Publications

Publications Found: 1437

Leaf Area Distribution And Radiative Transfer In Open-Canopy Forests: Implications For Mass And Energy Exchange
Law, B. E., Cescatti, A., Baldocchi, D. D.

Leaf area and its spatial distribution are key canopy parameters needed to model the radiation regime within a forest and to compute the mass and energy exchange between a forest and the atmosphere. A much larger proportion of available net radiation is received at the forest floor in open-canopy forests than in closed-canopy forests. …


Journal: Tree Physiology, Volume 21 (12-13): 777-787 (2001). DOI: 10.1093/treephys/21.12-13.777 Sites: US-Me4

Groundwater Flow Patterns In A Large Peatland
Fraser, C., Roulet, N., Lafleur, M.

Groundwater flow patterns and geochemistry were studied in the Mer Bleue bog, near Ottawa, Ontario, Canada. Groundwater flow patterns alternated between recharge, i.e. head gradients producing flow from the surface of the peatland to the deeper peat, and discharge, i.e. head gradients indicating flow from the deeper peat …


Journal: Journal Of Hydrology, Volume 246 (1-4): 142-154 (2001). DOI: 10.1016/s0022-1694(01)00362-6 Sites: CA-Mer

Carbon Dioxide And Water Vapor Exchange By Young And Old Ponderosa Pine Ecosystems During A Dry Summer
Law, B. E., Goldstein, A. H., Anthoni, P. M., Unsworth, M. H., Panek, J. A., Bauer, M. R., Fracheboud, J. M., Hultman, N.

We investigated key factors controlling mass and energy exchange by a young (6-year-old) ponderosa pine (Pinus ponderosa Laws.) plantation on the west side of the Sierra Nevada Mountains and an old-growth ponderosa pine forest (mix of 45- and 250-year-old trees) on the east side of the Cascade Mountains, from June through …


Journal: Tree Physiology, Volume 21 (5): 299-308 (2001). DOI: 10.1093/treephys/21.5.299 Sites: US-Me4, US-Me5

Paired-Tower Measurements Of Carbon And Energy Fluxes Following Disturbance In The Boreal Forest
Amiro, B. D.

Disturbances by fire and harvesting are thought to regulate the carbon balance of the Canadian boreal forest over scales of several decades. However, there are few direct measurements …


Journal: Global Change Biology, Volume 7 (3): 253-268 (2001). DOI: 10.1046/j.1365-2486.2001.00398.x Sites: CA-SF2, CA-SF3

Ecosystem Respiration In A Young Ponderosa Pine Plantation In The Sierra Nevada Mountains, California
Xu, M., DeBiase, T. A., Qi, Y., Goldstein, A., Liu, Z.
We estimated total ecosystem respiration from a ponderosa pine (Pinus ponderosa Dougl. ex Laws.) plantation in the Sierra Nevada Mountains near Georgetown, California, from June to October, 1998. We apportioned ecosystem respiration among heterotrophic, root, stem and foliage based on relationships …


Journal: Tree Physiology, Volume 21 (5): 309-318 (2001). DOI: 10.1093/treephys/21.5.309 Sites: US-Blo

FLUXNET: A New Tool To Study The Temporal And Spatial Variability Of Ecosystem–Scale Carbon Dioxide, Water Vapor, And Energy Flux Densities
Baldocchi, D., Falge, E., Gu, L., Olson, R., Hollinger, D., Running, S., Anthoni, P., Bernhofer, C., Davis, K., Evans, R., Fuentes, J., Goldstein, A., Katul, G., Law, B., Lee, X., Malhi, Y., Meyers, T., Munger, W., Oechel, W., Paw, K. T., Pilegaard, K., Schmid, H. P., Valentini, R., Verma, S., Vesala, T., Wilson, K., Wofsy, S.

FLUXNET is a global network of micrometeorological flux measurement sites that measure the exchanges of carbon dioxide, water vapor, and energy between the biosphere and atmosphere. At present over 140 sites are operating on a long–term and continuous basis. Vegetation under study includes temperate conifer and broadleaved (deciduous …


Journal: Bulletin Of The American Meteorological Society, Volume 82 (11): 2415-2434 (2001). DOI: 10.1175/1520-0477(2001)082<2415:FANTTS>2.3.CO;2 Sites: US-MMS

Year-Round Observations Of The Net Ecosystem Exchange Of Carbon Dioxide In A Native Tallgrass Prairie
Suyker, A. E., Verma, S. B.

An Ameriflux site was established in mid 1996 to study the exchange of CO2 in a native tallgrass prairie of north-central Oklahoma, USA. Approximately the first 20 months of measurements (using eddy covariance) are described here. This prairie, dominated by warm season C4 grasses, is typical of the central Kansas/northern …


Journal: Global Change Biology, Volume 7 (3): 279-289 (2001). DOI: 10.1046/j.1365-2486.2001.00407.x Sites: US-Shd

A Comparison Of Summertime Water And CO2 Fluxes Over Rangeland For Well Watered And Drought Conditions
Meyers, T. P.

Continuous measurements of the surface energy balance components (net radiation Rn, sensible heat flux H, latent heat flux LE, ground heat flux G, and CO2 fluxes began in early June of 1995 at the Little Washita Watershed, near Chickasha, Oklahoma. A severe drought during …


Journal: Agricultural And Forest Meteorology, Volume 106 (3): 205-214 (2001). DOI: 10.1016/s0168-1923(00)00213-6 Sites: US-LWW

Long-Term Observations Of The Dynamics Of The Continental Planetary Boundary Layer
Yi, C., Davis, K. J., Berger, B. W., Bakwin, P. S.

Time series of mixed layer depth, zi, and stable boundary layer height from March through October of 1998 are derived from a 915-MHz boundary layer profiling radar and CO2 mixing ratio measured from a 447-m tower in northern Wisconsin. Mixed layer depths from the profiler are in good agreement with radiosonde …


Journal: Journal Of The Atmospheric Sciences, Volume 58 (10): 1288-1299 (2001). DOI: 10.1175/1520-0469(2001)058<1288:LTOOTD>2.0.CO;2 Sites: US-PFa

Estimation Of Leaf Area Index In Open-Canopy Ponderosa Pine Forests At Different Successional Stages And Management Regimes In Oregon
Law, B., Van Tuyl, S., Cescatti, A., Baldocchi, D.

Leaf area and its spatial distribution are key parameters in describing canopy characteristics. They determine radiation regimes and influence mass and energy exchange with the atmosphere. The evaluation of leaf area in conifer stands is particularly challenging due to their open nature and clumping on the needle, shoot and tree …


Journal: Agricultural And Forest Meteorology, Volume 108 (1): 1-14 (2001). DOI: 10.1016/s0168-1923(01)00226-x Sites: US-Me4