Growth and Productivity of Castanopsis fargesii Stands

To determine the growth process and productivity of Castanopsis fargesii Franch stands,9 average trees were sampled and analyses of tree growth process were done based on a stand investigation in 10 sample plots in C. fargesii stands and 2 sample plots in Chinese fir stand,in Hongdeng Forest Farm of Shaowu,Fujian Province.The results showed that:the total increments of DBH,tree height and individual volume of trees increased as age of trees went up; DBH increased fast before 20 years old;the growth of tree height were fast before 16 years old;and no decline evidence of timber increment occurred until age of 36 in the stand.Before the climax of DBH increment and of mean increment of height occurred,their increment went up as age of trees increased;but declined after the climax.The increment climax of DBH occurred at age of 12 and 15 in high quality site and low middle quality site respectively;the increment climax of height occurred at age of 10,8 and 12 in high,middle and low quality site,respectively.The average increment of timber volume went up as tree age rose until the age of 36 in high and low quality site;moreover,its climax emerged at the age of 34 in a middle quality site.The yearly increment of DBH and height fell down as the age went up.Yearly volume of timber increased as the age went up before the increment climax emerged;but declined after the climax,in which its increment climax of timber volume occurred at age of 28,22 and 26 respectively.Besides,the total timber volume of C. fargesii stands was lower than that in Chinese fir stands in similar site,but the biomass of tree layer was higher than that in Chinese fir stands.