槲蕨的光合特性与环境因子的关系

目的:探索不同光照环境下槲蕨的光合作用日变化,为槲蕨的人工栽培提供理论依据。方法:利用Li-6400便携式光合测定系统测定槲蕨的光合作用日变化,并对影响其光合作用的生理因子和环境因子进行相关性分析。结果:槲蕨的净光合速率日变化呈单峰曲线,最大值出现在15∶30,日均净光合速率以树附生环境的槲蕨最高,其次是阳生环境,阴生环境的最低,对光环境的适应性较强;瞬时水分利用率与净光合速率呈极显著正相关,大气温度、CO2浓度和相对湿度是槲蕨净光合速率的主要环境影响因子。结论:人工栽培时以控制气温为32℃左右,空气相对湿度40%左右,适当遮荫最适宜。

Photosynthetic characteristics of Drynaria fortunei and its relation to environmental factors

Objective: To have a better utilization of diurnal photosynthetic variation of Drynaria fortunei in three light environments and provide theoretical basis for its artificial cultivation.Methods: Diurnal photosynthetic variation of Drynaria fortunei were determinated by portable photosynthesis analysis system(Li-6400),and correlation between physiological and environmental factors was further analysed.Results: The diurnal net photosynthetic rate(NPR) exhibited a single peak curve,with the peak value of NPR occurring at 15∶30.The mean diurnal Pn of D.fortunei in three environments followed a tread of tree epiphytes > shine >shade.WUE had significantly positive correlation with NPR.Air temperature(Ta),ambient CO2 concentration(Ca) and relative humidity(RH) were the main environmental factors for NPR of D.fortunei.Conclusion: The optimum cultivation condition of D.fortunei is 32 ℃,RH around 40 %,and appropriate shade is recommended.