Publications

Publications Found: 1378

The Effects Of Elevated CO2 On Nutrient Distribution In A Fire-Adapted Scrub Oak Forest
Johnson, D. W., Hungate, B. A., Dijkstra, P., Hymus, G., Hinkle, C. R., Stiling, P., Drake, B. G.

Elevated carbon dioxide (CO2) caused greater accumulation of carbon (C) and nutrients in both vegetation and O horizons over a 5-yr sampling period in a scrub oak ecosystem in Florida. Elevated CO2 had no effect on any measured soil property except extractable phosphorus (P), which was lower with elevated CO2


Journal: Ecological Applications, Volume 13 (5): 1388-1399 (2003), ISBN . DOI: 10.1890/02-5139 Sites: US-KS2

Carbon Distribution Of A Well- And Poorly-Drained Black Spruce Fire Chronosequence
Wang, C., Bond-Lamberty, B., Gower, S. T.

The objective of this study was to quantify carbon (C) distribution for boreal black spruce (Picea mariana (Mill.) BSP) stands comprising a fire chronosequence in northern Manitoba, Canada. The experimental design included seven well-drained (dry) and seven poorly-drained (wet) stands that burned between 1998 and 1850. Vegetation …


Journal: Global Change Biology, Volume 9 (7): 1066-1079 (2003), ISBN . DOI: 10.1046/j.1365-2486.2003.00645.x Sites: CA-Man, CA-NS2, CA-NS3, CA-NS5, CA-NS6, CA-NS7

Diurnal Centroid Of Ecosystem Energy And Carbon Fluxes At FLUXNET Sites
Wilson, K. B., Baldocchi, D., Falge, E., Aubinet, M., Berbigier, P., Bernhofer, C., Dolman, H., Field, C., Goldstein, A., Granier, A., Hollinger, D., Katul, G., Law, B. E., Meyers, T., Moncrieff, J., Monson, R., Tenhunen, J., Valentini, R., Verma, S., Wofsy, S.

Data from a network of eddy covariance stations in Europe and North America (FLUXNET) were analyzed to examine the diurnal patterns of surface energy and carbon fluxes during the summer period across a range of ecosystems and climates. Diurnal trends were quantified by assessing the time of day surface fluxes and meteorological variable …


Journal: Journal Of Geophysical Research: Atmospheres, Volume 108 (D21): n/a-n/a (2003), ISBN . DOI: 10.1029/2001jd001349 Sites: US-Blo

Comparison Of Net Primary Production And Light-Use Dynamics Of Two Boreal Black Spruce Forest Communities
O'Connell, K. E., Gower, S. T., Norman, J. M.

Black spruce (Picea mariana [Mill.] BSP) is the most dominant forest ecosystem in the North American boreal region. There are at least two contrasting boreal black spruce forest communities: open-canopy black spruce overstory with Sphagnum ground cover (BSSP) and closed-canopy black spruce overstory with feathermoss ground cover …


Journal: Ecosystems, Volume 6 (3): 236-247 (2003), ISBN . DOI: 10.1007/pl00021510 Sites: CA-Obs

Remote Estimation Of Leaf Area Index And Green Leaf Biomass In Maize Canopies
Gitelson, A. A., Viña, A., Arkebauer, T. J., Rundquist, D. C., Keydan, G., Leavitt, B.

Leaf area index (LAI) is an important variable for climate modeling, estimates of primary production, agricultural yield forecasting, and many other diverse studies. Remote sensing provides a considerable potential for estimating LAI at local to regional and global scales. Several spectral vegetation indices have been proposed, but …


Journal: Geophysical Research Letters, Volume 30 (5): n/a-n/a (2003), ISBN . DOI: 10.1029/2002GL016450 Sites: US-Ne1

Oxygen Isotope Content Of CO2 in Nocturnal Ecosystem Respiration: 2. Short-Term Dynamics Of Foliar And Soil Component Fluxes In An Old-Growth Ponderosa Pine Forest
Bowling, D. R., McDowell, N. G., Welker, J. M., Bond, B. J., Law, B. E., Ehleringer, J. R.

The oxygen isotope contents (δ18O) of soil, xylem, and leaf water and ecosystem respiration were studied in a ponderosa pine forest during summer 2001. Our goal was to assess whether δ18O of CO2could be used to quantify the relative contributions of soil and foliar respiration to total nocturnal …


Journal: Global Biogeochemical Cycles, Volume 17 (4): n/a-n/a (2003), ISBN . DOI: 10.1029/2003gb002082 Sites: US-Me4

Meeting Cereal Demand While Protecting Natural Resources And Improving Environmental Quality
Cassman, K. G., Dobermann, A., Walters, D. T., Yang, H.

Agriculture is a resource-intensive enterprise. The manner in which food production systems utilize resources has a large influence on environmental quality. To evaluate prospects for conserving natural resources while meeting increased demand for cereals, we interpret recent trends and future trajectories in crop yields, land and …


Journal: Annual Review Of Environment And Resources, Volume 28 (1): 315-358 (2003), ISBN . DOI: 10.1146/annurev.energy.28.040202.122858 Sites: US-Ne2, US-Ne3

Elevated CO2 Lowers Relative And Absolute Herbivore Density Across All Species Of A Scrub-Oak Forest
Stiling, P., Moon, D., Hunter, M., Colson, J., Rossi, A., Hymus, G., Drake, B.

The unabated increase in global atmospheric CO2 is expected to induce physiological changes in plants, including reduced foliar nitrogen, which are likely to affect herbivore densities. This study employs a field-based CO2 enrichment experiment at Kennedy Space Center, Florida, to examine plant-herbivore (insect) …


Journal: Oecologia, Volume 134 (1): 82-87 (2003), ISBN . DOI: 10.1007/s00442-002-1075-5 Sites: US-KS2

Carbon Dioxide Fluxes In A Semiarid Environment With High Carbonate Soils
Emmerich, W. E.

Carbon dioxide is increasing in the atmosphere due to human activities. Over long time periods semiarid soils have sequestered inorganic carbon to accumulate the third largest global carbon pool. The hypothesis for this study was that these soils are maintaining this carbon pool under present climatic conditions and are a sink for …


Journal: Agricultural And Forest Meteorology, Volume 116 (1-2): 91-102 (2003), ISBN . DOI: 10.1016/s0168-1923(02)00231-9 Sites: US-Wkg

Temperature As A Control Over Ecosystem CO2 Fluxes In A High-Elevation, Subalpine Forest
Huxman, T. E., Turnipseed, A. A., Sparks, J. P., Harley, P. C., Monson, R. K.

We evaluated the hypothesis that CO2 uptake by a subalpine, coniferous forest is limited by cool temperature during the growing season. Using the eddy covariance approach we conducted observations of net ecosystem CO2 exchange (NEE) across two growing seasons. When pooled for the entire growing season during …


Journal: Oecologia, Volume 134 (4): 537-546 (2003), ISBN . DOI: 10.1007/s00442-002-1131-1 Sites: US-NR1