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Publications Found: 1373

Diel And Seasonal Patterns Of Tropical Forest CO2 Exchange
Goulden, M. L., Miller, S. D., da Rocha, H. R., Menton, M. C., de Freitas, H. C., e Silva Figueira, A. M., de Sousa, C. A.

We used eddy covariance to measure the net exchange of CO₂ between the atmosphere and an old-growth tropical forest in Pará, Brazil from 1 July 2000 to 1 July 2001. The mean air temperature and …

Journal: Ecological Applications, Volume 14 (sp4): 42-54 (2004), ISBN . DOI: 10.1890/02-6008 Sites: BR-Sa3

Carbon Dioxide Exchange Between An Old-Growth Forest And The Atmosphere
Paw U, K., Falk, M., Suchanek, T., Ustin, S., Chen, J., Park, Y., Winner, W., Thomas, S., Hsiao, T., Shaw, R., King, T., Pyles, R., Schroeder, M., Matista, A.

Eddy-covariance and biometeorological methods show significant net annual carbon uptake in an old-growth Douglas-fir forest in southwestern Washington, USA. These results contrast with previous assumptions that old-growth forest ecosystems are in carbon …

Journal: Ecosystems, Volume 7 (5): 513-524 (2004), ISBN . DOI: 10.1007/s10021-004-0141-8 Sites: US-Wrc

Spatial And Temporal Variability In Forest-Atmosphere CO2 Exchange
Hollinger, D. Y., Aber, J., Dail, B., Davidson, E. A., Goltz, S. M., Hughes, H., Leclerc, M. Y., Lee, J. T., Richardson, A. D., Rodrigues, C., Scott, N., Achuatavarier, D., Walsh, J.

Seven years of carbon dioxide flux measurements indicate that a ∼90-year-old spruce dominated forest in Maine, USA, has been sequestering 174±46 g C m⁻² yr⁻¹ (mean±1 standard deviation, nocturnal friction velocity (u_*) threshold >0.25 m s⁻¹). An analysis of monthly …

Journal: Global Change Biology, Volume 10 (10): 1689-1706 (2004), ISBN . DOI: 10.1111/j.1365-2486.2004.00847.x Sites: US-Ho1

Monitoring Forest Carbon Sequestration With Remote Sensing And Carbon Cycle Modeling
Turner, D. P., Guzy, M., Lefsky, M. A., Ritts, W. D., Van Tuyl, S., Law, B. E.

Sources and sinks of carbon associated with forests depend strongly on the management regime and spatial patterns in potential productivity. Satellite remote sensing can provide spatially explicit information on land cover, stand-age class, and harvesting. …

Journal: Environmental Management, Volume 33 (4): 457-466 (2004), ISBN . DOI: 10.1007/s00267-003-9103-8 Sites: US-Me4, US-Me5

Observing Subcanopy CO2 Advection
Staebler, R. M., Fitzjarrald, D. R.

Underestimation of nocturnal CO₂ respiration under calm conditions remains an unsolved problem at many forest flux stations. In this paper, the hypothesis is tested that horizontal mean transport, not previously measured, may account for the missing CO₂. A systematic methodology was developed that comprises …

Journal: Agricultural And Forest Meteorology, Volume 122 (3-4): 139-156 (2004), ISBN . DOI: 10.1016/j.agrformet.2003.09.011 Sites: US-Ha1

A Model For Scalar Advection Inside Canopies And Application To Footprint Investigation
Lee, X.

In this paper, a model is presented for scalar advection inside canopies. A key result is an advection/diffusion equation that captures the persistence effect of the diffusion plume from elevated sources through a near-field modifier. The model is applicable to various source configurations including line source, plane and …

Journal: Agricultural And Forest Meteorology, Volume 127 (3-4): 131-141 (2004), ISBN . DOI: 10.1016/j.agrformet.2004.07.009 Sites: US-GMF

Heat Storage And Energy Balance Fluxes For A Temperate Deciduous Forest
Oliphant, A., Grimmond, C., Zutter, H., Schmid, H., Su, H., Scott, S., Offerle, B., Randolph, J., Ehman, J.

Hourly observations of forest-atmosphere energy balance components are presented for the Morgan-Monroe State Forest, south-central Indiana, USA for the period March 1998 to December 2001, with particular emphasis on the storage heat flux (ΔQ_S). The sub-components of ΔQ_S showed strong diurnal …

Journal: Agricultural And Forest Meteorology, Volume 126 (3-4): 185-201 (2004), ISBN . DOI: 10.1016/j.agrformet.2004.07.003 Sites: US-MMS

Ecosystem Response To 15 Years Of Chronic Nitrogen Additions At The Harvard Forest LTER, Massachusetts, USA
Magill, A. H., Aber, J. D., Currie, W. S., Nadelhoffer, K. J., Martin, M. E., McDowell, W. H., Melillo, J. M., Steudler, P.

Humans have altered the global and regional cycles of nitrogen more than any other element. Alteration of N cycling patterns and processes in forests is one potentially negative outcome of accelerated N deposition worldwide. To assess potential impacts of N deposition on temperate forests, a series of chronic nitrogen additions …

Journal: Forest Ecology And Management, Volume 196 (1): 7-28 (2004), ISBN . DOI: 10.1016/j.foreco.2004.03.033 Sites: US-Ha2, US-LPH

Age-Related Changes In Ecosystem Structure And Function And Effects On Water And Carbon Exchange In Ponderosa Pine
Irvine, J., Law, B. E., Kurpius, M. R., Anthoni, P. M., Moore, D., Schwarz, P. A.

As forests age, their structure and productivity change, yet in some cases, annual rates of water loss remain unchanged. To identify mechanisms that might explain such observations, and to determine if widely different age classes of forests differ functionally, we examined young (Y, 25 years), mature (M, 90 years) …

Journal: Tree Physiology, Volume 24 (7): 753-763 (2004), ISBN . DOI: 10.1093/treephys/24.7.753 Sites: US-Me2

Associations Between Carbon Isotope Ratios Of Ecosystem Respiration, Water Availability And Canopy Conductance
McDowell, N. G., Bowling, D. R., Schauer, A., Irvine, J., Bond, B. J., Law, B. E., Ehleringer, J. R.

We tested the hypothesis that the stable carbon isotope signature of ecosystem respiration (δ¹³C_R) was regulated by canopy conductance (G_c) using weekly Keeling plots (n=51) from a semiarid old-growth ponderosa pine (Pinus ponderosa) forest in Oregon, USA. For …

Journal: Global Change Biology, Volume 10 (10): 1767-1784 (2004), ISBN . DOI: 10.1111/j.1365-2486.2004.00837.x Sites: US-Blo, US-Me4

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