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采用开顶式气室(OTC)控制模拟环境,研究了二氧化碳(CO2)浓度升高对龙血树和春羽叶片光合生理及叶绿素荧光参数的影响。结果表明:(1)随着CO2浓度增加,龙血树和春羽幼苗叶面积和株高均呈显著增加趋势。(2)龙血树和春羽幼苗叶片净光合速率随着CO2浓度的升高均呈先增加后降低的趋势,而同期蒸腾速率和气孔导度显著降低。(3)随着CO2浓度的增加,龙血树和春羽幼苗叶片最大光量子产量、实际光能转化效率均呈先升后降的趋势,而同期非光化学猝灭系数呈先降低后升高的趋势;光化学猝灭系数总体上也呈先升高后降低的趋势,但差异不显著。研究表明,一定时间的高浓度CO2处理提高了龙血树和春羽的净光合速率,促进了植物的生长,但随着处理时间的延长,这种促进作用逐渐降低进而消失,并以春羽幼苗表现得更突出;即高浓度CO2可能破坏了龙血树及春羽生长后期光系统Ⅱ反应中心结构,导致叶片光合能力降低。
The open environment chamber (OTC) was used to control the simulated environment. The effects of carbon dioxide (CO2) concentration on photosynthetic physiology and chlorophyll fluorescence parameters in leaves of Dracaena selengensis and spring plume were studied. The results showed that: (1) With the increase of CO2 concentration, leaf area and plant height of Draca sylvestris var. (2) The net photosynthetic rate of the leaves of Dracaena selengensis and P. chinensis increased first and then decreased with the increase of CO2 concentration, while the transpiration rate and stomatal conductance decreased significantly at the same time. (3) With the increase of CO2 concentration, the maximum photochemical quantum yield and the actual light energy conversion efficiency of the leaves of Draca sylva and Anemarrhena asphodeloides tended to increase first and then decrease, while the non-photochemical quenching coefficient of the two plants decreased first and then increased Trend; the coefficient of photochemical quenching also showed a trend of first increasing and then decreasing, but the difference was not significant. The results showed that high CO2 concentration at a certain time increased the net photosynthetic rate and promoted the growth of plants. However, with the prolongation of treatment time, the promotion effect decreased and then disappeared. The seedlings showed more prominent; that is, the high concentration of CO2 could damage the structure of the reaction center of photosystem Ⅱ in the late growth stage of Dracaena selengensis and spring plum, leading to the decrease of photosynthetic capacity of leaves.