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作 者:张永霞[1] 李国旗[2] 闫伟兄[3] 谢亚军[1] 朱莉[1] 万海霞[1] 张浩[1]
机构地区:[1]宁夏大学生命科学学院,宁夏银川750021 [2]宁夏大学西北退化生态系统恢复与重建省部共建教育部重点实验室,宁夏银川750021 [3]内蒙古生态与农业气象中心,内蒙古呼和浩特010051
出 处:《干旱地区农业研究》2008年第2期102-105,共4页Agricultural Research in the Arid Areas
基 金:教育部新世纪优秀人才支持计划(NCET-05-0896);国家林业局“948”项目(2004-04-10)
摘 要:用CIRAS-1便携式光合测定仪分别测定红麻和白麻的光合参数。结果表明:红麻和白麻的光合日变化均为典型双峰曲线,主峰值出现在上午10∶00左右,次峰出现在下午14∶00,具有明显的光合"午休"现象。红麻和白麻的净光合速率(Pn)随光合有效辐射(PAR)的增加而迅速升高,光补偿点(LCP)分别为84.9μmol/(m2.s)和85.8μmol/(m2.s),光饱和点(LSP)分别为1 860μmol/(m2.s)和1 618μmol/(m2.s)。红麻和白麻CO2补偿点分别为74.8μmol/mol和49.3μmol/mol;CO2饱和点分别为1 597μmol/mol和1 737μmol/mol,这表明白麻对高浓度的CO2适应能力和利用能力比红麻强。The photosynthetic parameters of dogbane(including Apocynum venetum L and Poacynurn picture Baill)were measured with CIRAS- 1 portable photosynthesis system in the sunshine days of September, The results showed that the diurnal change of photosynthesis rate( Pn )of dogbane displays a double-peak manner thus suffering a noon inhibition. Their first peak occurred at 10:00 AM while the second peak appeared at 14:00 PM, The net photosynthetic rate(Pn ) of dogbane increases rapidly with the rising of Photosynthetic Active Radiation(PAR). The light compensation point (LCP) of A. Venetum and P, picture are 84.9 μmol/(m^2 · s) and 85.8 μmol/(m^2·s) respectively for mature leaves, and the light saturation point(LSP) is 1 860 μmol/ (m^2·s) and 1 618 μmol/(m^2·s) respectively. The CO2 compensation point (CCP) of A. Venetum and P. picture is 74,8 and 49,3 μmol/(m^2·s), respectively, and the CO2 saturation point(CSP) are 1 597 μmol/(m^2·s), and 1 737 μmol/(m^2·s) , which demonstrates that P, picture is adapted to higher CO2 concentration than A. Venetum.
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