摘要
分析了龙爪槐液流相对于气象因子的滞后效应,利用多元线性回归和逐步回归拟合了液流速率,并比较了考虑液流滞后效应前后拟合精度的变化。滞后分析表明,液流相对于太阳总辐射量、风速和光合有效辐射量存在滞后效应,滞后时间分别为10、20、10 min。多元线性回归和逐步回归分析均表明,考虑液流滞后效应的回归方程的决定系数和拟合直线斜率较大,液流速率拟合值与真实值的相对误差波动范围较小。以上分析表明,考虑滞后效应的液流速率拟合精度较高。
The lag effect of sap flow compared to meteorological factors was analyzed,and the multiple linear regression and the stepwise regression methods were applied to fit sap flow velocity,and the change of fitted precision was compared before and after sap flow lag effect considered.The lag effect analysis results showed that the sap flow lag effect existed compared to total solar radiation,wind speed and photosynthesis available radiation,the lag times were 10 min,20 min and 10 min,respectively.The results of multiple linear regression and stepwise regression showed that the determination coefficient and the slop of fitted line were high with sap flow lag effect considered,and the relative error between fitted values and measured values was low.In conclusion,the fitted precision of sap flow velocity with lag effect considered was high.
出处
《广东农业科学》
CAS
CSCD
北大核心
2013年第15期68-71,共4页
Guangdong Agricultural Sciences
基金
国家自然科学基金(41271236)
陕西省教育厅科研计划项目(12JK0814)
渭南师范学院研究生专项科研项目(12YKZ056)
西北农林科技大学旱区农业水土工程教育部重点实验室访问学者项目
关键词
滞后效应
多元线性回归
逐步回归
拟合精度
lag effect
multiple linear regression
stepwise regression
fitted precision
