Publications

Publications Found: 1437

Effects Of Forest Harvesting On Soil Methane Fluxes In Florida Slash Pine Plantations
Castro, M. S., Gholz, H. L., Clark, K. L., Steudler, P. A.

We examined the effects of forest harvesting on the net exchange of methane (CH4) between the atmosphere and sandy soils in two mature slash pine (Pinus elliottii Engelm. var. elliottii) plantations in northern Florida. Before each of the stem-only harvests, soils in these plantations were net sinks for CH4


Journal: Canadian Journal Of Forest Research, Volume 30 (10): 1534-1542 (2000). DOI: 10.1139/cjfr-30-10-1534 Sites: US-SP1, US-SP2, US-SP3, US-SP4

Measuring And Modelling Seasonal Variation Of Carbon Dioxide And Water Vapour Exchange Of A Pinus Ponderosa Forest Subject To Soil Water Deficit
Law, B. E., Williams, M., Anthoni, P. M., Baldocchi, D. D., Unsworth, M. H.

We conducted ecosystem carbon and water vapour exchange studies in an old-growth Pinus ponderosaforest in the Pacific North-west region of the United States. The canopy is heterogeneous, with tall multiaged trees and an open, clumped canopy with low leaf area. Carbon assimilation can occur throughout relatively mild winters, …


Journal: Global Change Biology, Volume 6 (6): 613-630 (2000). DOI: 10.1046/j.1365-2486.2000.00339.x Sites: US-Me5

Estimating Watershed Evapotranspiration With Pass. Part I: Inferring Root-Zone Moisture Conditions Using Satellite Data
Song, J., Wesely, M. L., Coulter, R. L., Brandes, E. A.

A model framework for parameterized subgrid-scale surface fluxes (PASS) has been modified and applied as PASS1 to use satellite data, models, and limited surface observations to infer root-zone available moisture (RAM) content with high spatial resolution over large terrestrial areas. Data collected during the 1997 Cooperative Atmosphere–Surface …


Journal: Journal Of Hydrometeorology, Volume 1 (5): 447-461 (2000). DOI: 10.1175/1525-7541(2000)001<0447:EWEWPP>2.0.CO;2 Sites: US-Wlr

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

Summer Differences Among Arctic Ecosystems In Regional Climate Forcing
Chapin, F. S., Eugster, W., McFadden, J. P., Lynch, A. H., Walker, D. A.

Biome differences in surface energy balance strongly affect climate. However, arctic vegetation is considered sufficiently uniform that only a single arctic land surface type is generally used in climate models. Field measurements in northern Alaska show large differences among arctic ecosystem types in summer energy absorption and …


Journal: Journal Of Climate, Volume 13 (12): 2002-2010 (2000). DOI: 10.1175/1520-0442(2000)013<2002:SDAAEI>2.0.CO;2 Sites: US-Upa

Effect Of Daily Minimum Temperature On Photosynthesis In Eastern Hemlock (Tsuga Canadensis L.) In Autumn And Winter
Hadley, J. L.


Journal: Arctic, Antarctic, And Alpine Research, Volume 32 (4): 368-374 (2000). DOI: 10.2307/1552384 Sites: US-Ha2

Factors Controlling Evaporation And Energy Partitioning Beneath A Deciduous Forest Over An Annual Cycle
Wilson, K. B., Hanson, P. J., Baldocchi, D. D.

The energy balance components were measured above the ground surface of a temperate deciduous forest over an annual cycle using the eddy covariance technique. Over a year, the net radiation at the forest floor was 21.5% of that above the canopy, but this proportion was not constant, primarily because of the distinct phenological …


Journal: Agricultural And Forest Meteorology, Volume 102 (2-3): 83-103 (2000). DOI: 10.1016/s0168-1923(00)00124-6 Sites: US-WBW

Nocturnal Mixing In A Forest Subcanopy
Mahrt, L., Lee, X., Black, A., Neumann, H., Staebler, R.

The vertical structure of the flow in the old aspen canopy in BOREAS is examined in terms of thermocouple profiles and sonic anemometers above, within, and below the aspen canopy. The data are composited for different periods in order to isolate seasonal changes of the canopy and sun angle. On clear nights, a strong surface …


Journal: Agricultural And Forest Meteorology, Volume 101 (1): 67-78 (2000). DOI: 10.1016/s0168-1923(99)00161-6 Sites: CA-Oas

Estimating CO2 Flux From Snowpacks At Three Sites In The Rocky Mountains
McDowell, N. G., Marshall, J. D., Hooker, T. D., Musselman, R.
Soil surface CO2 flux (Fs) is the dominant respiratory flux in many temperate forest ecosystems. Snowpacks increase this dominance by insulating the soil against the low temperature to which aboveground components are exposed. However, measurement of Fs


Journal: Tree Physiology, Volume 20 (11): 745-753 (2000). DOI: 10.1093/treephys/20.11.745 Sites: US-GLE

Wintertime Ozone Fluxes And Profiles Above A Subalpine Spruce–Fir Forest
Zeller, K.

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


Journal: Journal Of Applied Meteorology, Volume 39 (1): 92-101 (2000). DOI: 10.1175/1520-0450(2000)039<0092:WOFAPA>2.0.CO;2 Sites: US-GBT