福建华安马尾松生长早晚期相关及早期选择

<正>本研究证明马尾松不同林分个体的高生长变异随年龄的增长而增大,而径生长变异在达到某一高峰后有所下降。生长变异增长率和相关系数增长率均在9年或10年时最高。初步确认10年生是该地区马尾松天然林早期选择的“最佳年龄”,并可用10年生时的树高、胸径平方分别对30年时的材积进行早期预估。人工林早期选择的“最佳年龄”比天然林提早一年。

EARLY-LATE CORRELATION AND EARLY SELECTION OF THE GROWTH TRAITS OF PINUS MASSONIANA LAMB. IN HUAAN COUNTY, FUJIAN PROVINCE

The early-late correlation and early selection of the growth traits of Pinus massoniana were studied through stem-analysis of the dominant or codominant trees in four masson pine stands on Xipi Forest Farm in Huaan county, Fujian province. The result showed that the variation of height growth increases with age, but the variation of ameter growth declines a little after the maximum. Both the rate of increase growth variation and that of correlation coefficient reach their maximum at t age of 9 or 10. Through analysis of the growth variation, its correlation and the early selection efficiency, it is primarily decided that the age of 10 is the best age for the early selection of the natural stands of masson pine. According to the height and the square of the breast height diameter of the masson pine at the age of 10, the volume at the age of 30 could be estimated. The best age for the early selection earried out in a plantation in one year earlier than that in a natural stand.