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目的:了解草珊瑚光合特性,为草珊瑚科学栽培提供理论依据。方法:采用LI-6400便携式光合仪,对种植在浙江林学院药用植物种质资源圃内采自20个全国主产区草珊瑚种源的植株光合特性进行系统测定与比较。结果:草珊瑚的光饱和点均在800μmol.m-2.s-1左右,光补偿点在14.70~48.68μmol.m-2.s-1;各不同种源草珊瑚的净光合速率日变化均呈“双峰”曲线,上下午各有一高峰,在11:00-13:00净光合速率显著降低,出现光合“午休”现象。实验结果表明,影响净光合速率日变化主要因子有胞间二氧化碳浓度(Ci),二氧化碳浓度(CO2S)和蒸腾速率(Tr),其与净光合速率之间的相关系数均值分别为-0.89(P<0.01),-0.75(P<0.05),0.69(P<0.05)。结论:草珊瑚具有良好的耐荫性,通过遮荫和洒水以降低小环境温度,提高湿度,可减少“午休”现象出现的时间,提高光合效率。
Objective: To understand the photosynthetic characteristics of grass coral and provide theoretical basis for the scientific cultivation of grass coral. Methods: LI-6400 portable photosynthesis system was used to measure and compare the photosynthetic characteristics of the plants collected from the provenances of 20 coral genus in the main producing areas of Zhejiang Forestry College germplasm resource garden. Results: The photosynthetic rate of A. sinensis was about 800μmol.m-2.s-1 and the light compensation point was 14.70-48.68μmol.m-2.s-1. The diurnal changes of net photosynthetic rate All showed “double peak” curve, with a peak in the morning and afternoon, a significant decrease in net photosynthetic rate at 11: 00-13: 00, and a phenomenon of photosynthesis “lunch break ”. The results showed that the main factors influencing diurnal variation of net photosynthetic rate were intercellular carbon dioxide concentration (Ci), carbon dioxide concentration (CO2S) and transpiration rate (Tr), and their correlation coefficients with net photosynthetic rate were -0.89 (P <0.01), -0.75 (P <0.05), 0.69 (P <0.05). Conclusion: The grass coral has good shading tolerance. Through shading and sprinkling to reduce the temperature of small environment and increase the humidity, the time of “lunch break” can be reduced and photosynthetic efficiency can be improved.