• 中文核心期刊
  • CSCD来源期刊
  • 中国科技核心期刊
  • CA、CABI、ZR收录期刊

基于单色光的植物光合响应曲线及其模型研究

Light Response Curves and Photosynthesis Models on Plants Exposed to Monochromatic Lights

  • 摘要:
      目的  研究不同植物幼苗在多种单色光条件下的光合响应曲线及其数学模型,为植物工厂作物栽培架等现代农业种植设施的研发提供理论依据。
      方法  应用植物特征光谱试验方法及其测试系统,获取10种植物幼苗的22种单色光的光合响应曲线;选择红椎与马褂木两个具有代表性的植物,得出对应单色光光合响应曲线的数学模型;根据渐近线型单色光植物光合响应曲线的特点提出准饱和点光强的概念及计算方法,再依据所测定的植物幼苗22种单色光的饱和点光强,比较理论计算值与实际测定值的偏差程度,并以此为基础绘制植物光合作用饱和点曲线。
      结果  植物幼苗的光合响应曲线可分为两类,以红椎为代表的一类植物光合响应曲线呈渐近线型,这类曲线没有极值;以马褂木为代表的一类植物光合响应曲线则有拐点,这类曲线有极值。模型计算得到的准饱和点光强与实际测定的饱和点光强具有较高的拟合度,经过对数据的综合处理,获得对应的饱和点曲线和补偿点曲线。
      结论  采用植物特征光谱试验方法及其测试系统可以得到植物在单色光条件下的光合响应曲线,揭示了不同植物光合作用的规律及特点。由此提出的植物光合响应数学模型与实测值具有较高拟合度,可作为研究分析植物光合作用现象的重要参考。

     

    Abstract:
      Objective  Mathematical models of the photosynthetic responses of plants exposed to monochromatic lights were constructed for the development of indoor agricultural cultivation.
      Method   An experimentation was designed to generate varied wavelengths of monochromatic lights and test, measure, and construct a mathematical model for the photosynthetic responses of plants exposed to the light source. On seedlings of 10 different plant species grown under 22 varied monochromatic lights, the photosynthetic rates of the plants were measured to obtain light response curves (LRCs). Using Castanopsis hystrix and Liriodendron chinense (Hemsl.) Sarg as two representative plants, mathematical models were constructed. From the asymptotic linear curve, the light intensity at quasi-saturation point was calculated. Then, the calculated theoretical and measured empirical data were compared to test the validity of the prediction model.
      Result  Of all the LRCs, there were two types—one of C. hystrix, which was asymptotic linear showing no plateau, and another of L. chinense, which had an inflection point. A high degree of fitting was found between the light intensity at quasi-saturation point calculated from the model and that measured empirically. After a data treatment, curves with light saturation and compensation points were obtained.
      Conclusion  The specially designed monochromatic lights generating method and plant photosynthesis measuring system enabled a successful construction of the LRCs. The patterns and characteristics of the photosynthesis of different plants in response to the monochromatic lights varied. The high fitting on the photosynthetic response data between the values calculated from the mathematical model and those measured from the experiment suggested an applicability of the current methodology for studies on plant photosynthesis. Since the developed method and test system were not species-specific, they could be used universally for research on other plants. And using the mathematical model, optimal light wavelength and intensity at saturation point could be estimated for designing artificially controlled agriculture facilities such as “plant factories” for indoor mass crop cultivation.

     

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