Publications

Publications Found: 1437

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

Objective Threshold Determination For Nighttime Eddy Flux Filtering
Gu, L., Falge, E. M., Boden, T., Baldocchi, D. D., Black, T., Saleska, S. R., Suni, T., Verma, S. B., Vesala, T., Wofsy, S. C., Xu, L.

We recommend an automated statistical method (Moving Point Test, or MPT) to determine the friction velocity (u*) thresholds in nighttime eddy flux filtering. Our intention is to make the determination of the u* thresholds objective and reproducible and to keep flux treatment consistent over …


Journal: Agricultural And Forest Meteorology, Volume 128 (3-4): 179-197 (2005). DOI: 10.1016/j.agrformet.2004.11.006 Sites: BR-Sa1, CA-Oas, US-Shd, US-Ton, US-Var

Vertical Stratification Of Soil Water Storage And Release Dynamics In Pacific Northwest Coniferous Forests
Warren, J., Meinzer, F., Brooks, J., Domec, J.

We characterized vertical variation in the seasonal release of stored soil moisture in old-growth ponderosa pine (OG-PP, xeric), and young and old-growth Douglas-fir (Y-DF, OG-DF, mesic) forests to evaluate changes in water availability for root uptake. Soil water potential (ψ) and volumetric water content (θ) …


Journal: Agricultural And Forest Meteorology, Volume 130 (1-2): 39-58 (2005). DOI: 10.1016/j.agrformet.2005.01.004 Sites: US-Me4

Variability In Net Primary Production And Carbon Storage In Biomass Across Oregon Forests—An Assessment Integrating Data From Forest Inventories, Intensive Sites, And Remote Sensing
Van Tuyl, S., Law, B., Turner, D., Gitelman, A.

We used a combination of data from USDA Forest Service inventories, intensive chronosequences, extensive sites, and satellite remote sensing, to estimate biomass and net primary production (NPP) for the forested region of western Oregon. The study area was divided into four …


Journal: Forest Ecology And Management, Volume 209 (3): 273-291 (2005). DOI: 10.1016/j.foreco.2005.02.002 Sites: US-Me2, US-Me4, US-Me5

Spatial Analysis Of Growing Season Length Control Over Net Ecosystem Exchange
Churkina, G., Schimel, D., Braswell, B. H., Xiao, X.

Using data from 28 flux measurement sites, we performed an analysis of the relationship between annual net ecosystem exchange (NEE) and the length of the carbon uptake period …


Journal: Global Change Biology, Volume 11 (10): 1777-1787 (2005). DOI: 10.1111/j.1365-2486.2005.001012.x Sites: US-NR1

Annual Soil Respiration In Broadleaf Forests Of Northern Wisconsin: Influence Of Moisture And Site Biological, Chemical, And Physical Characteristics
Martin, J. G., Bolstad, P. V.

Soil temperature and moisture influence soil respiration at a range of temporal and spatial scales. Although soil temperature and moisture may be seasonally correlated, intra and inter-annual variations in soil moisture do occur. There are few direct observations …


Journal: Biogeochemistry, Volume 73 (1): 149-182 (2005). DOI: 10.1007/s10533-004-5166-8 Sites: US-WCr

Comparing Net Ecosystem Exchange Of Carbon Dioxide Between An Old-Growth And Mature Forest In The Upper Midwest, Usa
Desai, A. R., Bolstad, P. V., Cook, B. D., Davis, K. J., Carey, E. V.

Old-growth forests are often assumed to exhibit no net carbon assimilation over time periods of several years. This generalization has not been typically supported by the few whole-ecosystem, stand-scale eddy-covariance measurements of carbon dioxide exchange in old-growth forests. An eddy-flux tower installed in a >300-year-old …


Journal: Agricultural And Forest Meteorology, Volume 128 (1-2): 33-55 (2005). DOI: 10.1016/j.agrformet.2004.09.005 Sites: US-Syv, US-WCr

Relationship Between Soil CO2 Concentrations And Forest-Floor CO2 Effluxes
Jassal, R., Black, A., Novak, M., Morgenstern, K., Nesic, Z., Gaumont-Guay, D.

To better understand the biotic and abiotic factors that control soil CO2 efflux, we compared seasonal and diurnal variations in simultaneously measured forest-floor CO2effluxes and soil CO2 concentration profiles in a 54-year-old Douglas fir forest on the east coast of Vancouver Island. …


Journal: Agricultural And Forest Meteorology, Volume 130 (3-4): 176-192 (2005). DOI: 10.1016/j.agrformet.2005.03.005 Sites: CA-Ca1

Carbon Budget Of Mature No-Till Ecosystem In North Central Region Of The United States
Hollinger, S. E., Bernacchi, C. J., Meyers, T. P.

Continuous measurements of carbon flux from 1997 to 2002 by eddy-covariance were used to evaluate the carbon budget for a maize (Zea mays L.) and soybean (Glycine max (L.) Merr.) rotation agricultural ecosystem that has been in no-till cultivation for over …


Journal: Agricultural And Forest Meteorology, Volume 130 (1-2): 59-69 (2005). DOI: 10.1016/j.agrformet.2005.01.005 Sites: US-Bo1, US-Bo2

The Conversion Of The Corn/Soybean Ecosystem To No-Till Agriculture May Result In A Carbon Sink
Bernacchi, C. J., Hollinger, S. E., Meyers, T.

Mitigating or slowing an increase in atmospheric carbon dioxide concentration ([CO2]) has been the focus of international efforts, most apparent with the development …


Journal: Global Change Biology, Volume 11 (11): 1867-1872 (2005). DOI: 10.1111/j.1365-2486.2005.01050.x Sites: US-Bo1, US-Bo2