Understorey–canopy affinities in boreal forest vegetation

1981 ◽  
Vol 59 (9) ◽  
pp. 1709-1716 ◽  
Author(s):  
T. J. Carleton ◽  
P. F. Maycock
Keyword(s):  
Boreal Forest ◽  
Relative Density ◽  
Forest Fire ◽  
Tree Species ◽  
Nutrient Status ◽  
James Bay ◽  
Apparent Lack ◽  
Stem Size ◽  
Single Tree ◽  
Natural Combination

One hundred and ninety-seven boreal forest stands, in a region of Ontario and Quebec south of James Bay, were examined. Tree species were summarized as relative density of each of five stem size classes. These data formed the basis for an exclusive polythetic divisive stand classification into 10 groups. Most of these groups were characterized by a single tree species. The affinity of each of 410 understorey taxa was assessed with respect to each canopy stand group or natural combination of groups. Only 121 understorey taxa showed specificity to the canopy classes identified. This apparent lack of tight overstorey–understorey affinity is discussed in relation to site nutrient status and regeneration following forest fire.

OCCURRENCE OF CARABID BEETLES (COLEOPTERA: CARABIDAE) IN A BOREAL FOREST DAMAGED BY FIRE

1982 ◽  
Vol 114 (6) ◽  
pp. 509-514 ◽  
Author(s):  
R. J. Richardson ◽  
N. J. Holliday
Keyword(s):  
Boreal Forest ◽  
Forest Fire ◽  
Tree Species ◽  
Indirect Effects ◽  
Similar Pattern ◽  
Habitat Change ◽  
Carabid Beetles ◽  
Pitfall Traps

AbstractFifteen months after an intense forest fire, the fauna of carabid beetles in burnt and unburnt sites was sampled using pitfall traps to detect the indirect effects of fire on carabids caused by habitat change. Traps were installed in burnt and unburnt sites in which the dominant tree species before the fire was either spruce or aspen. The most commonly caught species was Pterostichus pensylvanicus which was captured more frequently in unburnt sites, but was not affected by dominant tree species; a similar pattern of distribution of captures was found for Carabus taedatus. Harpalus laticeps was captured only in burnt sites. P. lucublandus and Dicaelus sculptilis upioides were most commonly caught in the unburnt aspen site, while Pterostichus adstrictus was most commonly caught in the burnt spruce site.

Dynamics of the boreal forest south of James Bay

1978 ◽  
Vol 56 (9) ◽  
pp. 1157-1173 ◽  
Author(s):  
T. J. Carleton ◽  
P. F. Maycock
Keyword(s):  
Boreal Forest ◽  
Tree Species ◽  
Forest Succession ◽  
Black Spruce ◽  
Abies Balsamea ◽  
Primary Forest ◽  
General Notion ◽  
Forest Stands ◽  
James Bay ◽  
Forest Zone

Ordination models of approximate environmental and dynamic relationship between eight boreal tree species were constructed based upon principal components analysis and Kruskal's nonmetric multidimensional scaling. The assumptions inherent in these models are stated and discussed. The data consisted of 152 forest stands from the closed-crown boreal forest zone of Ontario and Quebec south of James Bay. Sequential forest succession, as demonstrated by similar techniques for a section of the Wisconsin evergreen–hardwood forest, is not common in the region of boreal forest studied. However, for those species in common between this and the Wisconsin study, similar dynamic pathways are indicated despite differences in sample size and field technique. Tree species developmental pathways, as indicated by 'succession vectors' on the ordination models are, for the most part, short and circular with the exception of Abies balsamea (balsam fir). This reflects the reestablishment of similar, relatively monospecific forest stands following catastrophic forest destruction by fire and (or) other agencies. Where catastrophe does not intervene, deciduous primary forest species may be succeeded by an understory of A. balsamea or by Picea mariana (black spruce). Equally, some forest stands of primary establishment may become decadent with little or no subsequent tree growth. These observations are discussed with respect to the general notion of forest succession.

Observations of boreal forest fire smoke in the stratosphere by POAM III, SAGE II, and lidar in 1998

2000 ◽  
Vol 27 (9) ◽  
pp. 1407-1410 ◽  
Author(s):  
Michael Fromm ◽  
Jerome Alfred ◽  
Karl Hoppel ◽  
John Hornstein ◽  
Richard Bevilacqua ◽  
...  
Keyword(s):  
Boreal Forest ◽  
Forest Fire ◽  
Fire Smoke

Carbon cycling after boreal forest fire

Science ◽  
2021 ◽  
Vol 372 (6539) ◽  
pp. 250.1-250
Author(s):  
Andrew M. Sugden
Keyword(s):  
Boreal Forest ◽  
Carbon Cycling ◽  
Forest Fire

scholarly journals Mapping Regional Distribution of a Single Tree Species: Whitebark Pine in the Greater Yellowstone Ecosystem

Sensors ◽  
2008 ◽  
Vol 8 (8) ◽  
pp. 4983-4994 ◽  
Author(s):  
Lisa Landenburger ◽  
Rick Lawrence ◽  
Shannon Podruzny ◽  
Charles Schwartz
Keyword(s):  
Tree Species ◽  
Regional Distribution ◽  
Greater Yellowstone Ecosystem ◽  
Whitebark Pine ◽  
Single Tree ◽  
Greater Yellowstone

scholarly journals Plant, fungal, bacterial, and nitrogen interactions in the litter layer of a native Patagonian forest

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4754 ◽  
Author(s):  
Lucía Vivanco ◽  
Nicolás Rascovan ◽  
Amy T. Austin
Keyword(s):  
Bacterial Community ◽  
Litter Decomposition ◽  
Plant Species ◽  
Tree Species ◽  
Microbial Interactions ◽  
N Addition ◽  
Litter Layer ◽  
Species Identity ◽  
Single Tree ◽  
Stimulation Of

Plant–microbial interactions in the litter layer represent one of the most relevant interactions for biogeochemical cycling as litter decomposition is a key first step in carbon and nitrogen turnover. However, our understanding of these interactions in the litter layer remains elusive. In an old-growth mixed Nothofagus forest in Patagonia, we studied the effects of single tree species identity and the mixture of three tree species on the fungal and bacterial composition in the litter layer. We also evaluated the effects of nitrogen (N) addition on these plant–microbial interactions. In addition, we compared the magnitude of stimulation of litter decomposition due to home field advantage (HFA, decomposition occurs more rapidly when litter is placed beneath the plant species from which it had been derived than beneath a different plant species) and N addition that we previously demonstrated in this same forest, and used microbial information to interpret these results. Tree species identity had a strong and significant effect on the composition of fungal communities but not on the bacterial community of the litter layer. The microbial composition of the litter layer under the tree species mixture show an averaged contribution of each single tree species. N addition did not erase the plant species footprint on the fungal community, and neither altered the bacterial community. N addition stimulated litter decomposition as much as HFA for certain tree species, but the mechanisms behind N and HFA stimulation may have differed. Our results suggest that stimulation of decomposition from N addition might have occurred due to increased microbial activity without large changes in microbial community composition, while HFA may have resulted principally from plant species’ effects on the litter fungal community. Together, our results suggest that plant–microbial interactions can be an unconsidered driver of litter decomposition in temperate forests.

scholarly journals Production of peroxy nitrates in boreal biomass burning plumes over Canada during the BORTAS campaign

2016 ◽  
Vol 16 (5) ◽  
pp. 3485-3497 ◽  
Author(s):  
Marcella Busilacchio ◽  
Piero Di Carlo ◽  
Eleonora Aruffo ◽  
Fabio Biancofiore ◽  
Cesare Dari Salisburgo ◽  
...  
Keyword(s):  
Boreal Forest ◽  
Forest Fire ◽  
Biomass Burning ◽  
Forest Fires ◽  
Chemical Mechanism ◽  
Fire Emissions ◽  
Fire Plumes ◽  
Peroxy Nitrates ◽  
In Fire ◽  
The Impact

Abstract. The observations collected during the BOReal forest fires on Tropospheric oxidants over the Atlantic using Aircraft and Satellites (BORTAS) campaign in summer 2011 over Canada are analysed to study the impact of forest fire emissions on the formation of ozone (O3) and total peroxy nitrates ∑PNs, ∑ROONO2). The suite of measurements on board the BAe-146 aircraft, deployed in this campaign, allows us to calculate the production of O3 and of  ∑PNs, a long-lived NOx reservoir whose concentration is supposed to be impacted by biomass burning emissions. In fire plumes, profiles of carbon monoxide (CO), which is a well-established tracer of pyrogenic emission, show concentration enhancements that are in strong correspondence with a significant increase of concentrations of ∑PNs, whereas minimal increase of the concentrations of O3 and NO2 is observed. The ∑PN and O3 productions have been calculated using the rate constants of the first- and second-order reactions of volatile organic compound (VOC) oxidation. The ∑PN and O3 productions have also been quantified by 0-D model simulation based on the Master Chemical Mechanism. Both methods show that in fire plumes the average production of ∑PNs and O3 are greater than in the background plumes, but the increase of ∑PN production is more pronounced than the O3 production. The average ∑PN production in fire plumes is from 7 to 12 times greater than in the background, whereas the average O3 production in fire plumes is from 2 to 5 times greater than in the background. These results suggest that, at least for boreal forest fires and for the measurements recorded during the BORTAS campaign, fire emissions impact both the oxidized NOy and O3,  but (1 ∑PN production is amplified significantly more than O3 production and (2) in the forest fire plumes the ratio between the O3 production and the ∑PN production is lower than the ratio evaluated in the background air masses, thus confirming that the role played by the ∑PNs produced during biomass burning is significant in the O3 budget. The implication of these observations is that fire emissions in some cases, for example boreal forest fires and in the conditions reported here, may influence more long-lived precursors of O3 than short-lived pollutants, which in turn can be transported and eventually diluted in a wide area.

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