据加拿大Carnation Creek生态试验站20a的森林水文观测资料,应用回归分析和协方差检验,研究了森林砍伐以前、道路修筑、砍伐中和砍伐后各时期洪水参数的变化,统计结果表明,森林砍伐后,洪峰和洪量有显著的增大,一般增幅在20％～30％之间,年径流量增长15％～20％,但洪峰滞时和洪水形态变化不大。 According to the forest hydrological data of Carnation Creek Ecological Experimental Station 20a in Canada, regression analysis and covariance test were used to study the changes of flood parameters before and after deforestation, road construction, deforestation and post-harvesting. The statistical results show that after deforestation , Flood peak and flood volume increased significantly, the general increase ranged from 20% to 30%, annual runoff increased from 15% to 20%, but the flood peak lag and flood morphology did not change much.