Airborne boundary layer flux measurements of trace species over Canadian boreal forest and northern wetland regions

1994 ◽  
Vol 99 (D1) ◽  
pp. 1671 ◽  
Author(s):  
John A. Ritter ◽  
John D. W. Barrick ◽  
Catherine E. Watson ◽  
Glen W. Sachse ◽  
Gerald L. Gregory ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Boreal Forest ◽  
Trace Species ◽  
Flux Measurements ◽  
Canadian Boreal Forest

Airborne flux measurements of trace species in an Arctic boundary layer

1992 ◽  
Vol 97 (D15) ◽  
pp. 16601 ◽  
Author(s):  
John A. Ritter ◽  
John D. W. Barrick ◽  
Glen W. Sachse ◽  
Gerald L. Gregory ◽  
Mary A. Woerner ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Arctic Boundary Layer ◽  
Trace Species ◽  
Flux Measurements ◽  
Airborne Flux Measurements

Two new species of Oidiodendron from boreal forest soils

1968 ◽  
Vol 46 (3) ◽  
pp. 203-206 ◽  
Author(s):  
R. A. A. Morrall
Keyword(s):  
New Species ◽  
Boreal Forest ◽  
Forest Soils ◽  
Nomen Dubium ◽  
Two New Species ◽  
Canadian Boreal Forest

Oidiodendron periconioides Morrall sp. nov. and O. chlamydosporicum Morrall sp. nov. are described from Canadian boreal forest soils. O. gracile Zhdanova is considered to be a nomen dubium.

scholarly journals Ozone deposition into a boreal forest over a decade of observations: evaluating deposition partitioning and driving variables

2012 ◽  
Vol 12 (24) ◽  
pp. 12165-12182 ◽  
Author(s):  
Ü. Rannik ◽  
N. Altimir ◽  
I. Mammarella ◽  
J. Bäck ◽  
J. Rinne ◽  
...  
Keyword(s):  
Boreal Forest ◽  
Water Vapour ◽  
Environmental Variables ◽  
Total Ozone ◽  
Explanatory Power ◽  
Growing Season ◽  
Sink Strength ◽  
Ozone Deposition ◽  
Air Space ◽  
Flux Measurements

Abstract. This study scrutinizes a decade-long series of ozone deposition measurements in a boreal forest in search for the signature and relevance of the different deposition processes. The canopy-level ozone flux measurements were analysed for deposition characteristics and partitioning into stomatal and non-stomatal fractions, with the main focus on growing season day-time data. Ten years of measurements enabled the analysis of ozone deposition variation at different time-scales, including daily to inter-annual variation as well as the dependence on environmental variables and concentration of biogenic volatile organic compounds (BVOC-s). Stomatal deposition was estimated by using multi-layer canopy dispersion and optimal stomatal control modelling from simultaneous carbon dioxide and water vapour flux measurements, non-stomatal was inferred as residual. Also, utilising the big-leaf assumption stomatal conductance was inferred from water vapour fluxes for dry canopy conditions. The total ozone deposition was highest during the peak growing season (4 mm s−1) and lowest during winter dormancy (1 mm s−1). During the course of the growing season the fraction of the non-stomatal deposition of ozone was determined to vary from 26 to 44% during day time, increasing from the start of the season until the end of the growing season. By using multi-variate analysis it was determined that day-time total ozone deposition was mainly driven by photosynthetic capacity of the canopy, vapour pressure deficit (VPD), photosynthetically active radiation and monoterpene concentration. The multi-variate linear model explained the high portion of ozone deposition variance on daily average level (R2 = 0.79). The explanatory power of the multi-variate model for ozone non-stomatal deposition was much lower (R2 = 0.38). The set of common environmental variables and terpene concentrations used in multivariate analysis were able to predict the observed average seasonal variation in total and non-stomatal deposition but failed to explain the inter-annual differences, suggesting that some still unknown mechanisms might be involved in determining the inter-annual variability. Model calculation was performed to evaluate the potential sink strength of the chemical reactions of ozone with sesquiterpenes in the canopy air space, which revealed that sesquiterpenes in typical amounts at the site were unlikely to cause significant ozone loss in canopy air space. The results clearly showed the importance of several non-stomatal removal mechanisms. Unknown chemical compounds or processes correlating with monoterpene concentrations, including potentially reactions at the surfaces, contribute to non-stomatal sink term.

Fungi of the Canadian boreal forest region: Catulus aquilonius gen. et sp.nov., a hyperparasite on Seuratia millardetii

1978 ◽  
Vol 56 (19) ◽  
pp. 2344-2347 ◽  
Author(s):  
D. Malloch ◽  
C. T. Rogerson
Keyword(s):  
Boreal Forest ◽  
New Genus ◽  
New Genus And Species ◽  
Forest Region ◽  
Canadian Boreal Forest ◽  
Boreal Forest Region

A new genus and species of ascomycetes, Catulus aquilonius, is described, illustrated, and tentatively assigned to the Mycosphaerellaceae. It grows as a parasite on stromata of Seuratia millardetii (Raciborski) Meeker and is characterized by two-celled, setulose ascospores.

scholarly journals Large-area mapping of Canadian boreal forest cover, height, biomass and other structural attributes using Landsat composites and lidar plots

2018 ◽  
Vol 209 ◽  
pp. 90-106 ◽  
Author(s):  
Giona Matasci ◽  
Txomin Hermosilla ◽  
Michael A. Wulder ◽  
Joanne C. White ◽  
Nicholas C. Coops ◽  
...  
Keyword(s):  
Boreal Forest ◽  
Forest Cover ◽  
Large Area ◽  
Canadian Boreal Forest

Integrating accessibility and intactness into large-area conservation planning in the Canadian boreal forest

2013 ◽  
Vol 167 ◽  
pp. 371-379 ◽  
Author(s):  
Ryan P. Powers ◽  
Nicholas C. Coops ◽  
Trisalyn Nelson ◽  
Michael A. Wulder ◽  
C. Ronnie Drever
Keyword(s):  
Boreal Forest ◽  
Conservation Planning ◽  
Large Area ◽  
Canadian Boreal Forest

scholarly journals Fire deficit increases wildfire risk for many communities in the Canadian boreal forest

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Marc-André Parisien ◽  
Quinn E. Barber ◽  
Kelvin G. Hirsch ◽  
Christopher A. Stockdale ◽  
Sandy Erni ◽  
...  
Keyword(s):  
Boreal Forest ◽  
Wildfire Risk ◽  
Canadian Boreal Forest
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