摘要
二次抛物线模型曾广泛应用于养分效应的研究 ,然而这种对称模型与多数情况不符。提出了一个能反应养分效应普遍现象且在拟合度与生物学意义上较二次抛物线模型均优越的非对称改进模型。y =(a0 +a1x +a2 x2 )
The quadratic parabola model was once widely used to study the effects of nutrients.Such a symmetric model,however,does not accord with the practical situation in most cases.Based on an asymmetric model,which seems to be superior to the quadratic parabola model in fitting degree and biological significance,a modified asymmetric model is proposed:y=(a 0+a 1x=a 2x 2)e -bx .
出处
《西南农业大学学报（自然科学版）》
CSCD
北大核心
2001年第1期91-92,共2页
Journal of Southwest Agricultural University
关键词
数据模型
养分效应
残差平方和
生物
mathematical model
nutrient effect
remainder square sum
