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对叶片尺度上的气孔导度-光合-蒸腾耦合模型(SMPT-SB)在冠层尺度上进行了扩展,探讨了模型的参数化方法,建立了冠层尺度上的生态系统光合-蒸腾耦合模型.并用中国通量观测网络(ChinaFLUX)长白山站的涡度相关观测数据对模型进行了验证.结果表明,冠层气孔内部导度gic可以通过单叶气孔内部导度与光合有效辐射的关系,通过模拟冠层内的光分布再对冠层进行积分实现由单叶向冠层的尺度转换.在无水分胁迫情况下,该模型在冠层尺度上对光合速率具有很高的模拟能力,模拟值与观测值的直线回归方程斜率为0.7977,R2=0.8892(n=752),平均绝对误差为3.78μmolCO2·m?2·s?1;蒸腾速率的模拟值和观测值直线回归方程的斜率为0.7314,R2=0.4355(n=752),平均绝对误差为1.60mmolH2O·m?2·s?1.同时分析结果表明,降水过程是影响蒸腾速率模拟效果的最直接原因.本模型将冠层作为一个整体,而忽略了冠层内部复杂的反馈机制,探讨了整个冠层光合和蒸腾与外部环境条件之间的关系,与传统的基于植物生理生态学过程模型,相比本模型简单且易于求解,便于应用.可以将其作为构建土壤-植被-大气连续体水碳耦合模型的基础模型.
The stomatal conductance-photosynthesis-transpiration coupling model (SMPT-SB) at the blade scale was extended on the canopy scale. The parameterization method of the model was discussed and the photosynthesis-transpiration coupling model of the ecosystem at the canopy scale The model was verified by using the vorticity correlation data from ChinaFLUX Changbai Mountain Station.The results showed that the internal conductivity of canopy stomata gic can be controlled by the relationship between internal conductivity of photosynthetic stomatal and photosynthetic active radiation The light distribution in the canopy was simulated and then the canopy was converted to the canopy scale conversion from single leaf to canopy.Under the condition of no water stress, the model had a very high ability to simulate the photosynthetic rate at the canopy scale, The slope of the linear regression equation with the observed value was 0.7977, R2 = 0.8892 (n = 752), the average absolute error was 3.78μmolCO2 · m-2 · s-1. The slope of the linear regression equation between the simulated and observed transpiration rate was 0.7314 , R2 = 0.4355 (n = 752), the average absolute error was 1.60mmolH2O · m-2 · s · 1.At the same time, the results showed that the precipitation process was the most direct reason to influence the simulation of transpiration rate.This model used the canopy as one Overall, while ignoring it This paper discusses the complex feedback mechanism inside the layer and discusses the relationship between the whole canopy photosynthesis and transpiration and the external environmental conditions. Compared with the traditional process model based on plant physiology and ecology, this model is simple and easy to solve and easy to apply. As a basic model for building a water-carbon coupling model for soil-vegetation-atmosphere continuum.