【摘要】 在研究杨树溃疡病导致幼树生长量损失的过程中,找到一个适用的回归模型。经数学检验,回归曲线形状合理,各项指标均较好。此外,使用此模型能从数学上精确地描述生长量变化的生物学规律,这对生产部门预测病害可能造成的损失,掌握防治指标及估算防治经济效益具有重要意义。更多还原

【Abstract】 A kind of suitable regressive model was found in the research of growth loss of young poplars infected by Dothorella gregraria. Statistical examination showed that the models have higher interrelation between variables, less residuals and better regressive curved lines than many other tested models. Besides, the models can exactly describe biological regularity of growth change. The results are of importance for some production departments to predict the growth and yield loss caused by some plant diseaes, master prevention indices and estimate economic benifits.更多还原