4种芒属植物光合特性研究

doi:10.11733/j.issn.1007-0435.2015.04.013

草地学报 ›› 2015, Vol. 23 ›› Issue (4): 752-757.DOI: 10.11733/j.issn.1007-0435.2015.04.013

4种芒属植物光合特性研究

覃静萍¹, 易自力¹, 肖亮², 黄红梅¹

1. 湖南农业大学生物科学技术学院, 湖南长沙 410128;
2. 生物质醇类燃料湖南省工程实验室, 湖南长沙 410128

收稿日期:2014-09-22 修回日期:2014-12-27 出版日期:2015-08-15 发布日期:2015-08-26
通讯作者: 易自力
作者简介:覃静萍(1978-),女,土家族,湖南常德人,硕士,讲师,研究方向为能源草资源评价与种质筛选,E-mail:qinjingping@aliyun.com
基金资助:
湖南省自然科学基金项目(12JJ2019);湖南省教育厅一般项目(14C0573)资助

Study on Photosynthetic Characteristics of Four Miscanthus Species

QIN Jing-ping¹, YI Zi-li¹, XIAO Liang², HUANG Hong-mei¹

1. College of Science & Technology, Hunan Agriculture University, Changsha, Hunan Province 410128, China;
2. Hunan Engineering Laboratory for Alcohol Fuels from Biomass, Changsha, Hunan Province 410128, China

Received:2014-09-22 Revised:2014-12-27 Online:2015-08-15 Published:2015-08-26

摘要/Abstract

摘要：

以芒(Miscanthus sinensis)、五节芒(M. floridulus)、荻(M. sacchariflorus)和南荻(M. lutarioriparius)等4种典型芒属植物为试验材料,用LI-6400便携式光合仪测量不同时期的光合特性,来研究芒属植物光响应及光合特性的季节性变化规律。结果表明:光合作用参数对不同光合有效辐射的响应在种间有差异,除南荻的光饱和点(LSP)在800 μmol·m^-2·s^-1左右外,其他3种约在1000 μmol·m^-2·s^-1;最大净光合速率(P_nmax)由大到小依次为荻(47.3 μmol·m^-2·s^-1)、南荻(38.6 μmol·m^-2·s^-1)、五节芒(20.4 μmol·m^-2·s^-1)、芒(8.0 μmol·m^-2·s^-1);表观量子效率(AQY)依次为荻(0.123)、南荻(0.108)、五节芒(0.089)、芒(0.022),荻和南荻的光能转化率强于五节芒和芒。主生长季的净光合速率(P_n)表现出明显的季节性变化,并与生长速率同步,种间差异极显著(P< 0.01),荻和南荻的P_n值高于芒和五节芒。 4种芒属植物在主生长季的水分利用率(WUE)最小值在6-7月,最大值在8-9月,表现出耐旱耐高温能力,且种间差异显著(P< 0.05)。

关键词: 芒属植物, 光响应, 净光合速率, 水分利用率

Abstract:

To understand the differences of photosynthetic characteristics between interspecies and to clarify the features of adaption to ecological environment, the light response characteristics and seasonal changes of four Miscanthus species were tested using Li-6400 photosynthetic apparatus. The test results showed that the responses of photosynthetic parameters to photosynthetic active radiation were different among four species. The light saturation point (LSP) of M. lutarioriparius was about 800 μmol·m^-2·s^-1 and the others were about 1000 μmol·m^-2·s^-1. The P_nmax of tesates species were ordered as M. sacchariflorus (47.3 μmol·m^-2·s^-1) >M. lutarioriparius (38.6 tari·m^-2·s^-1) >M. floridulus (20.4 μmol·m^-2·s^-1) >M. sinensis (8.0 μmol·m^-2·s^-1). The order of AQY were M. sacchariflorus(0.123) >M. lutarioriparius (0.108)>M. floridulus (0.089)>M. sinensis (0.022). The light energy conversion rates of M. sacchariflorus and M. lutarioriparius were higher than that of M. floridulus and M. sinensis. The P_n values in main growing season showed that the growth rate was synchronous with seasonal change. There were extremely significant differences (P< 0.01) among different species, the P_n values of M. sacchariflorus and M. lutarioriparius were significantly higher than that of M. sinensis and M. floridulus. The water use efficiency (WUE) of plant in main growing season significantly differed among interspecies (P< 0.05). The minimum of WUE appeared from June to July and the maximum appeared from September to October. The tested species had the abilities of high temperature resistant and drought tolerance.

Key words: Miscanthus, Light-response, Net photosynthetic rate, Water use efficiency

中图分类号:

Q945.11

覃静萍, 易自力, 肖亮, 黄红梅. 4种芒属植物光合特性研究[J]. 草地学报, 2015, 23(4): 752-757.

QIN Jing-ping, YI Zi-li, XIAO Liang, HUANG Hong-mei. Study on Photosynthetic Characteristics of Four Miscanthus Species[J]. Acta Agrestia Sinica, 2015, 23(4): 752-757.

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4种芒属植物光合特性研究

Study on Photosynthetic Characteristics of Four Miscanthus Species

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