基于日照时数的光合有效辐射估算方法研究

Study on estimation method of photosynthetic effective radiation based on sunshine hours

区域日序、时序光合有效辐射的准确估算是揭示区域农林产量、品质形成机理不可或缺的数据源。基于广西武鸣2018年10月1日至2020年3月31日地表太阳总辐射、光合有效辐射等观测数据,统计分析了日序及其各时次地表太阳总辐射、光合有效辐射曝辐量与其对应的日照的变化关系。结果表明,日序及其各时次的晴空指数与其对应的日照百分率呈现二阶函数变化,而日序及其各时次的光合有效系数与其对应的晴空指数的自然对数呈现良好的线性变化关系,尤以农作物、林果等主要生长季的4—11月期间效果最佳。由此而构建的基于日照时数的日序及其时次光合有效辐射估算模型,对弥补农林产量、品质构成的光合作用影响机理研究等所需的基础数据源有非常重要意义。

The accurate estimation of regional diurnal and temporal photosynthetic effective radiation is an indispensable data source to reveal regional agricultural and forestry yield and quality formation mechanism.Based on the observation data of surface total solar radiation and photosynthetic effective radiation in Wuming,Guangxi from October 1, 2018 to March 31, 2020, this paper statistically analyzed the variation relationship between the daily sequence and the surface total solar radiation as well as photosynthetic effective radiation exposure at each time and their corresponding sunshine. The results show that the day sequence and the clear sky index of each time and its corresponding sunshine percentage show a second-order function change. The photosynthetic effective coefficient of the day sequence as well as its respective time periods and the corresponding natural logarithm of the clear sky index show a good linear relationship, especially from April to November during the main growing seasons of crops and forest fruits. The estimation model of daily sequence and time photosynthetic effective radiation based on sunshine hours is of great significance to make up for the basic data source needed for the study of photosynthesis influence mechanism of agricultural and forestry yield and quality composition.