黧蒴栲生长过程及数量成熟、工艺成熟的初步研究

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

通过对27年生黧蒴栲标准木的树干解析,分析黧蒴栲在每个龄阶的胸径、树高、材积的生长量和材积生长率、形数生长变化情况及生长过程。结果表明:黧蒴栲在前10年表现出速生生长的趋势,直径连年高峰值出现在第5年,树高连年高峰值出现在第20年;20年以后树高的连年生长量开始下降,第18年和第25年直径和树高分别出现平均生长量与连年生长量相现象;黧蒴栲材积生长率随年龄的增加而减小,最大值达到40%,最小值为8%;形数变化随年龄的增长呈先下降后上升再下降的现象,后稳定在0.51左右。黧蒴栲数量成熟龄为25年,此时连年生长量出现高峰值0.025 8 m3,但直到27年时暂未到达工艺成熟龄。

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 0.51; 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.