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Filters: Sites: CA-Obs

Publications Found: 42

Environmental Regulation Of Carbon Dioxide Exchange At The Forest Floor In A Boreal Black Spruce Ecosystem
Swanson, R. V., Flanagan, L. B.

Measurements of CO₂ exchange at the forest floor were made in shady dry areas dominated by feather mosses and open wet areas dominated by Sphagnum mosses within a 120-year-old black spruce forest in central Saskatchewan during 1996. Our objective was to study the environmental regulation of moss photosynthesis …

Journal: Agricultural And Forest Meteorology, Volume 108 (3): 165-181 (2001). DOI: 10.1016/s0168-1923(01)00243-x Sites: CA-Obs

Environmental Controls On Ground Cover Species Composition And Productivity In A Boreal Black Spruce Forest
Bisbee, K., Gower, S., Norman, J., Nordheim, E.

Boreal black spruce forests typically have a dense ground cover of bryophytes. The two main bryophyte groups in boreal black spruce forests, feathermoss and Sphagnum, have ecophysiological characteristics that influence …

Journal: Oecologia, Volume 129 (2): 261-270 (2001). DOI: 10.1007/s004420100719 Sites: CA-Obs

Net Primary Production And Carbon Allocation Patterns Of Boreal Forest Ecosystems
Gower, S. T., Krankina, O., Olson, R. J., Apps, M., Linder, S., Wang, C.

Journal: Ecological Applications, Volume 11 (5): 1395-1411 (2001). DOI: 10.2307/3060928 Sites: CA-Man, CA-Obs

Photosynthesis And Light-Use Efficiency By Plants In A Canadian Boreal Forest Ecosystem
Whitehead, D., Gower, S. T.

Measurements of the photosynthetic response to midsummer irradiance were made for 11 species representing the dominant trees, understory shrubs, herbaceous plants and moss species in an old black spruce (Picea mariana (Mill.) B.S.P.) boreal forest ecosystem. Maximum rates of photosynthesis per unit …

Journal: Tree Physiology, Volume 21 (12-13): 925-929 (2001). DOI: 10.1093/treephys/21.12-13.925 Sites: CA-Obs

Remote Sensing Of Photosynthetic-Light-Use Efficiency Of Boreal Forest
Nichol, C. J., Huemmrich, K. F., Black, T., Jarvis, P. G., Walthall, C. L., Grace, J., Hall, F. G.

Using a helicopter-mounted portable spectroradiometer and continuous eddy covariance data we were able to evaluate the photochemical reflectance index (PRI) as an indicator of canopy photosynthetic light-use efficiency (LUE) in four boreal forest species during the Boreal …

Journal: Agricultural And Forest Meteorology, Volume 101 (2-3): 131-142 (2000). DOI: 10.1016/s0168-1923(99)00167-7 Sites: CA-Man, CA-Oas, CA-Obs, CA-Ojp

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

Seasonal Gas Exchange Of Black Spruce Using An Automatic Branch Bag System
Rayment, M. B., Jarvis, P. G.

Four large cuvettes were used to measure whole-branch CO₂ and H₂O vapour exchange at the Boreal Ecosystem-Atmosphere Study, Southern Study Area, Old Black Spruce site. Measurements started before the spring thaw and continued until after the winter freeze-up. Daytime photosynthesis, nighttime respiration, transpiration …

Journal: Canadian Journal Of Forest Research, Volume 29 (10): 1528-1538 (1999). DOI: 10.1139/cjfr-29-10-1528 Sites: CA-Obs, CA-SF2, CA-SF3
Posted: January 30, 2017

Measurements Of PAR Transmittance Within Boreal Forest Stands During BOREAS
Roujean, J.

This paper shows the results of solar flux measurements routinely collected within boreal conifer forests during BOREAS 1994. Such vegetation have open canopies with a high level of clumping and covered by crowns which yields strong directional effects on the spectral hemispherical …

Journal: Agricultural And Forest Meteorology, Volume 93 (1): 1-6 (1999). DOI: 10.1016/s0168-1923(98)00110-5 Sites: CA-Obs, CA-Ojp
Posted: January 27, 2017

Modeling BRFAnd Radiation Regime Of Boreal And Tropical Forests
Gastellu-Etchegorry, J., Guillevic, P., Zagolski, F., Demarez, V., Trichon, V., Deering, D., Leroy, M.

Monitoring of forest evolution and functioning with remote sensing depends on canopy BRF (bidirectional reflectance factor) sensitivity to biophysical parameters and to canopy PAR (photosynthetically active radiation) regime. Here, we study the canopy BRF of a tropical (Sumatra) …

Journal: Remote Sensing Of Environment, Volume 68 (3): 281-316 (1999). DOI: 10.1016/s0034-4257(98)00119-9 Sites: CA-Oas, CA-Obs, CA-Ojp
Posted: January 30, 2017

Structure Analysis And Classification Of Boreal Forests Using Airborne Hyperspectral BRDF Data From ASAS
Sandmeier, S., Deering, D.

A new approach is presented for deriving vegetation canopy structural characteristics from hyperspectral bidirectional reflectance distribution function (BRDF) data. The methodology is based on the relationship between spectral variability of BRDF effects and canopy geometry. …

Journal: Remote Sensing Of Environment, Volume 69 (3): 281-295 (1999). DOI: 10.1016/s0034-4257(99)00032-2 Sites: CA-Obs, CA-Ojp
Posted: January 30, 2017

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