Publications

Publications Found: 1378

Water Limitations To Carbon Exchange In Old-Growth And Young Ponderosa Pine Stands
Irvine, J., Law, B. E., Anthoni, P. M., Meinzer, F. C.
We investigated the impact of seasonal soil water deficit on the processes driving net ecosystem exchange of carbon (NEE) in old-growth and recently regenerating ponderosa pine (Pinus ponderosa Doug. ex Laws.) stands in Oregon. We measured seasonal patterns of transpiration, canopy conductance and …


Journal: Tree Physiology, Volume 22 (2-3): 189-196 (2002), ISBN . DOI: 10.1093/treephys/22.2-3.189 Sites: US-Me4

Estimating Net Primary Productivity From Grassland Biomass Dynamics Measurements
Scurlock, J. M., Johnson, K., Olson, R. J.

To address the need for a high quality data set based upon field observations suitable for parameterization, calibration, and validation of terrestrial biosphere models, we have developed a comprehensive global database on net primary productivity (NPP). We have compiled field measurements of biomass and associated environmental …


Journal: Global Change Biology, Volume 8 (8): 736-753 (2002), ISBN . DOI: 10.1046/j.1365-2486.2002.00512.x Sites: US-KFB, US-Kon

Seasonal And Interannual Variation In Carbon Dioxide Exchange And Carbon Balance In A Northern Temperate Grassland
Flanagan, L. B., Wever, L. A., Carlson, P. J.

Net ecosystem carbon dioxide (CO2) exchange (NEE) was measured in a northern temperate grassland near Lethbridge, Alberta, Canada for three growing seasons using the eddy covariance technique. The study objectives were to document how NEE and its major component processes—gross photosynthesis (GPP) and total ecosystem …


Journal: Global Change Biology, Volume 8 (7): 599-615 (2002), ISBN . DOI: 10.1046/j.1365-2486.2002.00491.x Sites: CA-Let

Short-Term Light And Leaf Photosynthetic Dynamics Affect Estimates Of Daily Understory Photosynthesis In Four Tree Species
Naumburg, E., Ellsworth, D. S.
Instantaneous measurements of photosynthesis are often implicitly or explicitly scaled to longer time frames to provide an understanding of plant performance in a given environment. For plants growing in a forest understory, results from photosynthetic light response curves in conjunction with diurnal light …


Journal: Tree Physiology, Volume 22 (6): 393-401 (2002), ISBN . DOI: 10.1093/treephys/22.6.393 Sites: US-Dk3

Effects Of Aggregated Classifications Of Forest Composition On Estimates Of Evapotranspiration In A Northern Wisconsin Forest
Mackay, D. S., Ahl, D. E., Ewers, B. E., Gower, S. T., Burrows, S. N., Samanta, S., Davis, K. J.

Forest management presents challenges to accurate prediction of water and carbon exchange between the land surface and atmosphere, due to its alteration of forest structure …


Journal: Global Change Biology, Volume 8 (12): 1253-1265 (2002), ISBN . DOI: 10.1046/j.1365-2486.2002.00554.x Sites: US-PFa

How The Environment, Canopy Structure And Canopy Physiological Functioning Influence Carbon, Water And Energy Fluxes Of A Temperate Broad-Leaved Deciduous Forest–An Assessment With The Biophysical Model CANOAK
Baldocchi, D. D., Wilson, K. B., Gu, L.
This paper focuses on how canopy structure, its physiological functioning and the environment interact to control and drive the exchange of carbon dioxide (CO2) and water vapor between a temperate forest stand and the atmosphere. First, we present an overview of how temporal and spatial variations …


Journal: Tree Physiology, Volume 22 (15-16): 1065-1077 (2002), ISBN . DOI: 10.1093/treephys/22.15-16.1065 Sites: US-WBW

Carbon Sequestration Studied In Western U.S. Mountains
Schimel, D.S., Kittel, T.G.F., Running, S., Monson, R.K., Turnipseed, A.A., Anderson, D.

The U.S. carbon budget has been the focus of recent scientific debate [Fan et al., 1998; Pacala et al., 2001; Gurney et al., 2002] Even conservative estimates suggest that U.S. …


Journal: EOS, Transactions American Geophysical Union, Volume 83 (40): 445-449 (2002), ISBN . DOI: 10.1029/2002eo000314 Sites: US-NR1

Contrasting Soil Respiration In Young And Old-Growth Ponderosa Pine Forests
Irvine, J., Law, B. E.

Three years of fully automated and manual measurements of soil CO2 efflux, soil moisture and temperature were used to explore the diel, seasonal and inter-annual patterns of soil efflux in an old-growth (250-year-old, O site) and recently regenerating (14-year-old, Y site) ponderosa pine forest in central …


Journal: Global Change Biology, Volume 8 (12): 1183-1194 (2002), ISBN . DOI: 10.1046/j.1365-2486.2002.00544.x Sites: US-Me4, US-Me5

Effects Of Spatial Variability In Light Use Efficiency On Satellite-Based NPP Monitoring
Turner, D. P., Gower, S. T., Cohen, W. B., Gregory, M., Maiersperger, T. K.

Light use efficiency (LUE) algorithms are a potentially effective approach to monitoring global net primary production (NPP) using satellite-borne sensors such as the Moderate Resolution Imaging Spectroradiometer (MODIS). However, these algorithms are applied at relatively coarse spatial resolutions (≥1 km), which may subsume significant …


Journal: Remote Sensing Of Environment, Volume 80 (3): 397-405 (2002), ISBN . DOI: 10.1016/s0034-4257(01)00319-4 Sites: US-Bo1

Inversion Of Net Ecosystem CO2 Flux Measurements For Estimation Of Canopy PAR Absorption
Hanan, N. P., Burba, G., Verma, S. B., Berry, J. A., Suyker, A., Walter-Shea, E. A.

The fractional absorption of photosynthetically active radiation (fPAR) is frequently a key variable in models describing terrestrial ecosystem–atmosphere interactions, carbon uptake, growth and biogeochemistry. We present a novel approach to the estimation of the fraction of incident photosynthetically active …


Journal: Global Change Biology, Volume 8 (6): 563-574 (2002), ISBN . DOI: 10.1046/j.1365-2486.2002.00488.x Sites: US-Pon, US-Shd