Publications

Publications Found: 1373

Factors Controlling Long- And Short-Term Sequestration Of Atmospheric CO2 In A Mid-Latitude Forest
Barford, C. C., Wofsy, S. C., Goulden, M. L., Munger, J. W., Pyle, E. H., Urbanski, S. P., Hutyra, L., Saleska, S. R., Fitzjarrald, D., Moore, K.

Net uptake of carbon dioxide (CO2) measured by eddy covariance in a 60- to 80-year-old forest averaged 2.0 ± 0.4 megagrams of carbon per hectare per year during 1993 to 2000, with interannual variations exceeding 50%. Biometry indicated storage of 1.6 ± 0.4 megagrams of carbon per hectare per year over 8 years, 60% in …


Journal: Science, Volume 294 (5547): 1688-1691 (2001), ISBN . DOI: 10.1126/science.1062962 Sites: US-Ha1

Groundwater Flow Patterns In A Large Peatland
Fraser, C., Roulet, N., Lafleur, M.

Groundwater flow patterns and geochemistry were studied in the Mer Bleue bog, near Ottawa, Ontario, Canada. Groundwater flow patterns alternated between recharge, i.e. head gradients producing flow from the surface of the peatland to the deeper peat, and discharge, i.e. head gradients indicating flow from the deeper peat …


Journal: Journal Of Hydrology, Volume 246 (1-4): 142-154 (2001), ISBN . DOI: 10.1016/s0022-1694(01)00362-6 Sites: CA-Mer

Transpiration In Response To Variation In Microclimate And Soil Moisture In Southeastern Deciduous Forests
Oren, R., Pataki, D. E.

Responses of forests to changes in environmental conditions reflect the integrated behavior of their constituent species. We investigated sap flux-scaled transpiration responses of two species prevalent in upland eastern hardwood forests,Journal: Oecologia, Volume 127 (4): 549-559 (2001), ISBN . DOI: 10.1007/s004420000622 Sites: US-Dk3


Environmental Controls On Ground Cover Species Composition And Productivity In A Boreal Black Spruce Forest
Bisbee, K., Gower, S., Norman, J., Nordheim, E.

Boreal black spruce forests typically have a dense ground cover of bryophytes. The two main bryophyte groups in boreal black spruce forests, feathermoss and Sphagnum, have ecophysiological characteristics that influence …


Journal: Oecologia, Volume 129 (2): 261-270 (2001), ISBN . DOI: 10.1007/s004420100719 Sites: CA-Obs

Paired-Tower Measurements Of Carbon And Energy Fluxes Following Disturbance In The Boreal Forest
Amiro, B. D.

Disturbances by fire and harvesting are thought to regulate the carbon balance of the Canadian boreal forest over scales of several decades. However, there are few direct measurements …


Journal: Global Change Biology, Volume 7 (3): 253-268 (2001), ISBN . DOI: 10.1046/j.1365-2486.2001.00398.x Sites: CA-SF2, CA-SF3

Anthropogenic Emission Of Mercury To The Atmosphere In The Northeast United States
Lee, X., Bullock, O. R., Andres, R. J.

The severity and spatial extent of the health impact of anthropogenic mercury (Hg) emission to the atmosphere depend on the emission rate and chemical form of the emitted species. The few measurements of combustion flue gas give highly variable results about how the emission is divided between the elemental (Hg°) and reactive forms …


Journal: Geophysical Research Letters, Volume 28 (7): 1231-1234 (2001), ISBN . DOI: 10.1029/2000gl012274 Sites: US-GMF

Leaf Age Affects The Seasonal Pattern Of Photosynthetic Capacityand Net Ecosystem Exchange Of Carbon In A Deciduous Forest
Wilson, K. B., Baldocchi, D. D., Hanson, P. J.

Temporal trends in photosynthetic capacity are a critical factorin determining the seasonality and magnitude of ecosystem carbonfluxes. At a mixed deciduous forest in the south-eastern United States (Walker Branch Watershed, Oak Ridge, TN, USA), we independently measured seasonal trends in photosynthetic capacity (using single-leaf …


Journal: Plant, Cell And Environment, Volume 24 (6): 571-583 (2001), ISBN . DOI: 10.1046/j.0016-8025.2001.00706.x Sites: US-WBW

Quantifying The Complexity In Mapping Energy Inputs And Hydrologic State Variables Into Land-Surface Fluxes
Katul, G. G., Lai, C., Albertson, J. D., Vidakovic, B., Schäfer, K. V., Hsieh, C., Oren, R.

This study explores the complexity (or disorder) in mapping energy (Rn) forcing to land surface fluxes of sensible heat (Hs), water vapor (LE), and carbon dioxide (or net ecosystem exchange, NEE) for different soil water states (θ). Specifically, we ask, does the vegetation …


Journal: Geophysical Research Letters, Volume 28 (17): 3305-3307 (2001), ISBN . DOI: 10.1029/2000gl012154 Sites: US-Dk3

Prairie Growth, PAR Albedo And Seasonal Distribution Of Energy Fluxes
Burba, G. G., Verma, S. B.

Year-round measurements of surface energy fluxes, supporting meteorological parameters, soil moisture, and leaf foliage area were made at a tallgrass prairie site in north-central Oklahoma. Here we present the results of the first year (August 1996 to early September 1997) …


Journal: Agricultural And Forest Meteorology, Volume 107 (3): 227-240 (2001), ISBN . DOI: 10.1016/s0168-1923(00)00233-1 Sites: US-Shd

Ecosystem Respiration In A Young Ponderosa Pine Plantation In The Sierra Nevada Mountains, California
Xu, M., DeBiase, T. A., Qi, Y., Goldstein, A., Liu, Z.
We estimated total ecosystem respiration from a ponderosa pine (Pinus ponderosa Dougl. ex Laws.) plantation in the Sierra Nevada Mountains near Georgetown, California, from June to October, 1998. We apportioned ecosystem respiration among heterotrophic, root, stem and foliage based on relationships …


Journal: Tree Physiology, Volume 21 (5): 309-318 (2001), ISBN . DOI: 10.1093/treephys/21.5.309 Sites: US-Blo