Publications

Publications Found: 1378

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

Direct And Indirect Effects Of Elevated CO2 On Transpiration From Quercus Myrtifolia In A Scrub-Oak Ecosystem
Li, J., Dugas, W. A., Hymus, G. J., Johnson, D. P., Hinkle, C. R., Drake, B. G., Hungate, B. A.

Elevated atmospheric carbon dioxide (Ca) usually reduces stomatal conductance, but the effects on plant transpiration in the field are not well understood. Using …


Journal: Global Change Biology, Volume 9 (1): 96-105 (2003), ISBN . DOI: 10.1046/j.1365-2486.2003.00557.x Sites: US-KS2

Spatial Variation In Regional CO2 Exchange For The Kuparuk River Basin, Alaska Over The Summer Growing Season
Vourlitis, G. L., Verfaillie, J., Oechel, W. C., Hope, A., Stow, D., Engstrom, R.

The spatial and temporal patterns in CO2 flux for the Kuparuk River Basin, a 9200-km2 watershed located in NE Alaska were estimated using the Regional …


Journal: Global Change Biology, Volume 9 (6): 930-941 (2003), ISBN . DOI: 10.1046/j.1365-2486.2003.00639.x Sites: US-HVa, US-Upa

Increase Of Monoterpene Emissions From A Pine Plantation As A Result Of Mechanical Disturbances
Schade, G. W., Goldstein, A. H.

Mixing ratios and emission rates of monoterpenes were measured above a ponderosa pine plantation in the Sierra Nevada mountains before, during and after a pre-commercial thinning in spring 2000. The thinning removed and left onsite approximately one half of the plantations biomass. Monoterpene fluxes increased tenfold during the …


Journal: Geophysical Research Letters, Volume 30 (7): n/a-n/a (2003), ISBN . DOI: 10.1029/2002gl016138 Sites: US-Blo

Land Surface Heterogeneity In The Cooperative Atmosphere Surface Exchange Study (CASE-97). Part I: Comparing Modeled Surface Flux Maps With Surface-Flux Tower And Aircraft Measurements
Chen, F., Yates, D. N., Nagai, H., LeMone, M. A., Ikeda, K., Grossman, R. L.

Land surface heterogeneity over an area of 71 km × 74 km in the lower Walnut River watershed, Kansas, was investigated using models and measurements from the 1997 Cooperative Atmosphere Surface Exchange Study (CASES-97) field experiment. As an alternative approach for studying heterogeneity, a multiscale atmospheric and surface …


Journal: Journal Of Hydrometeorology, Volume 4 (2): 196-218 (2003), ISBN . DOI: 10.1175/1525-7541(2003)4<196:LSHITC>2.0.CO;2 Sites: US-Wlr

Simulated Variations In Atmospheric CO2 Over A Wisconsin Forest Using A Coupled Ecosystem-Atmosphere Model
Scott Denning, A., Nicholls, M., Prihodko, L., Baker, I., Vidale, P., Davis, K., Bakwin, P.

Ecosystem fluxes of energy, water, and CO2 result in spatial and temporal variations in atmospheric properties. In principle, these variations can be used to quantify …


Journal: Global Change Biology, Volume 9 (9): 1241-1250 (2003), ISBN . DOI: 10.1046/j.1365-2486.2003.00613.x Sites: US-Los, US-PFa, US-WCr

Remote Estimation Of Leaf Area Index And Green Leaf Biomass In Maize Canopies
Gitelson, A. A., Viña, A., Arkebauer, T. J., Rundquist, D. C., Keydan, G., Leavitt, B.

Leaf area index (LAI) is an important variable for climate modeling, estimates of primary production, agricultural yield forecasting, and many other diverse studies. Remote sensing provides a considerable potential for estimating LAI at local to regional and global scales. Several spectral vegetation indices have been proposed, but …


Journal: Geophysical Research Letters, Volume 30 (5): n/a-n/a (2003), ISBN . DOI: 10.1029/2002gl016450 Sites: US-Ne2, US-Ne3

Modelling Carbon Balances Of Coastal Arctic Tundra Under Changing Climate
Grant, R. F., Oechel, W. C., Ping, C.

Rising air temperatures are believed to be hastening heterotrophic respiration (Rh) in arctic tundra ecosystems, which could lead to substantial losses of soil carbon …


Journal: Global Change Biology, Volume 9 (1): 16-36 (2003), ISBN . DOI: 10.1046/j.1365-2486.2003.00549.x Sites: US-Brw

Classification Of Crop Yield Variability In Irrigated Production Fields
Dobermann, A., Ping, J. L., Adamchuk, V. I., Simbahan, G. C., Ferguson, R. B.

Crop yield maps reflect stable yield patterns and annual random yield variation. Procedures for classifying a sequence of yield maps to delineate yield zones were evaluated in two irrigated maize (Zea mays L.) fields. Yield classes were created using empirically defined yield categories or through hierarchical or nonhierarchical …


Journal: Agronomy Journal, Volume 95 (5): 1105-1120 (2003), ISBN . DOI: 10.2134/agronj2003.1105 Sites: US-Ne1, US-Ne2, US-Ne3

Soil-Nitrogen Cycling In A Pine Forest Exposed To 5 Years Of Elevated Carbon Dioxide
Finzi, A. C., Schlesinger, W. H.

Empirical and modeling studies have shown that the magnitude and duration of the primary production response to elevated carbon dioxide (CO2) can be constrained by limiting supplies of soil nitrogen (N). We have studied the response of a southern …


Journal: Ecosystems, Volume 6 (5): 444-456 (2003), ISBN . DOI: 10.1007/s10021-003-0205-1 Sites: US-Dk3