AmeriFlux Publications from the Community

Environmental And Biological Controls On Water And Energy Exchange In Florida Scrub Oak And Pine Flatwoods Ecosystems
Bracho, R., Powell, T. L., Dore, S., Li, J., Hinkle, C. R., Drake, B. G.

Scrub oak and pine flatwoods are two contrasting ecosystems common to the humid subtropical climate of Florida. Scrub oak forests are short in stature (<2 m) and occur on well-drained sandy soils, and pine flatwoods are much taller and occur in areas with poorly drained soils. Eddy covariance measurements were made from January …

Journal: Journal Of Geophysical Research: Biogeosciences, Volume 113 (G02004): n/a-n/a (2008), ISBN . DOI: 10.1029/2007jg000469 Sites: US-KS1, US-KS2

Effect Of Soil Water Stress On Soil Respiration And Its Temperature Sensitivity In An 18-Year-Old Temperate Douglas-Fir Stand
Jassal, R. S., Black, T. A., Novak, M. D., Gaumont-Guay, D., Nesic, Z.

We analyzed 17 months (August 2005 to December 2006) of continuous measurements of soil CO₂ efflux or soil respiration (R_S) in an 18-year-old west-coast temperate Douglas-fir stand that experienced somewhat greater than normal summertime water deficit. For soil water content at the 4 cm depth (θ) …

Journal: Global Change Biology, Volume 14 (6): 1305-1318 (2008), ISBN . DOI: 10.1111/j.1365-2486.2008.01573.x Sites: CA-Ca1, CA-Ca2, CA-Ca3

Flux Partitioning In An Old-Growth Forest: Seasonal And Interannual Dynamics
Falk, M., Wharton, S., Schroeder, M., Ustin, S., U, K. T.

Turbulent fluxes of carbon, water and energy were measured at the Wind River Canopy Crane, Washington, USA from 1999 to 2004 with eddy-covariance instrumentation above (67 m) and below (2.5 m) the forest canopy. Here we present the decomposition of net ecosystem exchange of carbon (NEE) into gross primary …

Journal: Tree Physiology, Volume 28 (4): 509-520 (2008), ISBN . DOI: 10.1093/treephys/28.4.509 Sites: US-Wrc

Ecosystem Respiration And Its Components In An Old-Growth Forest In The Great Lakes Region Of The United States
Tang, J., Bolstad, P. V., Desai, A. R., Martin, J. G., Cook, B. D., Davis, K. J., Carey, E. V.

Ecosystem respiration and its components are sensitive to age, species, stand structure, and environmental conditions, and substantially influence net ecosystem productivity. We measured ecosystem respiration and component respiration including soil, woody debris, stem and leaf respiration in old-growth hardwood-dominated and hemlock-dominated …

Journal: Agricultural And Forest Meteorology, Volume 148 (2): 171-185 (2008), ISBN . DOI: 10.1016/j.agrformet.2007.08.008 Sites: US-Syv

Influence Of Vegetation And Seasonal Forcing On Carbon Dioxide Fluxes Across The Upper Midwest, Usa: Implications For Regional Scaling
Desai, A. R., Noormets, A., Bolstad, P. V., Chen, J., Cook, B. D., Davis, K. J., Euskirchen, E. S., Gough, C., Martin, J. G., Ricciuto, D. M., Schmid, H. P., Tang, J., Wang, W.

Carbon dioxide fluxes were examined over the growing seasons of 2002 and 2003 from 14 different sites in Upper Midwest (USA) to assess spatial variability of ecosystem–atmosphere CO₂ exchange. These sites were exposed to similar temperature/precipitation regimes and spanned a range of vegetation types typical of the …

Journal: Agricultural And Forest Meteorology, Volume 148 (2): 288-308 (2008), ISBN . DOI: 10.1016/j.agrformet.2007.08.001 Sites: US-Los, US-PFa, US-Syv, US-WCr, US-Wi0, US-Wi1, US-Wi2, US-Wi3, US-Wi4, US-Wi6, US-Wi8

Moisture Sensitivity Of Ecosystem Respiration: Comparison Of 14 Forest Ecosystems In The Upper Great Lakes Region, USA
Noormets, A., Desai, A., Cook, B., Euskirchen, E., Ricciuto, D., Davis, K., Bolstad, P., Schmid, H., Vogel, C., Carey, E., Su, H., Chen, J.

Ecosystem respiration (ER) was measured with the eddy covariance technique in 14 forest ecosystems in the Upper Great Lakes Region during the growing seasons of 2002 and 2003. The response of ER to soil temperature and moisture was analyzed using empirical models. On average, …

Journal: Agricultural And Forest Meteorology, Volume 148 (2): 216-230 (2008), ISBN . DOI: 10.1016/j.agrformet.2007.08.002 Sites: US-Wi0, US-Wi1, US-Wi2, US-Wi3, US-Wi4, US-Wi6, US-Wi8

Interannual Variation In Soil CO2 Efflux And The Response Of Root Respiration To Climate And Canopy Gas Exchange In Mature Ponderosa Pine
Irvine, J., Law, B. E., Martin, J. G., Vickers, D.

We examined a 6-year record of automated chamber-based soil CO₂ efflux (F_s) and the underlying processes in relation to climate and canopy gas …

Journal: Global Change Biology, Volume 14 (12): 2848-2859 (2008), ISBN . DOI: 10.1111/j.1365-2486.2008.01682.x Sites: US-Me2

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), ISBN . DOI: 10.1029/2007wr006646 Sites: US-Ton

Water Flux Components And Soil Water-Atmospheric Controls In A Temperate Pine Forest Growing In A Well-Drained Sandy Soil
McLaren, J. D., Arain, M.A., Khomik, M., Peichl, M., Brodeur, J.

The influences of soil water supply and atmospheric demand on transpiration were studied to gain insight into the physical mechanisms limiting forest water use within the broader context of total canopy water loss to the atmosphere. Evaporation from forests (E) can be partitioned in to four main source components: canopy …

Journal: Journal Of Geophysical Research, Volume 113 (G4): n/a-n/a (2008), ISBN . DOI: 10.1029/2007JG000653 Sites: CA-TP1, CA-TP3, CA-TP4

Estimating Components Of Forest Evapotranspiration: A Footprint Approach For Scaling Sap Flux Measurements
Oishi, A. C., Oren, R., Stoy, P. C.

Forest evapotranspiration (ET) estimates that include scaled sap flux measurements often underestimate eddy covariance (EC)-measured latent heat flux (LE). We investigated potential causes for this bias using 4 years of coupled sap flux and LE measurements from a mature …

Journal: Agricultural And Forest Meteorology, Volume 148 (11): 1719-1732 (2008), ISBN . DOI: 10.1016/j.agrformet.2008.06.013 Sites: US-Dk3

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