桉树焦枯病对桉树生长量的损失估计研究

Loss estimation of eucalyptus growth caused by of eucalyptus dieback

按照桉树焦枯病不同发病等级调查桉树各因子生长量,分析不同病级对桉树胸径、树高和材积生长的影响。结果表明,当发病等级达到Ⅳ级时对胸径、Ⅲ级时对树高、Ⅱ级时对材积的生长已经造成极显著影响。根据不同发病等级与损失率的关系进行回归分析,建立了胸径、树高和材积的损失率估测模型,该模型估测结果与调查实测数据相对误差1.32%(精度为98.68%)。以此模型估算福建省桉树人工林焦枯病危害,材积年损失率23.53%,年经济损失0.518亿元。

The effects of different disease grades of eucalyptus dieback on the growth of diameter,height and volume of eucalyptus were analyzed.The result showed that when the disease grades were up to Ⅳ,Ⅲ and Ⅱ,it had significant effects on the growth of diameter,height and volume respectively.According to the relationship between different disease grades and loss rate,the loss rate-estimating models of diameter,height and volume were established with regression analysis.The relative error of the estimation result was 1.32% and the estimation accuracy was 98.68%.In addition,a quantitative estimation of the dieback damage on the eucalyptus plantation in Fujian Province was made with the model,the annual economic loss rate of volume was 23.53%,the annual loss reached $51,800,000.