Publications

Publications Found: 1373

Environmental Controls Over Isoprene Emission In Deciduous Oak Canopies
Harley, P., Guenther, A., Zimmerman, P.

In summer 1992, isoprene emission was measured on intact leaves and branches of Quercus alba (L.) at two heights in a forest canopy. Isoprene emission capacity (measured at 30 °C and a photosynthetic photon flux density of 1000 μmol m−2 s−1) was significantly higher in sun leaves than in shade …


Journal: Tree Physiology, Volume 17 (11): 705-714 (1997), ISBN . DOI: 10.1093/treephys/17.11.705 Sites: US-WBW

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), ISBN . DOI: 10.1093/treephys/17.8-9.577 Sites: CA-Man, CA-Oas, CA-Obs, CA-Ojp

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), ISBN . DOI: 10.1029/96jd03785 Sites: US-Dk3

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), ISBN . DOI: 10.1007/s004420050111 Sites: US-Ha1

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), ISBN . DOI: 10.1093/treephys/17.8-9.521 Sites: CA-Man

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), ISBN . DOI: 10.1007/s004420050110 Sites: CA-Mer

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), ISBN . DOI: 10.1029/96gb03035 Sites: US-HVa, US-Upa

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), ISBN . DOI: 10.1093/treephys/17.8-9.553 Sites: CA-Obs, CA-Ojp

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), ISBN . DOI: 10.1046/j.1365-3040.1997.d01-147.x Sites: US-WBW

Seasonal Variation Of Energy And Water Vapor Exchange Rates Above And Below A Boreal Jack Pine Forest Canopy
Baldocchi, D. D., Vogel, C. A., Hall, B.

Fluxes of energy and water vapor over boreal forest stands are expected to vary during the growing season due to temporal variations in solar energy, soil and air temperature, soil moisture, photosynthetic …


Journal: Journal Of Geophysical Research: Atmospheres, Volume 102 (D24): 28939-28951 (1997), ISBN . DOI: 10.1029/96jd03325 Sites: CA-Ojp