Publications

Publications Found: 1437

Effects Of Climate Variability On Carbon Sequestration Among Adjacent Wet Sedge Tundra And Moist Tussock Tundra Ecosystems
Kwon, H.J., Oechel, W.C., Zulueta, R.C., Hastings, S.J.

Temporal and spatial variability in the Arctic introduces considerable uncertainty in the estimation of the current carbon budget and Arctic ecosystem response to climate change. Few representative measurements are available for land-surface parameterization of the Arctic tundra in regional and global climate models. In this study, …


Journal: Journal Of Geophysical Research: Biogeosciences, Volume 111 (G3): 2005-2012 (2005). DOI: 10.1029/2005JG000036 Sites: US-Atq, US-Brw

Modeling Gross Primary Production Of An Evergreen Needleleaf Forest Using Modis And Climate Data
Xiao, X., Zhang, Q., Hollinger, D., Aber, J., Moore, B.

Forest canopies are composed of photosynthetically active vegetation (PAV, chloroplasts) and nonphotosynthetic vegetation (NPV, e.g., cell wall, vein, branch). The fraction of photosynthetically active radiation …


Journal: Ecological Applications, Volume 15 (3): 954-969 (2005). DOI: 10.1890/04-0470 Sites: US-Ho1, US-Ho2, US-Ho3

Ecosystem And Understory Water And Energy Exchange For A Mature, Naturally Regenerated Pine Flatwoods Forest In North Florida
Powell, T. L., Starr, G., Clark, K. L., Martin, T. A., Gholz, H. L.

Eddy covariance was used to measure energy fluxes from July 2000 – June 2002 above the tree canopy and above the understory in a mature, naturally regenerated slash pine (Pinus elliottii Engelm. var. elliottii) – longleaf pine (Pinus palustris Mill.) flatwoods forest. Understory latent energy (λE) …


Journal: Canadian Journal Of Forest Research, Volume 35 (7): 1568-1580 (2005). DOI: 10.1139/x05-075 Sites: US-SP1

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

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

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

Diurnal, Seasonal And Annual Variation In The Net Ecosystem CO2 Exchange Of A Desert Shrub Community (Sarcocaulescent) In Baja California, Mexico
Hastings, S. J., Oechel, W. C., Muhlia-Melo, A.

Estimates of net ecosystem exchange (NEE) of CO2 have been measured on a variety of ecosystems world wide including grasslands, savannahs, boreal, pine, deciduous, Mediterranean and tropical rain forests as well as arctic tundra. While there have been numerous comparisons between net primary productivity of arid and semiarid grasslands …


Journal: Global Change Biology, Volume 11 (6): 927-939 (2005). DOI: 10.1111/j.1365-2486.2005.00951.x Sites: MX-Lpa

Foliage Shedding In Deciduous Forests Lifts Up Long-Distance Seed Dispersal By Wind
Nathan, R., Katul, G. G.

Seed terminal velocity and release height are recognized as key biotic determinants of long-distance dispersal (LDD) of seeds by wind. Yet, potential determinants at the ecosystem level, such as seasonal dynamics in foliage density characterizing many deciduous forests, have received much less attention. We integrated detailed field …


Journal: Proceedings Of The National Academy Of Sciences, Volume 102 (23): 8251-8256 (2005). DOI: 10.1073/pnas.0503048102 Sites: US-Dk3