Preliminary study on growth process, quantitative maturity and technical maturity of Castanopsis fissa

Through analyzing the tree stem data of 27-year-old Castanopsis fissa standard trees, the growth processes of DBH, tree height, timber volume growth and timber volume growth rate, tree form factors in each age grade were investigated and analyzed. The results show that in the first 10 years, C. fissa trees were on fast-growing trend, the successive year diameter peaks occurred in the 5th year and the successive year tree height peaks appeared in the 20th year; After 20 years, the successive year tree height increment began to decline, the average annual increment curve and successive year increment curve of 18-year-old and 25-year-old tree diameter and tree height intersected each other at two points; C. fissa stem wood growth rate rose with the increase of tree age, the maximum increasing rate of volume increment reached 40%, the minimum 8%; the tree form factors first rose then deduced with the increase of tree age, later stabilized at o.51; the quantitative maturity age of C. fissa was the 25th, this moment the peak value appeared at 0.0258 m3, but when the tree growth time came to 27th years, the trees didn't reached the technical maturity age.