Publications

Publications Found: 1437

Extensive Observations Of Co2carbon Isotope Content In And Above A High-Elevation Subalpine Forest
Bowling, D. R., Burns, S. P., Conway, T. J., Monson, R. K., White, J. W.

The dynamics of forest-atmosphere CO2 carbon isotope exchange were examined in a coniferous forest in Colorado, United States. Tunable diode laser absorption spectrometry provided extensive characterization of the carbon isotope content (δ13C) of CO2. Observed patterns in δ13C of forest …


Journal: Global Biogeochemical Cycles, Volume 19 (3): n/a-n/a (2005). DOI: 10.1029/2004gb002394 Sites: US-NR1

Spatial–Temporal Variation In Soil Respiration In An Oak–Grass Savanna Ecosystem In California And Its Partitioning Into Autotrophic And Heterotrophic Components
Tang, J., Baldocchi, D. D.

The spatial upscaling of soil respiration from field measurements to ecosystem levels will be biased without studying its spatial variation. We took advantage of the unique spatial gradients of an oak–grass savanna ecosystem in California, with widely spaced oak trees overlying a grass layer, to study the spatial variation in soil …


Journal: Biogeochemistry, Volume 73 (1): 183-207 (2005). DOI: 10.1007/s10533-004-5889-6 Sites: US-Ton

An Analysis Of Soil Respiration Across Northern Hemisphere Temperate Ecosystems
Hibbard, K. A., Law, B. E., Reichstein, M., Sulzman, J.

Over two-thirds of terrestrial carbon is stored belowground and a significant amount of atmospheric CO2 is respired by roots and microbes in soils. For this analysis, soil respiration (Rs) data were assembled from 31 AmeriFlux and CarboEurope sites representing deciduous broadleaf, evergreen needleleaf, grasslands, mixed …


Journal: Biogeochemistry, Volume 73 (1): 29-70 (2005). DOI: 10.1007/s10533-004-2946-0 Sites: US-Dk3, US-Ho1, US-Me2, US-Me4, US-Me5, US-NR1, US-Ton, US-UMB, US-WCr

Effects Of Elevated Atmospheric CO2 On Soil Microbial Biomass, Activity, And Diversity In A Chaparral Ecosystem
Lipson, D. A., Wilson, R. F., Oechel, W. C.

This study reports the effects of long-term elevated atmospheric CO2 on root production and microbial activity, biomass, and diversity in a chaparral ecosystem in southern California. The free air CO2 enrichment (FACE) ring was located in a stand dominated by the woody shrub Adenostoma fasciculatum. …


Journal: Applied And Environmental Microbiology, Volume 71 (12): 8573-8580 (2005). DOI: 10.1128/aem.71.12.8573-8580.2005 Sites: US-SO2, US-SO3

Importance Of Changing CO2, Temperature, Precipitation, And Ozone On Carbon And Water Cycles Of An Upland-Oak Forest: Incorporating Experimental Results Into Model Simulations
Hanson, P. J., Wullschleger, S. D., Norby, R. J., Tschaplinski, T. J., Gunderson, C. A.

Observed responses of upland-oak vegetation of the eastern deciduous hardwood forest to changing CO2, temperature, precipitation and tropospheric ozone (O3) were derived from field studies and interpreted with a stand-level model for an 11-year range of environmental variation upon which scenarios of future …


Journal: Global Change Biology, Volume 11 (9): 1402-1423 (2005). DOI: 10.1111/j.1365-2486.2005.00991.x Sites: US-WBW

Potential Of MODIS Ocean Bands For Estimating CO2flux From Terrestrial Vegetation: A Novel Approach
Rahman, A. F., Cordova, V. D., Gamon, J. A., Schmid, H. P., Sims, D. A.

A physiologically-driven spectral index using two ocean-color bands of MODIS satellite sensor showed great potential to track seasonally changing photosynthetic light use efficiency (LUE) and stress-induced reduction in net primary productivity (NPP) of terrestrial vegetation. Based on these findings, we developed a simple “continuous …


Journal: Geophysical Research Letters, Volume 31 (10): n/a-n/a (2004). DOI: 10.1029/2004gl019778 Sites: US-MMS

Climatic Versus Biotic Constraints On Carbon And Water Fluxes In Seasonally Drought-Affected Ponderosa Pine Ecosystems
Schwarz, P. A., Law, B. E., Williams, M., Irvine, J., Kurpius, M., Moore, D.

We investigated the relative importance of climatic versus biotic controls on gross primary production (GPP) and water vapor fluxes in seasonally drought-affected ponderosa pine forests. The study was conducted in young (YS), mature (MS), and old stands (OS) over 4 years at the AmeriFlux Metolius sites. Model simulations showed that …


Journal: Global Biogeochemical Cycles, Volume 18 (GB4007): n/a-n/a (2004). DOI: 10.1029/2004GB002234 Sites: US-Me2, US-Me4, US-Me5

Observed Covariance Between Ecosystem Carbon Exchange And Atmospheric Boundary Layer Dynamics At A Site In Northern Wisconsin
Yi, C., Davis, K. J., Bakwin, P. S., Denning, A. S., Zhang, N., Desai, A., Lin, J. C., Gerbig, C.

Ecosystem CO2 exchange and atmosphere boundary layer (ABL) mixing are correlated diurnally and seasonally as they are both driven by solar insulation. Tracer transport models predict that these covariance signals produce a meridional gradient of annual mean CO2 concentration in the marine boundary layer that …


Journal: Journal Of Geophysical Research: Atmospheres, Volume 109 (D8): n/a-n/a (2004). DOI: 10.1029/2003jd004164 Sites: US-Los, US-PFa, US-WCr

Regional Carbon Dioxide Fluxes From Mixing Ratio Data
Bakwin, P. S., Davis, K. J., Yi, C., Wofsy, S. C., Munger, J. W., Haszpra, L., Barcza, Z.

We examine the atmospheric budget of CO2 at temperate continental sites in the Northern Hemisphere. On a monthly time scale both surface exchange and atmospheric transport are important in determining the rate of change of CO2 mixing ratio at these sites. Vertical differences between the atmospheric boundary …


Journal: Tellus Series B-Chemical and Physical Meteorology, Volume 56 (4): 301-311 (2004). DOI: 10.3402/tellusb.v56i4.16446 Sites: CA-Man, US-Los, US-PFa, US-WCr

Effects Of Meteorological Variations On The CO2 Exchange Of A Brazilian Transitional Tropical Forest
Vourlitis, G. L., Priante Filho, N., Hayashi, M. M., Nogueira, J. d., Raiter, F., Hoegel, W., Campelo, Jr, J. H.

The net ecosystem CO2 exchange (NEE) of a 28–30 m tall transitional (ecotonal) tropical forest of the Brazilian Amazon was quantified using tower-based eddy covariance. Measurements were made …


Journal: Ecological Applications, Volume 14 (sp4): 89-100 (2004). DOI: 10.1890/01-6005 Sites: BR-Sa1, BR-Sa3