Publications

Publications Found: 1437

Seasonal Dynamics And Partitioning Of Isotopic CO2 Exchange In A C3/C4 Managed Ecosystem
Griffis, T., Baker, J., Zhang, J.

Ecosystem-atmosphere fluxes of 12CO2 and 13CO2 are needed to better understand the impacts of climate and land use change on ecosystem respiration (FR), net ecosystem CO2 exchange (FN), …


Journal: Agricultural And Forest Meteorology, Volume 132 (1-2): 1-19 (2005). DOI: 10.1016/j.agrformet.2005.06.005 Sites: US-Ro1

Is soil respiration a major contributor to the carbon budget within a Pacific Northwest old-growth forest?
Falk, M., Paw U, K.T., Wharton, S., Schroeder, M.

Carbon dioxide (CO2) exchange was measured above the forest floor of a temperate Douglas-fir (Pseudotsuga menziesii (Mirbel)
Franco) and Western Hemlock (Tsuga heterophylla (Raf.) Sarg.) old-growth forest in southern Washington State. Continuous flux
measurements were conducted from July 1998 to December 2003 using the eddy-covariance …


Journal: Agricultural and Forest Meteorology, Volume 135: 269-283 (2005). DOI: Sites: US-Wrc

Modeling Soil CO2 Emissions From Ecosystems
Del Grosso, S., Parton, W., Mosier, A., Holland, E., Pendall, E., Schimel, D., Ojima, D.

We present a new soil respiration model, describe a formal model testing procedure, and compare our model with five alternative models using an extensive data set of observed soil respiration. Gas flux data from rangeland soils that included a large number of measurements at low temperatures were used to model soil CO2


Journal: Biogeochemistry, Volume 73 (1): 71-91 (2005). DOI: 10.1007/s10533-004-0898-z Sites: US-GLE

Modelling CO2 And Energy Exchanges In A Northern Semiarid Grassland Using The Carbon- And Nitrogen-Coupled Canadian Land Surface Scheme (C-CLASS)
Zhang, Y., Grant, R., Flanagan, L., Wang, S., Verseghy, D.

The development of carbon (C) and nitrogen (N) simulations is one of the ongoing efforts in the land surface schemes of climate models. The C- and N-coupled Canadian Land Surface Scheme (C-CLASS) was recently modified to better represent grassland ecosystems. Improvements include revised plant growth and senescence calculations that …


Journal: Ecological Modelling, Volume 181 (4): 591-614 (2005). DOI: 10.1016/j.ecolmodel.2004.07.007 Sites: CA-Let

Forest Thinning And Soil Respiration In A Ponderosa Pine Plantation In The Sierra Nevada
Tang, J., Qi, Y., Xu, M., Misson, L., Goldstein, A. H.

Soil respiration is controlled by soil temperature, soil water, fine roots, microbial activity, and soil physical and chemical properties. Forest thinning changes soil temperature, soil water content, and root density and activity, and thus changes soil respiration. We measured soil respiration monthly and soil temperature and volumetric …


Journal: Tree Physiology, Volume 25 (1): 57-66 (2005). DOI: 10.1093/treephys/25.1.57 Sites: US-Blo

Forest Soil Respiration Across Three Climatically Distinct Chronosequences In Oregon
Campbell, J., Law, B.

To assess the relative influence of edaphoclimatic gradients and stand replacing disturbance on the soil respiration of Oregon forests, we measured annual soil respiration at 36 independent forest plots arranged as three replicates of four age classes in …


Journal: Biogeochemistry, Volume 73 (1): 109-125 (2005). DOI: 10.1007/s10533-004-5165-9 Sites: US-Me2, US-Me3, US-Me4, US-Me5

Net Ecosystem Production In A Temperate Pine Plantation In Southeastern Canada
Arain, M. A., Restrepo-Coupe, N.

Eddy covariance measurements of carbon dioxide (CO2) and water vapour fluxes were made from June 2002 to May 2003 over a 65-year-old temperate conifer plantation forest in southern Ontario, Canada. This site is part of a newly initiated long-term tower flux measurement …


Journal: Agricultural And Forest Meteorology, Volume 128 (3-4): 223-241 (2005). DOI: 10.1016/j.agrformet.2004.10.003 Sites: CA-Ca1, CA-TP1, CA-TP2, CA-TP3, CA-TP4, US-Dk3, US-GLE, US-Ho1, US-Me4, US-Me5, US-NR1

Midday Values Of Gross CO2 Flux And Light Use Efficiency During Satellite Overpasses Can Be Used To Directly Estimate Eight-Day Mean Flux
Sims, D. A., Rahman, A. F., Cordova, V. D., Baldocchi, D. D., Flanagan, L. B., Goldstein, A. H., Hollinger, D. Y., Misson, L., Monson, R. K., Schmid, H. P., Wofsy, S. C., Xu, L.

Most satellites provide, at best, a single daily snapshot of vegetation and, at worst, these snapshots may be separated by periods of many days when the ground was obscured by cloud cover. Since vegetation carbon exchange can be very dynamic on diurnal and day-to-day timescales, the limited temporal resolution of satellite data is …


Journal: Agricultural And Forest Meteorology, Volume 131 (1-2): 1-12 (2005). DOI: 10.1016/j.agrformet.2005.04.006 Sites: CA-Let, US-Blo, US-Ho1, US-MMS, US-NR1, US-Ton, US-Var

Changes In The Surface Energy Budget After Fire In Boreal Ecosystems Of Interior Alaska: An Annual Perspective
Liu, H., Randerson, J. T., Lindfors, J., Chapin, F. S.

Understanding links between the disturbance regime and regional climate in boreal regions requires observations of the surface energy budget from ecosystems in various stages of secondary succession. While several studies have characterized fire-induced differences in surface energy fluxes from boreal ecosystems during summer months, …


Journal: Journal Of Geophysical Research, Volume 110 (D13): n/a-n/a (2005). DOI: 10.1029/2004jd005158 Sites: US-Bn1, US-Bn2, US-Bn3

Assessing Bias In Evapotranspiration And Soil Moisture Estimates Due To The Use Of Modeled Solar Radiation And Dew Point Temperature Data
Mahmood, R., Hubbard, K. G.

Solar radiation and dew point temperature are important input variables for many crop growth ecological, hydrological, and meteorological models. It is also well known that solar radiation and dew point temperature (and relative humidity) data are not readily available for …


Journal: Agricultural And Forest Meteorology, Volume 130 (1-2): 71-84 (2005). DOI: 10.1016/j.agrformet.2005.02.004 Sites: US-Ne1, US-Ne2, US-Ne3