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Post fire regeneration dynamics of white spruce and aspen in a southern boreal forest in Alberta.

机译:在艾伯塔省南部的北方森林中,白云杉和白杨的火灾后再生动态。

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摘要

I used data from 149 repeated aerial photographs taken in (1950s), middle (1970s or 1980s) and recent (1990s) times, together with forest inventory maps prepared by the Alberta Environmental Protection Agency in the year 1999 known as "Phase 3 inventory maps" to analyze changes in spruce crown closure (percentage of canopy cover) and height in mixed forest stands dominated by aspen (Populus tremuloides Michx) and white spruce (Picea glauca (Moench) Voss) in a boreal forest in Alberta, Canada.; A total of 81 stands located in good (N = 11), medium (N = 60), and fair (N = 10) quality sites were studied for spruce emergence. Site quality and the time since the last fire accounted for about 70% of the variance in spruce canopy cover. A significant correlation between spruce crown closure and age was detected in good (r2 = 0.71), medium (r2 = 0.81) and fair (r2 = 0.54) quality sites. There was no significant correlation between the rate of change in spruce cover (% cover/year) and the time since the last fire. The white spruce reached the main forest canopy height and overtopped the aspen in about 80--100 years since the fire. Results of the present study suggest that a longer time is required for the emergence of spruce through aspen canopy than previous estimates.
机译:我使用了从(1950年代),中期(1970年代或1980年代)和最近(1990年代)拍摄的149张重复航空照片中获得的数据,以及艾伯塔省环境保护局在1999年制作的森林清单图,称为“第三阶段清单图”。 “分析在加拿大艾伯塔省的一个北方森林中,以白杨木(Populus tremuloides Michx)和白云杉(Picea glauca(Moench)Voss)为主的混合林林分中云杉冠的闭合度(冠层覆盖率)和高度的变化;研究了位于高品质(N = 11),中等(N = 60)和中等(N = 10)质量站点的81个林分出现的云杉。现场质量和自上次火灾以来的时间约占云杉冠层覆盖变化的70%。在优质(r2 = 0.71),中等(r2 = 0.81)和中等(r2 = 0.54)质量的站点中,云杉冠的闭合与年龄之间存在显着的相关性。云杉覆盖率的变化率(百分比覆盖率/年)与自上次火灾以来的时间之间没有显着相关性。火灾发生后约80--100年,白云杉达到了主要的林冠高度,并超过了白杨。本研究的结果表明,通过白杨树冠出现的云杉比以前的估计需要更长的时间。

著录项

  • 作者

    Sun, Jian Feng.;

  • 作者单位

    Concordia University (Canada).;

  • 授予单位 Concordia University (Canada).;
  • 学科 Biology Ecology.; Agriculture Forestry and Wildlife.; Biology Botany.
  • 学位 M.Sc.
  • 年度 2005
  • 页码 62 p.
  • 总页数 62
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生态学(生物生态学);森林生物学;植物学;
  • 关键词

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