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Publications Found: 49

Spatial–Temporal Variation In Soil Respiration In An Oak–Grass Savanna Ecosystem In California And Its Partitioning Into Autotrophic And Heterotrophic Components
Tang, J., Baldocchi, D. D.

The spatial upscaling of soil respiration from field measurements to ecosystem levels will be biased without studying its spatial variation. We took advantage of the unique spatial gradients of an oak–grass savanna ecosystem in California, with widely spaced oak trees overlying a grass layer, to study the spatial variation in soil …

Journal: Biogeochemistry, Volume 73 (1): 183-207 (2005), ISBN . DOI: 10.1007/s10533-004-5889-6 Sites: US-Ton

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), ISBN . DOI: 10.1016/j.agrformet.2004.11.006 Sites: BR-Sa1, CA-Oas, US-Shd, US-Ton, US-Var

An Analysis Of Soil Respiration Across Northern Hemisphere Temperate Ecosystems
Hibbard, K. A., Law, B. E., Reichstein, M., Sulzman, J.

Over two-thirds of terrestrial carbon is stored belowground and a significant amount of atmospheric CO₂ is respired by roots and microbes in soils. For this analysis, soil respiration (Rs) data were assembled from 31 AmeriFlux and CarboEurope sites representing deciduous broadleaf, evergreen needleleaf, grasslands, mixed …

Journal: Biogeochemistry, Volume 73 (1): 29-70 (2005), ISBN . DOI: 10.1007/s10533-004-2946-0 Sites: US-Dk3, US-Ho1, US-Me2, US-Me4, US-Me5, US-NR1, US-Ton, US-UMB, US-WCr

Midday Values Of Gross CO2 Flux And Light Use Efficiency During Satellite Overpasses Can Be Used To Directly Estimate Eight-Day Mean Flux
Sims, D. A., Rahman, A. F., Cordova, V. D., Baldocchi, D. D., Flanagan, L. B., Goldstein, A. H., Hollinger, D. Y., Misson, L., Monson, R. K., Schmid, H. P., Wofsy, S. C., Xu, L.

Most satellites provide, at best, a single daily snapshot of vegetation and, at worst, these snapshots may be separated by periods of many days when the ground was obscured by cloud cover. Since vegetation carbon exchange can be very dynamic on diurnal and day-to-day timescales, the limited temporal resolution of satellite data is …

Journal: Agricultural And Forest Meteorology, Volume 131 (1-2): 1-12 (2005), ISBN . DOI: 10.1016/j.agrformet.2005.04.006 Sites: CA-Let, US-Blo, US-Ho1, US-MMS, US-NR1, US-Ton, US-Var

How Plant Functional-Type, Weather, Seasonal Drought, And Soil Physical Properties Alter Water And Energy Fluxes Of An Oak–Grass Savanna And An Annual Grassland
Baldocchi, D. D., Xu, L., Kiang, N.

Savannas and open grasslands often co-exist in semi-arid regions. Questions that remain unanswered and are of interest to biometeorologists include: how do these contrasting landscapes affect the exchanges of energy on seasonal and annual time scales; and, do biophysical constraints imposed by water supply and water demand …

Journal: Agricultural And Forest Meteorology, Volume 123 (1-2): 13-39 (2004), ISBN . DOI: 10.1016/j.agrformet.2003.11.006 Sites: US-Ton, US-Var

How Soil Moisture, Rain Pulses, And Growth Alter The Response Of Ecosystem Respiration To Temperature
Xu, L., Baldocchi, D. D., Tang, J.

Journal: Global Biogeochemical Cycles, Volume 18 (4): n/a-n/a (2004), ISBN . DOI: 10.1029/2004gb002281 Sites: US-Ton, US-Var

How soil moisture, rain pulses, and growth alter the response of ecosystem respiration to temperature
Xu, L., Baldocchi, D.D., Tang, J.

In this paper, we analyzed 3 years of carbon flux data from continuous eddy covariance measurements to investigate how soil moisture, rain pulses, and growth alter the response of ecosystem respiration to temperature. The data were acquired over an annual grassland and from the grass understory of an oak/grass savanna ecosystem in …

Journal: Global Biogeochemical Cycles, Volume 18 (GB4002): 0-0 (2004), ISBN . DOI: 10.1029/2004GB002281 Sites: US-Ton

Assessing Soil CO2 Efflux Using Continuous Measurements Of CO2 Profiles In Soils With Small Solid-State Sensors
Tang, J., Baldocchi, D. D., Qi, Y., Xu, L.

This paper describes a new method to monitor continuously soil CO₂ profiles using small solid-state CO₂ sensors buried at different depths of the soil. Based on the measurement of soil CO₂ profile and a gaseous diffusivity model, we estimated …

Journal: Agricultural And Forest Meteorology, Volume 118 (3-4): 207-220 (2003), ISBN . DOI: 10.1016/s0168-1923(03)00112-6 Sites: US-Ton

Seasonal Trends In Photosynthetic Parameters And Stomatal Conductance Of Blue Oak (Quercus Douglasii) Under Prolonged Summer Drought And High Temperature
Xu, L., Baldocchi, D. D.

Understanding seasonal changes in photosynthetic parameters and stomatal conductance is crucial for modeling long-term carbon uptake and energy fluxes of ecosystems. Gas exchange measurements of CO₂ and light response curves on blue oak leaves (Quercus douglasii H. & A.) were conducted weekly throughout the …

Journal: Tree Physiology, Volume 23 (13): 865-877 (2003), ISBN . DOI: 10.1093/treephys/23.13.865 Sites: US-Ton

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