青钱柳光合作用日变化和光合响应特征

柏明娥; 方建华; 徐高福; 沈建军; 陈秀娟

青钱柳光合作用日变化和光合响应特征

Diurnal Variation of Photosynthetic Parameters and Response Character of Cyclocarya paliurus Seedlings

摘要

摘要: 以一年生青钱柳（Cyclocarya paliurus）播种苗为试材，对其叶片的净光合速率（Pn）、蒸腾速率（Tr）、气孔导度（Gs）、胞间CO2浓度（Ci）等光合生理指标的日变化及光响应曲线进行测定，分析了光合参数间的相关性。结果表明：青钱柳苗Pn、Tr、Gs的日变化均为“双峰”曲线，两个峰值分别出现在9:30和13:00，Ci的日变化表现为早晚高、中午低，低谷出现在11:30；Pn与Gs呈极显著相关（P < 0.01），与Tr呈显著相关（P < 0.05），与其它参数间的相关性不显著；光补偿点为14.63 ?mol/(m2?s)，光饱和点为1 200 ?mol/(m2?s)，最大净光合速率为8.32 ?mol/(m2?s)；影响青钱柳光合生理参数的主要环境因子为光合有效辐射和大气温度（Ta）。

Abstract: Determinations were conducted on net photosynthetic rate(Pn), transpiration rate(Tr) stomatal conductance(Gs), intercellular CO2 concentration(Ci), and response of 1-year Cyclocarya paliurus seedlings. The result showed that diurnal variation of Pn, Tr, Gs had double peaks occurred at 9:30 and 13:00, while that of Ci topped in the morning and evening, the lowest at 11:30. Pn had extremely significant correlation with Gs (P < 0.01), significant correlation with Tr (P < 0.05). Light compensate point (LCP) was 14.63?mol/(m2?s), light saturation point (LSP) was 1 200?mol/(m2?s), maximum net photosynthetic rate (Pnmax) was 8.32 ?mol/(m2?s). The experiment demonstrated that photosynthetically available radiation (PAR) and atmospheric temperature (Ta) had effect on photosynthetic parameters of tested seedlings.

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