【摘要】 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。更多还原

【Abstract】 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_0.7are 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.更多还原