scholarly journals Climate and disturbance regime effects on aspen (Populus tremuloidesMichx.) stand structure and composition along an east–west transect in Canada's boreal forest

2016 ◽  
Vol 90 (1) ◽  
pp. 70-81 ◽  
Author(s):  
Pierre Nlungu-Kweta ◽  
Alain Leduc ◽  
Yves Bergeron
Keyword(s):  
Boreal Forest ◽  
Stand Structure ◽  
Disturbance Regime ◽  
East West

Colorimetric analysis of the dorsal plumage of the red-eyed vireo (Aves: Vireonidae) in Canada

1971 ◽  
Vol 49 (3) ◽  
pp. 417-419 ◽  
Author(s):  
Jon C. Barlow ◽  
Nikki Williams
Keyword(s):  
Boreal Forest ◽  
Test Procedure ◽  
Sums Of Squares ◽  
Climatic Variable ◽  
Colorimetric Analysis ◽  
Dominant Wavelength ◽  
Simultaneous Test ◽  
Character Variation ◽  
Recording Spectrophotometer ◽  
East West

The red-eyed vireo is widely distributed across Canada in the boreal forest. Collections were made at seven localities from central Alberta to central Quebec and potential variation in the olive-green dorsal plumage was analyzed with a recording spectrophotometer equipped with a reflectance attachment. The trichromatic coefficients x (dominant wavelength) and y (purity) and Y (the percentage luminous reflection or brightness) were subjected to an overall analysis of variance, and means were treated with Gabriel's sums of squares simultaneous test procedure. Significant differences were demonstrated among locality samples for Y and x but the STP revealed discordant variation among locality samples, i.e. no east–west clines in character variation were shown. Regressions of Y and x on precipitation were nearly significant and could suggest a weak clinal relationship between color and this climatic variable as predicted by the ecogeographic rule of Gloger.

Sensitivity of ERS-1 and JERS-1 radar data to biomass and stand structure in Alaskan boreal forest

1995 ◽  
Vol 54 (3) ◽  
pp. 247-260 ◽  
Author(s):  
P.A. Harrell ◽  
L.L. Bourgeau-Chavez ◽  
E.S. Kasischke ◽  
N.H.F. French ◽  
N.L. Christensen
Keyword(s):  
Boreal Forest ◽  
Stand Structure ◽  
Radar Data

Stand structure and successional trends in virgin boreal forest reserves in Sweden

1997 ◽  
Vol 98 (1) ◽  
pp. 17-33 ◽  
Author(s):  
Per Linder ◽  
Björn Elfving ◽  
Olle Zackrisson
Keyword(s):  
Boreal Forest ◽  
Stand Structure ◽  
Forest Reserves

Stand structure and regeneration in a Kamchatka mixed boreal forest

2001 ◽  
Vol 12 (5) ◽  
pp. 627-634 ◽  
Author(s):  
Koichi Takahashi ◽  
Kosuke Homma ◽  
Valentina P. Vetrova ◽  
Sergey Florenzev ◽  
Toshihiko Hara
Keyword(s):  
Boreal Forest ◽  
Stand Structure

Partial windthrow as a driving process of forest dynamics in old-growth boreal forests

2014 ◽  
Vol 44 (10) ◽  
pp. 1165-1176 ◽  
Author(s):  
François Girard ◽  
Louis De Grandpré ◽  
Jean-Claude Ruel
Keyword(s):  
Boreal Forest ◽  
Forest Dynamics ◽  
Boreal Forests ◽  
Tree Mortality ◽  
Stand Structure ◽  
Temporal Dynamics ◽  
Spruce Budworm ◽  
Climatic Conditions ◽  
Balsam Fir ◽  
Vegetation Development

As climate changes, boreal forest ecosystems may become subject to disturbances that were previously uncommon in some regions. In recent decades, large tracts of northeastern boreal forest of Canada have been affected by different types of climatic events causing a lot of partial and some total stand mortality. Since these disturbances may become more important drivers of forest dynamics, there is a need to document their impact on forest structure. The objectives of this study were to describe temporal dynamics of partial windthrows and determine the effect of partial windthrow on stand composition and understory vegetation. The study was conducted in the North-Shore region of Quebec (Canada). Eighteen plots in closed forests were paired with 18 adjacent windthrow areas, in which trees experienced similar edaphic and climatic conditions. Dendroecological analyses, combined with vegetation sampling, were conducted on each site to determine stand structure and vegetation development through time. Significant increases in balsam fir and shade-tolerant species were observed in windthrow gaps. Tree mortality in windthrown stands was a slow process until the mid-1990s, a period during which spruce budworm defoliation may have played a role in weakening trees and making them more vulnerable to partial windthrow. Greater mortality observed following the mid-1990s was most certainly related to a regional storm. The initial composition of stands plays an important role in driving postwindthrow succession, as balsam fir is more susceptible to treefall. As opposed to stand-replacing windthrow and spruce budworm outbreaks that generate various postdisturbance responses, partial windthrow appears to only create opportunities for pre-established balsam fir to undergo release in gaps.

Effects of time since stand-replacing fire and overstory composition on live-tree structural diversity in the boreal forest of central Canada

2008 ◽  
Vol 38 (1) ◽  
pp. 52-62 ◽  
Author(s):  
Brian W. Brassard ◽  
Han Y.H. Chen ◽  
Jian R. Wang ◽  
Peter N. Duinker
Keyword(s):  
Boreal Forest ◽  
Coefficient Of Variation ◽  
Stand Structure ◽  
Diversity Index ◽  
Stand Development ◽  
Stand Volume ◽  
Diameter At Breast Height ◽  
Breast Height ◽  
Shaped Pattern ◽  
Mixedwood Stands

Stand structure diversity is hypothesized (i) to increase with stand development and (ii) to be greater in mixedwood stands than in conifer and broadleaf stands. We examined the effects of time since stand-replacing fire (TSF) and overstory type on stand volume, stand density, and tree-size variability, which is measured using Shannon’s diversity index (H′) and coefficient of variation, in fire-origin boreal forest stands. We sampled 36 stands representing conifer, mixedwood, and broadleaf overstory types, ranging in ages from 72 to 201 years TSF on upland mesic sites in northwestern Ontario, Canada. Stand volume decreased in older mixedwood and broadleaf stands, but followed a U-shaped pattern in conifer stands with TSF. Diameter-at-breast-height-based H′ followed an inverse U-shaped pattern with TSF for all overstory types. Height-based H′ decreased with TSF in conifer and mixedwood stands but peaked at the intermediate age class in broadleaf stands. Diameter-at-breast-height- and height-based coefficient of variation indices followed an inverse U-shaped distribution with TSF. Our results partially supported the two hypotheses, as (i) the 124- to 139-year-old stands were most diverse and (ii) mixedwood stands were more than or as equally diverse as conifer and broadleaf stands, depending on stand development stage and the diversity indices used.

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