AmeriFlux Publications from the Community

Phenophases Alter The Soil Respiration–Temperature Relationship In An Oak-Dominated Forest
DeForest, J. L., Noormets, A., McNulty, S. G., Sun, G., Tenney, G., Chen, J.

Soil respiration (SR) represents a major component of forest ecosystem respiration and is influenced seasonally by environmental factors such as temperature, soil moisture, root respiration, and litter fall. Changes in these environmental factors correspond with shifts in plant phenology. In this study, we examined the relationship …

Journal: International Journal Of Biometeorology, Volume 51 (2): 135-144 (2006), ISBN . DOI: 10.1007/s00484-006-0046-7 Sites: US-Oho

Comparison Of Net Ecosystem CO2 Exchange In Two Peatlands In Western Canada With Contrasting Dominant Vegetation, Sphagnum And Carex
Glenn, A. J., Flanagan, L. B., Syed, K. H., Carlson, P. J.

Net ecosystem carbon dioxide exchange was measured in two contrasting peatlands in northern Alberta, Canada using the eddy covariance technique during the growing season (May–October). Sphagnum spp. made up approximately 66% of the total LAI (1.52 m² m⁻²) at the poor fen and the total N content …

Journal: Agricultural And Forest Meteorology, Volume 140 (1-4): 115-135 (2006), ISBN . DOI: 10.1016/j.agrformet.2006.03.020 Sites: CA-WP2, CA-WP3

Seasonal Measurements Of Acetone And Methanol: Abundances And Implications For Atmospheric Budgets
Schade, G. W., Goldstein, A. H.

Acetone and methanol have been measured hourly at a rural mountain site in California for a full year, providing a unique data set for analyzing the factors controlling their seasonal cycles. Their mixing ratios showed clear maxima in summer and late spring respectively, and were mostly correlated with atmospheric temperature with …

Journal: Global Biogeochemical Cycles, Volume 20 (1): 1-10 (2006), ISBN . DOI: 10.1029/2005gb002566 Sites: US-Blo

Nocturnal Cold Air Drainage And Pooling In A Tropical Forest
Goulden, M. L., Miller, S. D., da Rocha, H. R.

The usefulness of eddy covariance for understanding terrestrial carbon exchange has been hampered by uncertainty over the magnitude and causes of a systematic underestimation of CO₂ efflux on calm nights. We combined in situ measurements of the temperature, wind and CO₂ profile with nocturnal Land Surface Temperature …

Journal: Journal Of Geophysical Research, Volume 111 (D8): n/a-n/a (2006), ISBN . DOI: 10.1029/2005jd006037 Sites: BR-Sa3

Effects Of Experimental Drought On Soil Respiration And Radiocarbon Efflux From A Temperate Forest Soil
Borken, W., Savage, K., Davidson, E. A., Trumbore, S. E.

Soil moisture affects microbial decay of SOM and rhizosphere respiration (RR) in temperate forest soils, but isolating the response of soil respiration (SR) to summer drought and subsequent wetting is difficult because moisture changes are often confounded with temperature variation. We distinguished between temperature and moisture …

Journal: Global Change Biology, Volume 12 (2): 177-193 (2006), ISBN . DOI: 10.1111/j.1365-2486.2005.001058.x Sites: US-LPH

An Eddy Covariance Mesonet To Measure The Effect Of Forest Age On Land-Atmosphere Exchange
Goulden, M. L., Winston, G. C., McMillan, A. M., Litvak, M. E., Read, E. L., Rocha, A. V., Rob Elliot, J.

We deployed a mesonet of year-round eddy covariance towers in boreal forest stands that last burned in ∼1850, ∼1930, 1964, 1981, 1989, 1998, and 2003 to understand how CO₂ exchange and evapotranspiration change during secondary succession. We used MODIS imagery to establish that the tower sites were representative …

Journal: Global Change Biology, Volume 12 (11): 2146-2162 (2006), ISBN . DOI: 10.1111/j.1365-2486.2006.01251.x Sites: CA-NS1, CA-NS2, CA-NS3, CA-NS5, CA-NS6, CA-NS7

Direct And Indirect Effects Of Atmospheric Conditions And Soil Moisture On Surface Energy Partitioning Revealed By A Prolonged Drought At A Temperate Forest Site
Gu, L., Meyers, T., Pallardy, S. G., Hanson, P. J., Yang, B., Heuer, M., Hosman, K. P., Riggs, J. S., Sluss, D., Wullschleger, S. D.

The purpose of this paper is to examine the mechanism that controls the variation of surface energy partitioning between latent and sensible heat fluxes at a temperate deciduous forest site in central Missouri, USA. Taking advantage of multiple micrometeorological and ecophysiological measurements and a prolonged drought in the middle …

Journal: Journal Of Geophysical Research, Volume 111 (D16): n/a-n/a (2006), ISBN . DOI: 10.1029/2006JD007161 Sites: US-MOz

Sap Flux-Upscaled Canopy Transpiration, Stomatal Conductance, And Water Use Efficiency In An Old Growth Forest In The Great Lakes Region Of The United States
Tang, J., Bolstad, P. V., Ewers, B. E., Desai, A. R., Davis, K. J., Carey, E. V.

Combining sap flux and eddy covariance measurements provides a means to study plant stomatal conductance and the relationship between transpiration and photosynthesis. We measured sap flux using Granier-type sensors in a northern hardwood-dominated old growth forest in Michigan, upscaled to canopy transpiration, and calculated canopy …

Journal: Journal Of Geophysical Research: Biogeosciences, Volume 111 (G2): n/a-n/a (2006), ISBN . DOI: 10.1029/2005JG000083 Sites: US-Syv

Fine-Resolution Mapping Of Soil Organic Carbon Based On Multivariate Secondary Data
Simbahan, G. C., Dobermann, A., Goovaerts, P., Ping, J., Haddix, M. L.

Our objective was to quantify the improvement in fine-resolution maps of soil organic carbon stock (CS, Mg C ha^− 1) resulting from utilizing multivariate sources of secondary information. Different geostatistical techniques for mapping CS in the top 0.3 m of …

Journal: Geoderma, Volume 132 (3-4): 471-489 (2006), ISBN . DOI: 10.1016/j.geoderma.2005.07.001 Sites: US-Ne1, US-Ne2, US-Ne3

Separating The Effects Of Climate And Vegetation On Evapotranspiration Along A Successional Chronosequence In The Southeastern US
Stoy, P. C., Katul, G. G., Siqueira, M. B., Juang, J., Novick, K. A., Mccarthy, H. R., Christopher Oishi, A., Uebelherr, J. M., Kim, H., Oren, R.

We combined Eddy-covariance measurements with a linear perturbation analysis to isolate the relative contribution of physical and biological drivers on evapotranspiration (ET) …

Journal: Global Change Biology, Volume 12 (11): 2115-2135 (2006), ISBN . DOI: 10.1111/j.1365-2486.2006.01244.x Sites: US-Dk3

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