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目的:探讨红根草的光合特性,为红根草高产栽培管理提供理论依据。方法:用Li-6400便携式光合测定系统对红根草的光合-光强响应曲线和光合日变化进行了测定。结果:红根草叶片的最大净光合速率为15.10μmoL/m2.s,表观量子效率为0.0441μmoL/μmoL,暗呼吸速率为0.7394μmoL/m2.s,光饱和点为1225.02μmoL/m2.s,光补偿点为17.81μmoL/m2.s。红根草的净光合速率(Pn)日进程呈“双峰型”曲线,偏相关分析表明,Pn与光合有效辐射、气孔导度、胞间CO2浓度、叶面大气蒸气压亏缺呈极显著相关,光合“午休”的主要原因是强光引起的非气孔因素。结论:红根草为光强范围适应较广的阳生草本植物,但夏季适度遮荫利于其生长。
OBJECTIVE: To investigate the photosynthetic characteristics of red grass and provide a theoretical basis for high-yielding cultivation and management of red grass. Methods: The photosynthesis-light response curve and photosynthetic diurnal variation of red grass were determined by Li-6400 portable photosynthesis system. Results: The maximum net photosynthetic rate of A. canadensis leaves was 15.10μmoL / m2.s, the apparent quantum yield was 0.0441μmoL / μmoL, the dark respiration rate was 0.7394μmoL / m2.s, the light saturation point was 1225.02μmoL / m2.s , Light compensation point of 17.81μmoL / m2.s. The daily mean of photosynthetic rate (Pn) of red grass was “bimodal” curve. Partial correlation analysis showed that Pn and photosynthetically active radiation, stomatal conductance, intercellular CO2 concentration, leaf vapor pressure deficit Significantly related to photosynthesis “lunch break ” is mainly due to non-stomatal factors caused by glare. Conclusion: The red grass for the light intensity range to adapt to a wide range of yangsheng herbaceous plants, but summer moderate shade conducive to its growth.