Research on Light Use Efficiency of Rice Based on Eddy Covariance Method

doi:10.13304/j.nykjdb.2021.0827

Abstract

Abstract:

In order to explore the dynamic characteristics of light use efficiency （LUE） during the growing season of rice， the flux observation data of rice field from May to September in 2020 was studied. The effects of environmental factors on LUE were analyzed by applying simple correlation analysis and path analysis methods. The results showed that the fluctuation range of LUE was from 0.25% to 2.23% with the average value 0.95%. And LUE at hour scale showed higher values in the morning and evening， and lower values at noon， which daily dynamics showed a single-peak curve change of firstly increasing and then decreasing. LUE in daily scale was mainly influenced by photosynthetic effective radiation and air temperature， which provided theoretical basis for rationally utilizing farmland ecosystem resources and promoting the application of LUE in productivity model.

Key words: rice, light use efficiency, eddy covariance method

摘要：

为探讨水稻生长季内光能利用率（light use efficiency，LUE）的动态特征，使用2020年5—9月稻田通量观测资料，应用简单相关分析和通径分析方法，分析环境因子对光能利用率的影响。结果表明，水稻生长季LUE日平均值为0.95%，波动范围为0.25%~2.23%，小时尺度表现为早晚值较高、中午值较低，日动态上呈现先升高后降低的单峰曲线变化；日尺度上的LUE主要受光合有效辐射和空气温度影响。研究为合理利用农田生态系统资源、推动LUE在生产力模型中的应用提供了理论依据。

关键词: 水稻, 光能利用率, 涡度相关法

CLC Number:

S511

Shuangya WEN, Nan SHI, Chongyi CHEN, Haiyan HU, Zhiqiang GAO. Research on Light Use Efficiency of Rice Based on Eddy Covariance Method[J]. Journal of Agricultural Science and Technology, 2022, 24(7): 159-166.

文双雅, 石楠, 陈崇怡, 胡海燕, 高志强. 基于涡度相关法的水稻光能利用率研究[J]. 中国农业科技导报, 2022, 24(7): 159-166.

Figures/Tables 6

Fig.1 Diurnal variation of environmental factors

Fig.2 Hourly dynamic changes of LUE

Fig.3 Daily dynamic changes of LUE

Fig.4 Correlation analysis between LUE and environmental factorsNote： Scatter diagrams are below the diagonal line； correlation coefficients are above the diagonal line； data are in the diagonal line； *， ** and *** indicate significant correlations at P<0.05， P<0.01 and P<0.001 levels， respectively.

Table 1 Normality test

指标

Index

Kolmogorov-Smirnov（V）

Shapiro-Wilk

D 统计量

D statistics

自由度

Freedom

P值

P value

W 统计量

W statistics

自由度

Freedom

P值

P value

Table 2 Path analysis of environmental factors and LUE

环境因子

Environmental factor

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