Publications

Publications Found: 1437

An Evaluation Of Models For Partitioning Eddy Covariance-Measured Net Ecosystem Exchange Into Photosynthesis And Respiration
Stoy, P. C., Katul, G. G., Siqueira, M. B., Juang, J., Novick, K. A., Uebelherr, J. M., Oren, R.

We measured net ecosystem CO2 exchange (NEE) using the eddy covariance (EC) technique for 4 years at adjoining old field (OF), planted pine (PP) and hardwood forest (HW) ecosystems in the Duke Forest, NC. To compute annual sums of NEE and its components – gross …


Journal: Agricultural And Forest Meteorology, Volume 141 (1): 2-18 (2006). DOI: 10.1016/j.agrformet.2006.09.001 Sites: US-Dk3

Estimating The Uncertainty In Annual Net Ecosystem Carbon Exchange: Spatial Variation In Turbulent Fluxes And Sampling Errors In Eddy-Covariance Measurements
Oren, R., Hsieh, C., Stoy, P., Albertson, J., Mccarthy, H. R., Harrell, P., Katul, G. G.

Above forest canopies, eddy covariance (EC) measurements of mass (CO2, H2O vapor) and energy exchange, assumed to represent ecosystem fluxes, are commonly …


Journal: Global Change Biology, Volume 12 (5): 883-896 (2006). DOI: 10.1111/j.1365-2486.2006.01131.x Sites: US-Dk1, US-Dk2, US-Dk3

Modeling Evapotranspiration In Arctic Coastal Plain Ecosystems Using A Modified BIOME-BGC Model
Engstrom, R., Hope, A., Kwon, H., Harazono, Y., Mano, M., Oechel, W.

Modeling evapotranspiration (ET) in Arctic coastal plain ecosystems is challenging owing to the unique conditions present in this environment, including permafrost, nonvascular vegetation, and a large standing dead vegetation component. In this study the ecosystem process model, BIOME-BGC, was adapted to represent these unique conditions …


Journal: Journal Of Geophysical Research: Biogeosciences, Volume 111 (G02021): n/a-n/a (2006). DOI: 10.1029/2005JG000102 Sites: US-Brw

Above- And Belowground Ecosystem Biomass And Carbon Pools In An Age-Sequence Of Temperate Pine Plantation Forests
Peichl, M., Arain, M. A.

We assessed the successional development of above- and belowground ecosystem biomass and carbon (C) pools in an age-sequence of four White pine (Pinus strobus L.) plantation stands (2-, 15-, 30-, and 65-years-old) in Southern Ontario, Canada. Biomass and C stocks of above- and belowground live and dead tree biomass, understorey …


Journal: Agricultural And Forest Meteorology, Volume 140 (1-4): 51-63 (2006). DOI: 10.1016/j.agrformet.2006.08.004 Sites: CA-TP1, CA-TP2, CA-TP3, CA-TP4

Leaf Area Index Measurements At Fluxnet-Canada Forest Sites
Chen, J. M., Govind, A., Sonnentag, O., Zhang, Y., Barr, A., Amiro, B.

Leaf area index (LAI) measurements made at 17 forest sites of the Fluxnet Canada Research Network are reported here. In addition to LAI, we also report other major structural parameters including the effective LAI, element clumping index, needle-to-shoot area ratio, and …


Journal: Agricultural And Forest Meteorology, Volume 140 (1-4): 257-268 (2006). DOI: 10.1016/j.agrformet.2006.08.005 Sites: CA-Ca2, CA-Ca3, CA-Gro, CA-Na1, CA-Oas, CA-Ojp, CA-Qfo, CA-SJ1, CA-SJ3, CA-TP2, CA-TP3, CA-TP4

Ecosystem-Level CO2 Fluxes From A Boreal Cutover In Eastern Canada Before And After Scarification
Giasson, M., Coursolle, C., Margolis, H. A.

Carbon (C) cycling in the boreal forest is driven by both natural and human disturbances, but there is little information on the impact of forest management practices on ecosystem-level C balance. We evaluated the C balance of a recently harvested boreal site in eastern …


Journal: Agricultural And Forest Meteorology, Volume 140 (1-4): 23-40 (2006). DOI: 10.1016/j.agrformet.2006.08.001 Sites: CA-Qcu

Influences Of Biomass Heat And Biochemical Energy Storages On The Land Surface Fluxes And Radiative Temperature
Gu, L., Meyers, T., Pallardy, S. G., Hanson, P. J., Yang, B., Heuer, M., Hosman, K. P., Liu, Q., Riggs, J. S., Sluss, D., Wullschleger, S. D.

The interest of this study was to develop an initial assessment on the potential importance of biomass heat and biochemical energy storages for land-atmosphere interactions, an issue that has been largely neglected so far. We conducted flux tower observations and model simulations at a temperate deciduous forest site in central Missouri …


Journal: Journal Of Geophysical Research: Atmospheres, Volume 112 (D2): n/a-n/a (2006). DOI: 10.1029/2006jd007425 Sites: US-MOz

Canopy Leaf Area Constrains [Co2]-Induced Enhancement Of Productivity And Partitioning Among Aboveground Carbon Pools
McCarthy, H. R., Oren, R., Finzi, A. C., Johnsen, K. H.

Net primary productivity (NPP) is enhanced under future atmospheric [CO2] in temperate forests representing a broad range of productivity. Yet questions remain in regard to how elevated [CO2]-induced NPP enhancement may be affected by climatic variations and limiting nutrient resources, as well as how this additional …


Journal: Proceedings Of The National Academy Of Sciences, Volume 103 (51): 19356-19361 (2006). DOI: 10.1073/pnas.0609448103 Sites: US-Dk3

Multiscale Model Intercomparisons Of CO2 And H2O Exchange Rates In A Maturing Southeastern US Pine Forest
Siqueira, M. B., Katul, G. G., Sampson, D. A., Stoy, P. C., Juang, J., Mccarthy, H. R., Oren, R.

We compared four existing process-based stand-level models of varying complexity (physiological principles in predicting growth, photosynthesis and evapotranspiration, biogeochemical …


Journal: Global Change Biology, Volume 12 (7): 1189-1207 (2006). DOI: 10.1111/j.1365-2486.2006.01158.x Sites: US-Dk2

Comparison Of Ecosystem Water-Use Efficiency Among Douglas-Fir Forest, Aspen Forest And Grassland Using Eddy Covariance And Carbon Isotope Techniques
Ponton, S., Flanagan, L. B., Alstad, K. P., Johnson, B. G., Morgenstern, K., Kljun, N., Black, T. A., Barr, A. G.

Comparisons were made among Douglas-fir forest, aspen (broad leaf deciduous) forest and wheatgrass (C3) grassland for ecosystem-level water-use efficiency (WUE). WUE was defined as the ratio of photosynthetic CO2 assimilation rate and evapotranspiration (ET) rate. The ET data measured by eddy covariance were …


Journal: Global Change Biology, Volume 12 (2): 294-310 (2006). DOI: 10.1111/j.1365-2486.2005.01103.x Sites: CA-Ca1, CA-Let, CA-Oas