Publications

Publications Found: 1437

Intra- And Inter-Specific Variation In Canopy Photosynthesis In A Mixed Deciduous Forest
Bassow, S. L., Bazzaz, F. A.

Within the same forest, photosynthesis can vary greatly among species and within an individual tree. Quantifying the magnitude of variation in leaf-level photosynthesis in a forest canopy will improve our understanding of and ability to model forest carbon cycling. This information requires extensive sampling of photosynthesis in …


Journal: Oecologia, Volume 109 (4): 507-515 (1997). DOI: 10.1007/s004420050111 Sites: US-Ha1

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

A Lagrangian Dispersion Model For Predicting CO2 Sources, Sinks, And Fluxes In A Uniform Loblolly Pine (Pinus Taeda L.) Stand
Katul, G., Oren, R., Ellsworth, D., Hsieh, C., Phillips, N., Lewin, K.

A canopy Lagrangian turbulent scalar transport model for predicting scalar fluxes, sources, and sinks within a forested canopy was tested using CO2 concentration and flux measurements. The model formulation is based on the localized near-field theory (LNF) proposed by Raupach [1989a, b]. Using the measured mean …


Journal: Journal Of Geophysical Research: Atmospheres, Volume 102 (D8): 9309-9321 (1997). DOI: 10.1029/96jd03785 Sites: US-Dk3

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

Cold Season CO2 Emission From Arctic Soils
Oechel, W. C., Vourlitis, G., Hastings, S. J.

Recent evidence indicates that significant amounts of C may be lost as CO2 to the atmosphere from tundra ecosystems during the fall, winter and spring months. Because high latitude ecosystems are …


Journal: Global Biogeochemical Cycles, Volume 11 (2): 163-172 (1997). DOI: 10.1029/96gb03035 Sites: US-HVa, US-Upa

Carbon Distribution And Aboveground Net Primary Production In Aspen, Jack Pine, And Black Spruce Stands In Saskatchewan And Manitoba, Canada
Gower, S. T., Vogel, J. G., Norman, J. M., Kucharik, C. J., Steele, S. J., Stow, T. K.

The objectives of this study are to (1) characterize the carbon (C) content, leaf area index, and aboveground net primary production (ANPP) for mature aspen, black spruce, and young and mature jack pine stands at the southern and northern Boreal Ecosystem-Atmosphere Study (BOREAS) areas and (2) compare net primary production and …


Journal: Journal Of Geophysical Research: Atmospheres, Volume 102 (D24): 29029-29041 (1997). DOI: 10.1029/97jd02317 Sites: CA-SJ3

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

Leaf δ13C In Pinus Resinosa Trees And Understory Plants: Variation Associated With Light And CO2 Gradients
Berry, S. C., Varney, G. T., Flanagan, L. B.

 Our objective was to evaluate the relative importance of gradients in light intensity and the isotopic composition of atmospheric CO2 for variation in leaf carbon isotope ratios within a Pinus resinosa forest. …


Journal: Oecologia, Volume 109 (4): 499-506 (1997). DOI: 10.1007/s004420050110 Sites: CA-Mer

Regulation Of Branch-Level Gas Exchange Of Boreal Trees: Roles Of Shoot Water Potential And Vapor Pressure Difference
Dang, Q., Margolis, H. A., Coyea, M. R., Sy, M., Collatz, G. J.

Effects of shoot water potential (Ψ) and leaf-to-atmosphere vapor pressure difference (VPD) on gas exchange of jack pine (Pinus banksiana Lamb.), black spruce (Picea mariana (Mill.) B.S.P.), and aspen (Populus tremuloides Michx.) were investigated at the northern edge of the boreal forest in Manitoba, …


Journal: Tree Physiology, Volume 17 (8-9): 521-535 (1997). DOI: 10.1093/treephys/17.8-9.521 Sites: CA-Man

Measuring And Modelling Carbon Dioxide And Water Vapour Exchange Over A Temperate Broad-Leaved Forest During The 1995 Summer Drought
Baldocchi, D.

Forests in the south-eastern United States experienced a prolonged dry spell and above-normal temperatures during the 1995 growing season. During this episode, nearly continuous, …


Journal: Plant, Cell And Environment, Volume 20 (9): 1108-1122 (1997). DOI: 10.1046/j.1365-3040.1997.d01-147.x Sites: US-WBW