Publications

Publications Found: 1373

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

Water Limitations To Carbon Exchange In Old-Growth And Young Ponderosa Pine Stands
Irvine, J., Law, B. E., Anthoni, P. M., Meinzer, F. C.
We investigated the impact of seasonal soil water deficit on the processes driving net ecosystem exchange of carbon (NEE) in old-growth and recently regenerating ponderosa pine (Pinus ponderosa Doug. ex Laws.) stands in Oregon. We measured seasonal patterns of transpiration, canopy conductance and …


Journal: Tree Physiology, Volume 22 (2-3): 189-196 (2002), ISBN . DOI: 10.1093/treephys/22.2-3.189 Sites: US-Me4

Estimating Net Primary Productivity From Grassland Biomass Dynamics Measurements
Scurlock, J. M., Johnson, K., Olson, R. J.

To address the need for a high quality data set based upon field observations suitable for parameterization, calibration, and validation of terrestrial biosphere models, we have developed a comprehensive global database on net primary productivity (NPP). We have compiled field measurements of biomass and associated environmental …


Journal: Global Change Biology, Volume 8 (8): 736-753 (2002), ISBN . DOI: 10.1046/j.1365-2486.2002.00512.x Sites: US-KFB, US-Kon

Seasonal And Interannual Variation In Carbon Dioxide Exchange And Carbon Balance In A Northern Temperate Grassland
Flanagan, L. B., Wever, L. A., Carlson, P. J.

Net ecosystem carbon dioxide (CO2) exchange (NEE) was measured in a northern temperate grassland near Lethbridge, Alberta, Canada for three growing seasons using the eddy covariance technique. The study objectives were to document how NEE and its major component processes—gross photosynthesis (GPP) and total ecosystem …


Journal: Global Change Biology, Volume 8 (7): 599-615 (2002), ISBN . DOI: 10.1046/j.1365-2486.2002.00491.x Sites: CA-Let

Short-Term Light And Leaf Photosynthetic Dynamics Affect Estimates Of Daily Understory Photosynthesis In Four Tree Species
Naumburg, E., Ellsworth, D. S.
Instantaneous measurements of photosynthesis are often implicitly or explicitly scaled to longer time frames to provide an understanding of plant performance in a given environment. For plants growing in a forest understory, results from photosynthetic light response curves in conjunction with diurnal light …


Journal: Tree Physiology, Volume 22 (6): 393-401 (2002), ISBN . DOI: 10.1093/treephys/22.6.393 Sites: US-Dk3

Effects Of Aggregated Classifications Of Forest Composition On Estimates Of Evapotranspiration In A Northern Wisconsin Forest
Mackay, D. S., Ahl, D. E., Ewers, B. E., Gower, S. T., Burrows, S. N., Samanta, S., Davis, K. J.

Forest management presents challenges to accurate prediction of water and carbon exchange between the land surface and atmosphere, due to its alteration of forest structure …


Journal: Global Change Biology, Volume 8 (12): 1253-1265 (2002), ISBN . DOI: 10.1046/j.1365-2486.2002.00554.x Sites: US-PFa