欢迎访问林业科学,今天是

林业科学 ›› 2007, Vol. 43 ›› Issue (12): 16-21.doi: 10.11707/j.1001-7488.20071203

• 论文及研究报告 • 上一篇    下一篇

樟子松人工林的节子寿命及年轮丢失数

卢军 李凤日   

  1. 东北林业大学,哈尔滨150040
  • 收稿日期:2007-07-19 修回日期:1900-01-01 出版日期:2007-12-25 发布日期:2007-12-25

Long and Missing Ring of Knots in Pinus sylvertris var.mongolica Plantation

Lu Jun,Li Fengri   

  1. Northeast Forestry University Harbin 150040
  • Received:2007-07-19 Revised:1900-01-01 Online:2007-12-25 Published:2007-12-25

摘要:

分析黑龙江省横头山林场和孟家岗林场14块标准地的樟子松人工林节子寿命、可测年轮和丢失年轮的数量及其变化规律。结果表明:樟子松人工林节子的寿命为2~32年(平均12.3年),可测年轮为1~25个(平均7.9个)。绝大多数的死枝节子(占99.8%)会出现丢失年轮的现象,丢失年轮的数量为0~22个(平均为4.4个),88.6%的节子丢失1~7个年轮,丢失的年轮数超过7个的(8~22年)节子仅为11.2%。当林分年龄小于30年时,节子年轮丢失现象并不明显,随着年龄的增大,丢失年轮数急剧增长。丢失年轮的节子数量随着节子着生高度的增加而明显减少,节子的寿命、可观测年轮数、丢失年轮数随节子着生高度的增加而增大,达到最大值后呈稳定状态。节子的年轮数与节子的寿命成正比,呈明显线性递增关系。节子的寿命越长,则节子丢失年轮的数量就越多。樟子松平均丢失年轮数随着树木胸径的增大而增大,但与冠幅成反比。本研究结果为樟子松人工林的人工整枝提供了理论基础。

关键词: 樟子松, 节子, 寿命, 年轮, 丢失年轮, 整枝

Abstract:

The experiments were performed in Hengtoushan Forest Farm and Mengjiagang Forest Farm, Heilongjiang Province. The long, perceptible ring and missing ring of knots were analyzed for Pinus sylvertris var. mongolica plantation. The results showed that the long of knots ranged from 2 to 32 years (mean value is 12.3) and perceptible ring of knots ranged from 1 to 25 (mean value is 7.9) for P. sylvertris var. mongolica plantation. Most dead branches (or knots) (99.8%) have missing rings and the number of missing rings ranged from 0 to 22 (mean value is 4.4). There were 88.6% of all the knots have 1~7 missing rings and only 11.2% of all the knots have more missing rings (over 7). The phenomenon of missing ring for knots in the stand below 30 years was not obvious, but the number of missing rings increased rapidly with stand age increasing. The number of knots that have missing rings decreased with the increasing of knot height, but the long, perceptible ring and missing ring of knots increased with the increasing of knot height then reach a balance status after the peak value. The relationship between the number of ring and long of knots was positive linear. The missing rings increased with the increasing of knots long. The mean value of missing ring increased with the increasing of DBH and decreased with the increasing of crown width. The results of this research could provide the theory foundation of manual pruning for P. sylvertris var. mongolica plantation.

Key words: Pinus sylvestris var. mongolica, knot, long, annual ring, missing ring, pruning