Factors on A.mongolicus

作　　者：李禄军[1] 车克钧 蒋志荣[1] 杨占彪[1] 柴成武[1] 邵玲玲[1] 

机构地区：[1]甘肃农业大学林学院,兰州730070 [2]甘肃省白龙江林业管理局,兰州730050

出　　处：《干旱区资源与环境》2007年第5期141-145,共5页Journal of Arid Land Resources and Environment

基　　金：甘肃省南北两山植物资源调查研究(LNLG2005(01))

摘　　要：采用Li-6200光合分析仪,在自然条件下对沙冬青(A.mongolicus(Maxim)Chengf.)光合作用日进程进行了观测,结果表明:在夏季晴天条件下,沙冬青Pn日变化为双峰曲线,峰值分别出现在11:00时和15:00时,具有典型的“光合午休”特征。相关分析和多元回归分析表明,光量子密度和气孔阻力是影响沙冬青叶片Pn日变化的主要生态因子。Diurnal variations of photosynthesis of A. mongolicus were studied under natural conditions by Li -6200 photosynthesis analyzer. The results indicated that in the typical summer sunny days, the curve of diurnal variation of net photosynthetic rate （Pn） was dual--peaked. The peak values appeared at 11： 00 and 15：00 respectively. The first peak value was 6. 031 μmolCO2·m^-2· s^-1 and the second one was 5. 296 μmolCO2·m^-2· s^-1 . There was a clear depression at noon, which was 4. 798 vtmolCO2·m^-2· s^-1 appeared at 13： 00. The analysis of correlation and stepwise multi--regression showed that the main ecological factors affecting photosynthetic diurnal variation of A. mongolicus were photo flux density and stomatal resistance.

关 键 词：沙冬青 光合速率 日变化 光量子密度 气孔阻力 

分 类 号：S718.43[农业科学—林学]