天然长白松干形的研究

长白松是我国特有的松科松属植物,仅见于长白山海拔630~1 400 m之间,因其特殊的分类地位和优良的遗传性而受到普遍关注。本文对第一代天然长白松林的干形进行了分析研究,结果表明:正形数的变动系数最小,相对比较稳定;从正形率系列看,q0.7以下的变动系数均小于10%,随着直径上移,变动系数增大;形数随形率增大而增加,且相关关系紧密;利用样条函数理论,拟合出长白松干形曲线的样条函数方程组,利用计算机程序可容易地计算出立木材积,与实测值相比较80%样木的误差小于3%,精度较高。海拔700 m处的长白松立木干形优于海拔1 100 m处的干形,尖削度小,干形圆满,出材率高。

Study on the stem form of natural Pinus sylvestris var.sylvestriformis

The research on the stem form of natural Pinus sylvestris var.sylvestriformis shows that variable coefficient of normal form factor is the least and steady relatively;from the series of normal form quotient,all variable coefficients below q_(0.7)are less than 10%,and the variable coefficients have increased with diameter grows upwards;normal form factor has a close relation to normal form quotient and the former increases along with the later;the error of standing volume calculated by computer procedure is less than 3% compared with actual volume.Result of the research reveals that standing stem form of Pinus sylvestris var.sylvestriformis at an altitude of 700 meters is better than at 1 100 meters,and also have the characteristics of a small taper,full-bodied and high out-put.