【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 )e-bx更多还原

【Abstract】 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 .更多还原