Effect of Different Thinning Intensity on the Growth of Cunninghamia lanceolata

In this paper,the influences of different thinning intensity on the growth of Cunninghamia lanceolata plantations were investigated in Taoyuan National Forest Farm,Fujian province.The results indicated that the net growth of plant height,diameter at breast height(DBH) and individual volume was increased by 5.7%～37.1%,12.5%～112.5% and 15.0%～129.8% respectively in C.lanceolata plantation treated by different thinning intensity of 30%,45%,60% compared with the control plantation after thinning of six years.Obviously,the plant height,diameter at breast height,individual volume of the plantation with thinning intensity of 60% were increased most significantly among them.However,with the increase of thinning intensity,the stand total volumes had a little decrease.On the basis of these,some suggestions were put forward to big,medium,small diameter timber of C.lanceolata,including thinning number and time,and the cultivation period.