《石栗光合生理生态特性研究》-毕业论文（设计）.doc

PAGE PAGE 9 嘉应学院生命科学学院本科毕业论文 石栗光合生理生态特性研究 二零一二年二月 A Dissertation Submitted to Jiaying University For the Degree of Undergraduate of Bioscience Candidate： Supervisor： Department of Biology Jiaying University Meizhou,Guangdong,P.R.China,514015 摘要 采用Li-6400便携式光合作用系统（LI-COR.Lincoln,Nebrasks,USA）对石栗光合生理特性进行研究，结果表明：1）夏天，在没有遮阴的条件下，石栗的日变化呈典型的双峰曲线，具有明显的光合午休现象，最高峰出现在11:00，其最大净光合速率为5.946μmol·m-2·s-1，石栗为低补偿点、高饱和点植物，其光补偿点为6.17μmol·m-2·s-1，光饱和点位900μmol·m-2·s-1左右，其对光照的适应范围较宽。（2）石栗的最大羧化效率为：0.036，CO2补偿点为：107.86μmol·mol-1，且随着CO2浓度的不断升高，在0-2000范围内，石栗没有出现明显的CO2饱和点。（3）对石栗不同叶位叶片净光合速率的测定结果是：净光合速率从上至下叶片净光合速率是下降的。 关键词：石栗，日变化，光响应，二氧化碳响应，叶位 Ⅰ Ⅰ Abstract The photosynehetic physiological characteristics of Aleurites moluccana were studied with a Li-6400 (LI-COR. Lincoln, Nebraska, USA) portable photosynthesis system. The rusults show that under open conditions without shade, the diurnal change of net photosynthetic rate of Aleurites moluccana could be expressed as a double- peak curve and shouwed a clear phenomenon of midday depression in photosynthesis. The maximum photosynthetic rate (5.946μmol·m-2·s-1) appeared at 11:00 AM during the summer. Aleurites moluccana is a plant of light compensation points and light saturation point, the light compensation points were 6.17μmol·m-2·s-1 and the light saturation point 900μmol·m-2·s-1. The Aleurites moluccana’s range of light adapt to a broader. The carboxylation efficiency were 0.036 and the CO2 compensate concentration of photosynthesis were 107.86 μmol·mol-1With the CO2 increasing, it didn’t show appear CO2 saturate concentration point of photosynthesis range from 0 to 2000. The photosynthetic rate of last three leaves (first Leaf , L2 and L3) on Aleurites moluccana were reduced. Key word: Aleurites moluccana ; diurnal changes ; light response ; CO2 response ; leaf position 目录 摘要 Abstract TOC \o 1-3 \h \z \u HYPERLINK \l _Toc319048491 摘要： Ⅰ HYPERLINK \l _Toc319048492 Abstract Ⅱ HYPERLINK \l _Toc319048493 第一章 前言 PAGEREF _Toc319048