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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
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
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
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
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
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
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
Sullivan, J. H., Bovard, B. D., Middleton, E. M.
Journal: Tree Physiology, Volume 17 (8-9): 553-561 (1997), ISBN . DOI: 10.1093/treephys/17.8-9.553 Sites: CA-Obs, CA-Ojp
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
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