Publications

Publications Found: 1378

Seasonal Differences In Carbon And Water Vapor Exchange In Young And Old-Growth Ponderosa Pine Ecosystems
Anthoni, P. M., Unsworth, M. H., Law, B. E., Irvine, J., Baldocchi, D. D., Tuyl, S. V., Moore, D.

Eddy covariance measurements of carbon dioxide and water vapor exchange were made above a young and an old-growth ponderosa pine (Pinus ponderosa Dougl. ex P. & C. Laws) ecosystem located in a semiarid environment in central Oregon. The old-growth stand (O site) is a mixture of 250- and 50-year-old ponderosa …


Journal: Agricultural And Forest Meteorology, Volume 111 (3): 203-222 (2002), ISBN . DOI: 10.1016/s0168-1923(02)00021-7 Sites: US-Me4, US-Me5

Carbon Exchange Of An Old-Growth Eastern Hemlock (Tsuga Canadensis) Forest In Central New England
Hadley, J. L., Schedlbauer, J. L.

Carbon (C) exchange of a ∼200-year-old eastern hemlock (Tsuga canadensis L.) forest in central Massachusetts, USA, was estimated from mid-October 2000 through October 2001 based on eddy covariance measurements and statistical modeling from microclimatic data. Measurements were made in 68% of the hours during the year of …


Journal: Tree Physiology, Volume 22 (15-16): 1079-1092 (2002), ISBN . DOI: 10.1093/treephys/22.15-16.1079 Sites: US-Ha2

Patterns Of Species Richness And Composition In Re-Created Grassland
Sluis, W. J.

The success of many prairie restorations is not well documented. A restoration begun in 1975 at the Fermi National Accelerator Laboratory near Chicago, Illinois allows assessment …


Journal: Restoration Ecology, Volume 10 (4): 677-684 (2002), ISBN . DOI: 10.1046/j.1526-100x.2002.01048.x Sites: US-IB1, US-IB2

Minimizing Artifacts And Biases In Chamber-Based Measurements Of Soil Respiration
Davidson, E., Savage, K., Verchot, L., Navarro, R.

Soil respiration is one of the largest and most important fluxes of carbon in terrestrial ecosystems. While eddy covariance methods are becoming widely used to measure nighttime total ecosystem respiration, the use of chambers placed over the soil is the most direct way of measuring respiration occurring within the soil and litter …


Journal: Agricultural And Forest Meteorology, Volume 113 (1-4): 21-37 (2002), ISBN . DOI: 10.1016/s0168-1923(02)00100-4 Sites: US-Ho1

Photosynthesis And Respiration Of Black Spruce At Three Organizational Scales: Shoot, Branch And Canopy
Rayment, M. B., Loustau, D., Jarvis, P. J.
To gain insight into the function of photosynthesis and respiration as processes operating within a global ecosystem, we measured gas exchange of mature black spruce (Picea mariana (Mill.) B.S.P.) trees at three organizational scales: individual shoots, whole branches and a forest canopy. A biochemical …


Journal: Tree Physiology, Volume 22 (4): 219-229 (2002), ISBN . DOI: 10.1093/treephys/22.4.219 Sites: CA-Obs

Energy Budget Above A High-Elevation Subalpine Forest In Complex Topography
Turnipseed, A., Blanken, P., Anderson, D., Monson, R.

Components of the energy budget were measured above a subalpine coniferous forest over two complete annual cycles. Sensible and latent heat fluxes were measured by eddy covariance. Bowen ratios ranged from 0.7 to 2.5 in the summer (June–September) depending upon the availability of soil water, but were considerably higher (∼3–6) …


Journal: Agricultural And Forest Meteorology, Volume 110 (3): 177-201 (2002), ISBN . DOI: 10.1016/s0168-1923(01)00290-8 Sites: US-NR1

Measuring Forest Floor CO2 Fluxes In A Douglas-Fir Forest
Drewitt, G., Black, T., Nesic, Z., Humphreys, E., Jork, E., Swanson, R., Ethier, G., Griffis, T., Morgenstern, K.

CO2 exchange was measured on the forest floor of a coastal temperate Douglas-fir forest located near Campbell River, British Columbia, Canada. Continuous measurements were obtained at six locations using an automated chamber system between April and December, 2000. Fluxes were measured every half hour by circulating chamber …


Journal: Agricultural And Forest Meteorology, Volume 110 (4): 299-317 (2002), ISBN . DOI: 10.1016/s0168-1923(01)00294-5 Sites: CA-Ca1

Extensive Belowground Carbon Storage Supports Roots And Mycorrhizae In Regenerating Scrub Oaks
Langley, J. A., Drake, B. G., Hungate, B. A.

Portions of a regenerating scrub oak ecosystem were enclosed in open-top chambers and exposed to elevated CO2. The distinct 13C signal of the supplemental CO2 was used to trace the rate of C integration into various ecosystem …


Journal: Oecologia, Volume 131 (4): 542-548 (2002), ISBN . DOI: 10.1007/s00442-002-0932-6 Sites: US-KS2

Modeling Seasonal To Annual Carbon Balance Of Mer Bleue Bog, Ontario, Canada
Frolking, S., Roulet, N. T., Moore, T. R., Lafleur, P. M., Bubier, J. L., Crill, P. M.

Northern peatlands contain enormous quantities of organic carbon within a few meters of the atmosphere and play a significant role in the planetary carbon balance. We have developed a new, process-oriented model of the contemporary carbon balance of northern peatlands, the Peatland Carbon Simulator (PCARS). Components of PCARS are …


Journal: Global Biogeochemical Cycles, Volume 16 (3): 1-21 (2002), ISBN . DOI: 10.1029/2001gb001457 Sites: CA-Mer

Modelling Night-Time Ecosystem Respiration By A Constrained Source Optimization Method
Lai, C., Katul, G., Butnor, J., Ellsworth, D., Oren, R.

One of the main challenges to quantifying ecosystem carbon budgets is properly quantifying the magnitude of night-time ecosystem respiration. Inverse Lagrangian dispersion …


Journal: Global Change Biology, Volume 8 (2): 124-141 (2002), ISBN . DOI: 10.1046/j.1354-1013.2001.00447.x Sites: US-Dk3