Publications

Publications Found: 1437

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

Seasonal Variations Of CO2 And Water Vapour Exchange Rates Over A Temperate Deciduous Forest
Greco, S., Baldocchi, D. D.

Long-term and direct measurements of CO2 and water vapour exchange are needed over forested ecosystems to determine their net annual fluxes of carbon dioxide and water. Such measurements are also needed to parameterize and test biogeochemical, ecological and hydrological assessment models. Responding to this need, eddy …


Journal: Global Change Biology, Volume 2 (3): 183-197 (1996). DOI: 10.1111/j.1365-2486.1996.tb00071.x Sites: US-WBW

Soil Aggregate Formation And The Accrual Of Particulate And Mineral-Associated Organic Matter
Jastrow, J.

The degradation of soil aggregates appears to be a primary mechanism in the loss of organic matter caused by long-term cultivation, but little information exists on how the formation and stabilization of macroaggregates control the process of C aggradation when disturbance is reduced or eliminated. A chronosequence of restored tallgrass …


Journal: Soil Biology And Biochemistry, Volume 28 (4-5): 665-676 (1996). DOI: 10.1016/0038-0717(95)00159-x Sites: US-IB1, US-IB2

Seasonal Variation In Radiative And Turbulent Exchange At A Deciduous Forest In Central Massachusetts
Moore, K. E., Fitzjarrald, D. R., Sakai, R. K., Goulden, M. L., Munger, J. W., Wofsy, S. C.

Temperate deciduous forests exhibit dramatic seasonal changes in surface exchange properties following on the seasonal changes in leaf area index. Nearly continuous measurements of turbulent and radiative fluxes above and below the canopy of a red oak forest in central Massachusetts have been ongoing since the summer of 1991. Several …


Journal: Journal Of Applied Meteorology, Volume 35 (1): 122-134 (1996). DOI: 10.1175/1520-0450(1996)035<0122:SVIRAT>2.0.CO;2 Sites: US-Ha1

Energy And CO2 Flux Densities Above And Below A Temperate Broad-Leaved Forest And A Boreal Pine Forest
Baldocchi, D. D., Vogel, C. A.

Fluxes of carbon dioxide, water vapor and energy were measured above and below a temperate broad-leaved forest and a boreal jack pine (Pinus banksiania Lamb.) forest by the eddy covariance method. The aim of the work was to examine differences between the biological and physical processes that control the fluxes of mass …


Journal: Tree Physiology, Volume 16 (1-2): 5-16 (1996). DOI: 10.1093/treephys/16.1-2.5 Sites: US-WBW

Measurements Of Carbon Sequestration By Long-Term Eddy Covariance: Methods And A Critical Evaluation Of Accuracy
Goulden, M. L., Munger, J. W., Fan, S., Daube, B. C., Wofsy, S. C.

The turbulent exchanges of CO2 and water vapour between an aggrading deciduous forest in the north-eastern United States (Harvard Forest) and the atmosphere were measured from 1990 to 1994 using the eddy covariance technique. We present a detailed description of the methods used and a rigorous evaluation of the precision …


Journal: Global Change Biology, Volume 2 (3): 169-182 (1996). DOI: 10.1111/j.1365-2486.1996.tb00070.x Sites: US-Ha1

Measurements Of Upward Turbulent Ozone Fluxes Above A Subalpine Spruce-Fir Forest
Zeller, K., Hehn, T.

High rural concentrations of ozone (O3) are thought to be either stratospheric in origin, advected from upwind urban sources, or photochemically generated locally as a result of natural trace gas emissions. Ozone is known to be transported vertically downward from the above-canopy atmospheric surface layer and destroyed …


Journal: Geophysical Research Letters, Volume 23 (8): 841-844 (1996). DOI: 10.1029/96gl00786 Sites: US-GBT

Carbon Isotope Discrimination During Photosynthesis And The Isotope Ratio Of Respired CO2 in Boreal Forest Ecosystems
Flanagan, L. B., Brooks, J. R., Varney, G. T., Berry, S. C., Ehleringer, J. R.

Our objective was to measure the carbon isotope ratio of CO2 released by respiration (δr) within forest canopies at different times during the growing season and to use this information to estimate forest ecosystem carbon isotope discrimination. We made measurements in the three major forest types (black spruce, …


Journal: Global Biogeochemical Cycles, Volume 10 (4): 629-640 (1996). DOI: 10.1029/96gb02345 Sites: CA-Let

Carbon Dioxide Exchange And Nocturnal Processes Over A Mixed Deciduous Forest
Lee, X., Black, T., den Hartog, G., Neumann, H. H., Nesic, Z., Olejnik, J.

This paper reports the results of the analysis of CO2 exchange from a one-month experiment conducted at a mixed deciduous forest, Camp Borden (80°65′W, 44°19′ N), Canada, in the summer of 1993. The mid-day CO2 flux from the forest under clear sky conditions was around −1.0 mg m−2


Journal: Agricultural And Forest Meteorology, Volume 81 (1-2): 13-29 (1996). DOI: 10.1016/0168-1923(95)02310-0 Sites: CA-Cbo