Publications

Publications Found: 1437

Direct Measurement Of Biosphere-Atmosphere Isotopic Co2exchange Using The Eddy Covariance Technique
Griffis, T.J., Sargent, S.D., Baker, J.M., Lee, X., Tanner, B.D., Greene, J., Swiatek, E., Billmark, K.

Quantifying isotopic CO2 exchange between the biosphere and atmosphere presents a significant measurement challenge, but has the potential to provide important constraints on local, regional, and global carbon cycling. Past approaches have indirectly estimated isotopic CO2 exchange using relaxed eddy accumulation, …


Journal: Journal Of Geophysical Research, Volume 113 (D8): n/a-n/a (2008). DOI: 10.1029/2007JD009297 Sites: US-Ro1

Drought During Canopy Development Has Lasting Effect On Annual Carbon Balance In A Deciduous Temperate Forest
Noormets, A., McNulty, S. G., DeForest, J. L., Sun, G., Li, Q., Chen, J.
  • Climate change projections predict an intensifying hydrologic cycle and an increasing frequency of droughts, yet quantitative understanding of the effects on ecosystem carbon exchange remains limited.
  • Here, the effect of contrasting precipitation and soil moisture dynamics were evaluated …

    Journal: New Phytologist, Volume 179 (3): 818-828 (2008). DOI: 10.1111/j.1469-8137.2008.02501.x Sites: US-Oho

Observations And Stochastic Modeling Of Soil Moisture Control On Evapotranspiration In A Californian Oak Savanna
Chen, X., Rubin, Y., Ma, S., Baldocchi, D.

The study of water exchange between soil, plants, and the atmosphere in response to seasonal or periodic droughts is critical to modeling the hydrologic cycle and biogeochemical processes in water-controlled ecosystems. An essential step in such studies is to characterize changes in evaporation and transpiration under water stress. …


Journal: Water Resources Research, Volume 44 (8): n/a-n/a (2008). DOI: 10.1029/2007wr006646 Sites: US-Ton

The Ecohydrologic Significance Of Hydraulic Redistribution In A Semiarid Savanna
Scott, R. L., Cable, W. L., Hultine, K. R.

Recent studies have illuminated the process of hydraulic redistribution, defined as the translocation of soil moisture via plant root systems, but the long-term ecohydrologic significance of this process is poorly understood. We investigated hydraulic redistribution (HR) by Prosopis velutina Woot. (velvet mesquite) in an …


Journal: Water Resources Research, Volume 44 (W02440): n/a-n/a (2008). DOI: 10.1029/2007wr006149 Sites: US-SRM

Spring Warming And Carbon Dioxide Exchange Over Low Arctic Tundra In Central Canada
Lafleur, P.M., Humphreys, E.R.

Tundra-atmosphere exchanges of carbon dioxide (CO2) and water vapour were measured near Daring Lake, Northwest Territories in the Canadian Low Arctic for 3 years, 2004–2006. The measurement period spanned late-winter until the end of the growing period. Mean temperatures during the measurement period varied from about …


Journal: Global Change Biology, Volume 14 (4): 740-756 (2008). DOI: 10.1111/j.1365-2486.2007.01529.x Sites: CA-DL1

Use Of Digital Webcam Images To Track Spring Green-Up In A Deciduous Broadleaf Forest
Richardson, A. D., Jenkins, J. P., Braswell, B. H., Hollinger, D. Y., Ollinger, S. V., Smith, M.

Understanding relationships between canopy structure and the seasonal dynamics of photosynthetic uptake of CO2 by forest canopies requires improved knowledge of canopy phenology at eddy covariance flux tower sites. We investigated whether digital …


Journal: Oecologia, Volume 152 (2): 323-334 (2007). DOI: 10.1007/s00442-006-0657-z Sites: US-Bar

A Long-Term Record Of Carbon Exchange In A Boreal Black Spruce Forest: Means, Responses To Interannual Variability, And Decadal Trends
Dunn, A. L., Barford, C. C., Wofsy, S. C., Goulden, M. L., Daube, B. C.

We present a decadal (1994–2004) record of carbon dioxide flux in a 160-year-old black spruce forest/veneer bog complex in central Manitoba, Canada. The ecosystem shifted …


Journal: Global Change Biology, Volume 13 (3): 577-590 (2007). DOI: 10.1111/j.1365-2486.2006.01221.x Sites: CA-Man

Assessment of winter fluxes of CO2 and CH4 in boreal forest soils of central Alaska estimated by the profile method and the chamber method: A diagnosis of methane emission and implications for the regional carbon budget
Kim, Y., Ueyama, M., Nakagawa, F., Tsunogai, U., Harazono, Y. and Tanaka, N.


Journal: Tellus, Volume 59B: 223-233 (2007). DOI: Sites: US-Uaf

What The Towers Don'T See At Night: Nocturnal Sap Flow In Trees And Shrubs At Two Ameriflux Sites In California
Fisher, J. B., Baldocchi, D. D., Misson, L., Dawson, T. E., Goldstein, A. H.

At the leaf scale, it is a long-held assumption that stomata close at night in the absence of light, causing transpiration to decrease to zero. Energy balance models and evapotranspiration equations often rely on net radiation as an upper bound, and some models reduce evapotranspiration to zero at night when there is no solar radiation. …


Journal: Tree Physiology, Volume 27 (4): 597-610 (2007). DOI: 10.1093/treephys/27.4.597 Sites: US-Ton

Allometry And Partitioning Of Above- And Belowground Tree Biomass In An Age-Sequence Of White Pine Forests
Peichl, M., Arain, M. A.

The allometry and partitioning of above- and belowground tree biomass was studied in an age-sequence of four eastern white pine (Pinus strobus L.) forests (2-, 15-, 30-, and 65-year-old) in southern Ontario, Canada. Biomass in each tree component, i.e. foliage, …


Journal: Forest Ecology And Management, Volume 253 (1-3): 68-80 (2007). DOI: 10.1016/j.foreco.2007.07.003 Sites: CA-TP1, CA-TP2, CA-TP3, CA-TP4