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Filters: Sites: CA-Obs

Publications Found: 42

Characterization Of Radiation Regimes In Nonrandom Forest Canopies: Theory, Measurements, And A Simplified Modeling Approach
Kucharik, C. J., Norman, J. M., Gower, S. T.

We used field measurements and Monte Carlo simulations of canopy gap-size distribution and gap fraction to examine how beam radiation interacts with clumped boreal forest canopies of aspen (Populus tremuloides Michx.), black spruce (Picea mariana (Mill.) B.S.P.) and jack pine (Pinus …

Journal: Tree Physiology, Volume 19 (11): 695-706 (1999). DOI: 10.1093/treephys/19.11.695 Sites: CA-Man, CA-Obs, CA-Ojp
Posted: January 30, 2017

Root Mass, Net Primary Production And Turnover In Aspen, Jack Pine And Black Spruce Forests In Saskatchewan And Manitoba, Canada
Steele, S. J., Gower, S. T., Vogel, J. G., Norman, J. M.

Root biomass, net primary production and turnover were studied in aspen, jack pine and black spruce forests in two contrasting climates. The climate of the Southern Study Area (SSA) near Prince Albert, Saskatchewan is warmer and drier in the summer and milder in the winter than the Northern Study Area (NSA) near Thompson, Manitoba, …

Journal: Tree Physiology, Volume 17 (8-9): 577-587 (1997). DOI: 10.1093/treephys/17.8-9.577 Sites: CA-Man, CA-Oas, CA-Obs, CA-Ojp
Posted: January 27, 2017

Transpiration Of A Boreal Pine Forest Measured By Branch Bag, Sap Flow And Micrometeorological Methods
Saugier, B., Granier, A., Pontailler, J. Y., Dufrene, E., Baldocchi, D. D.

Three independent methods were used to evaluate transpiration of a boreal forest: the branch bag, sap flow and eddy covariance methods. The branch bag method encloses several thousand needles and gives a continuous record of branch transpiration. The sap flow method provides a continuous record of sap velocity and an estimate of …

Journal: Tree Physiology, Volume 17 (8-9): 511-519 (1997). DOI: 10.1093/treephys/17.8-9.511 Sites: CA-Obs
Posted: January 30, 2017

Automated Measurements Of CO2 Exchange At The Moss Surface Of A Black Spruce Forest
Goulden, M. L., Crill, P. M.

We used an automated, multiplexing gas-exchange system to measure the net exchange of CO₂ at the surfaces of three shady feather moss and three exposed sphagnum moss sites in a black spruce forest during 35 days at the end of the 1995 growing season. Midday gross photosynthesis was 0.5 to 1.0 μmol m⁻² s⁻¹ …

Journal: Tree Physiology, Volume 17 (8-9): 537-542 (1997). DOI: 10.1093/treephys/17.8-9.537 Sites: CA-Obs
Posted: January 25, 2017

Growth And Maintenance Respiration Rates Of Aspen, Black Spruce And Jack Pine Stems At Northern And Southern BOREAS Sites
Lavigne, M. B., Ryan, M. G.

We measured stem respiration rates during and after the 1994 growing season of three common boreal tree species at sites near the northern and southern boundaries of the closed-canopy boreal forest in central Canada. The growth respiration coefficient (r_g; carbon efflux per μmole of carbon incorporated in structural …

Journal: Tree Physiology, Volume 17 (8-9): 543-551 (1997). DOI: 10.1093/treephys/17.8-9.543 Sites: CA-Man, CA-Oas, CA-Obs, CA-Ojp
Posted: January 31, 2017

Seasonal Variation Of Carbon Dioxide, Water Vapor, And Energy Exchanges Of A Boreal Black Spruce Forest
Jarvis, P. G., Massheder, J. M., Hale, S. E., Moncrieff, J. B., Rayment, M., Scott, S. L.

Measurements of the fluxes of latent heat λE, sensible heat H, and CO₂ were made by eddy covariance in a boreal black spruce forest as part of the Boreal Ecosystem-Atmosphere Study (BOREAS) for 120 days through the growing season in 1994. BOREAS is a multiscale study in which satellite, airborne, stand-scale, …

Journal: Journal Of Geophysical Research: Atmospheres, Volume 102 (D24): 28953-28966 (1997). DOI: 10.1029/97jd01176 Sites: CA-Obs
Posted: January 31, 2017

Variability In Leaf-Level CO2 And Water Fluxes In Pinus Banksiana And Picea Mariana In Saskatchewan
Sullivan, J. H., Bovard, B. D., Middleton, E. M.

We measured seasonal and canopy-level gas exchange in two stands of jack pine (Pinus banksianaLamb.) and one stand of black spruce (Picea mariana (Mill.) B.S.P.) on relatively clear days from late May until mid-September 1994. Field measurements were made with a portable infrared gas analyzer, …

Journal: Tree Physiology, Volume 17 (8-9): 553-561 (1997). DOI: 10.1093/treephys/17.8-9.553 Sites: CA-Obs, CA-Ojp
Posted: January 30, 2017

A Physiological Basis For Biosphere-Atmosphere Interactions In The Boreal Forest: An Overview
Margolis, H. A., Ryan, M. G.

Interdisciplinary field experiments for global change research are large, intensive efforts that study the controls on fluxes of carbon, water, trace gases, and energy between terrestrial ecosystems and the atmosphere at a range of spatial scales. Forest ecophysiology can make significant contributions to …

Journal: Tree Physiology, Volume 17 (8-9): 491-499 (1997). DOI: 10.1093/treephys/17.8-9.491 Sites: CA-Man, CA-Oas, CA-Obs, CA-Ojp
Posted: January 31, 2017

Simulating Forest Productivity And Surface-Atmosphere Carbon Exchange In The BOREAS Study Region
Kimball, J. S., Thornton, P. E., White, M. A., Running, S. W.

A process-based, general ecosystem model (BIOME–BGC) was used to simulate daily gross primary production, maintenance and heterotrophic respiration, net primary production and net ecosystem carbon exchange of boreal aspen, jack pine and black spruce stands. Model simulations of daily net carbon exchange of the ecosystem (NEE) explained …

Journal: Tree Physiology, Volume 17 (8-9): 589-599 (1997). DOI: 10.1093/treephys/17.8-9.589 Sites: CA-Man, CA-Oas, CA-Obs, CA-Ojp
Posted: January 27, 2017

Controls Over Monoterpene Emissions From Boreal Forest Conifers
Lerdau, M., Litvak, M., Palmer, P., Monson, R.

We investigated controls over the emission of monoterpenes from two species of boreal forest conifers, black spruce (Picea mariana Miller (B.S.P.)) and jack pine (Pinus banksiana Lamb). Monoterpenes are important in plants as carbon-based defensive compounds and in the atmosphere as photochemically reactive compounds …

Journal: Tree Physiology, Volume 17 (8-9): 563-569 (1997). DOI: 10.1093/treephys/17.8-9.563 Sites: CA-Oas, CA-Obs, CA-Ojp
Posted: January 27, 2017

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