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草业学报 ›› 2009, Vol. 18 ›› Issue (6): 254-258.

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黑籽雀稗的光合生理特性研究

刘金祥,陈伟云,肖生鸿   

  1. 湛江师范学院热带草业科学研究所,广东 湛江 524048
  • 收稿日期:2008-09-16 出版日期:2009-12-20 发布日期:2009-12-20
  • 作者简介:刘金祥(1964-),男,陕西凤翔人,教授,博士。E-mail:lightlong@163.com

A study on the photosynthetic characteristics of Paspalum atratum

LIU Jin-xiang, CHEN Wei-yun, XIAO Sheng-hong   

  1. Tropical Institute of Grassland Science, Zhanjiang Normal University, Zhanjiang 524048, China
  • Received:2008-09-16 Online:2009-12-20 Published:2009-12-20

摘要: 利用Li-6400便携式光合分析仪测定黑籽雀稗的光合特性。结果表明,黑籽雀稗的光合日变化呈双峰型,有明显的“午休”现象。11:00左右出现第1个峰值(Pn为28.8 μmol/m2·s),15:00左右出现第2个峰值(Pn为21.59 μmol/m2·s),变化趋势与气孔导度(Gs)、蒸腾速率(Tr)等因子相同。黑籽雀稗叶片的光饱和点(LSP)为1 700 μmol/(m2·s),光补偿点(LCP)20 μmol/(m2·s),表观光量子效率(AQY)0.073 9 mol/mol,CO2饱和点(CSP)600.01 μmol/mol,CO2补偿点(CCP)21.89 μmol/mol,羧化效率(CE)0.084 6 μmol/(m2·s)。

Abstract: Paspalum atratum is a perennial forage grass. This field study investigated the photosynthetic characteristics of P. atratum. Gas exchange was measured using a LI-6400 portable photosynthesis system on clear days in May. The photosynthesis showed a double-peak with a considerable noon inhibition, and belonged to the stomatal limitation type. The first peak appeared at about 11:30 a.m. when Pn reached 28.8 μmol/(m2·s) while the second peak appeared at about 15:00 when Pn was 21.59 μmol/(m2·s). The change was positively related to variations of Gs and Tr. The light saturation and compensation points, and apparent quantum yield of P. atratum were about 1 700 and 20 μmol/(m2·s), and 0.073 9 mol/mol, respectively. The CO2 saturation and compensation points, carboxylation efficiency were 600.01 and 21.89 μmol/mol, and 0.084 6 μmol/(m2·s), respectively.

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