龙须藤净光合速率日变化及其主要影响因子

广西师范大学学报（自然科学版） ›› 2010, Vol. 28 ›› Issue (3): 61-65.

龙须藤净光合速率日变化及其主要影响因子

廖盛厦¹, 李军伟¹, 杨红兰¹, 甘肖梅¹, 梁士楚^1,2

1.广西师范大学生命科学学院,广西桂林541004;
2.广西环境工程与保护评价重点实验室,广西桂林541004

收稿日期:2010-04-28 出版日期:2010-09-20 发布日期:2023-02-06
通讯作者: 梁士楚(1965—),男,广西百色人,广西师范大学教授,博士,硕导。E-mail:gxlsc@sina.com
基金资助:
广西环境工程与保护评价重点实验室研究基金资助项目(桂科能0702Z014);国家重点基础研究发展计划项目(2006CB403207);广西研究生教育创新计划项目(2009106020710M56)

Diurnal Changes of Net Photosynthetic Rate and Influencing Environmental Factors of Bauhinia championii

LIAO Sheng-xia¹, LI Jun-wei¹, YANG Hong-lan¹, GAN Xiao-mei¹, LIANG Shi-chu^1,2

1. College of Life Science,Guangxi Normal University,Guilin Guangxi 541004,China;
2. Environmental Engineering and Protection Evaluating Key Laboratory of Guangxi,Guilin Guangxi 541004,China

Received:2010-04-28 Online:2010-09-20 Published:2023-02-06

摘要/Abstract

摘要： 采用LI-6400型便携式光合仪,对桂林岩溶石山龙须藤Bauhinia championii不同季节净光合速率P_n的日变化进行测定。结果表明,龙须藤P_n日变化曲线春季和冬季呈“单峰”型;夏季和秋季呈“双峰”型,都有明显的光合“午休”现象。夏季龙须藤P_n中午降低主要为非气孔限制,而秋季则主要为气孔限制;龙须藤夏季和秋季节有较高生长势,P_n季节变化趋势为夏季＞秋季＞春季＞冬季;建立了P_n与其影响因子的关系模型,回归方程均达极显著水平(P＜0.01)。统计分析结果显示,在春季,龙须藤P_n主要受气孔导度G_s和胞间CO₂浓度C_i的影响;夏季,P_n受光合有效辐射PAR的影响较明显;秋季时,G_s是P_n主要的影响因子;而冬季则由G_s转为C_i和蒸腾速率T_r的共同作用。

关键词: 龙须藤, 光合作用, 日变化, 季节变化, 影响因子

Abstract: Diurnal changes of net photosynthetic rate (P_n)of Bauhinia championii on Guilin's Karst hills were measured by Li-6400 portable photosynthesis analysis system (LI-6400,Li-cor USA) in different seasons.Itwas found that diurnal curves of P_n were “single peak” in spring and winter,but “double peak” in summer and autumn and they were both with a significant “midday depression of photosynthesis”.P_n reduction at noon in summer was mainly originated from nonstomatal limitation,while it was mainly due to stomatal limitation in autumn;Bauhinia championii showed higher growth potential in summer and autumn,the seasonal changes of P_n were in the order of summer＞autumn＞spring＞winter;The positive relationship models between P_nand its influence factors were all significant (P＜0.01) in different seasons.Statistical analysis indicated that diurnal changes of P_n were affected by stomatal conductance (G_s) and intercellular CO₂ concentration (C_i) in spring,photosynthetic active radiation (PAR) was the main factor influencing P_n in summer,the dominant factor for P_n in autumn was G_s,and P_n in winter was contributed to the the co-effects of C_i andtranspiration rate (T_r).

Key words: Bauhinia championii, photosynthesis, daily change, seasonal change, influential factors

中图分类号:

Q945.1

廖盛厦, 李军伟, 杨红兰, 甘肖梅, 梁士楚. 龙须藤净光合速率日变化及其主要影响因子[J]. 广西师范大学学报（自然科学版）, 2010, 28(3): 61-65.

LIAO Sheng-xia, LI Jun-wei, YANG Hong-lan, GAN Xiao-mei, LIANG Shi-chu. Diurnal Changes of Net Photosynthetic Rate and Influencing Environmental Factors of Bauhinia championii[J]. Journal of Guangxi Normal University(Natural Science Edition), 2010, 28(3): 61-65.

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