Publications

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Publications Found: 46

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

Seasonal Differences In Carbon And Water Vapor Exchange In Young And Old-Growth Ponderosa Pine Ecosystems
Anthoni, P. M., Unsworth, M. H., Law, B. E., Irvine, J., Baldocchi, D. D., Tuyl, S. V., Moore, D.

Eddy covariance measurements of carbon dioxide and water vapor exchange were made above a young and an old-growth ponderosa pine (Pinus ponderosa Dougl. ex P. & C. Laws) ecosystem located in a semiarid environment in central Oregon. The old-growth stand (O site) is a mixture of 250- and 50-year-old ponderosa …


Journal: Agricultural And Forest Meteorology, Volume 111 (3): 203-222 (2002), ISBN . DOI: 10.1016/s0168-1923(02)00021-7 Sites: US-Me4, US-Me5

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

C-13 Content Of Ecosystem Respiration Is Linked To Precipitation And Vapor Pressure Deficit
Bowling, D., McDowell, N., Bond, B., Law, B., Ehleringer, J.

Variation in the carbon isotopic composition of ecosystem respiration (δ13CR) was studied for 3  years along a precipitation gradient in western Oregon, USA, using the Keeling plot approach. Study sites included six coniferous forests, dominated by Picea sitchensis,
Journal: Oecologia, Volume 131 (1): 113-124 (2002), ISBN . DOI: 10.1007/s00442-001-0851-y Sites: US-Me4


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), ISBN . DOI: 10.1016/s0168-1923(01)00226-x Sites: US-Me4

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), ISBN . DOI: 10.1093/treephys/21.5.299 Sites: US-Me4, US-Me5

Carbon Storage And Fluxes In Ponderosa Pine Forests At Different Developmental Stages
Law, B., Thornton, P., Irvine, J., Anthoni, P., Van Tuyl, S.

We compared carbon storage and fluxes in young and old ponderosa pine stands in Oregon, including plant and soil storage, net primary productivity, respiration fluxes, eddy …


Journal: Global Change Biology, Volume 7 (7): 755-777 (2001), ISBN . DOI: 10.1046/j.1354-1013.2001.00439.x Sites: US-Me4, US-Me5

Use Of A Simulation Model And Ecosystem Flux Data To Examine Carbon-Water Interactions In Ponderosa Pine
Williams, M., Law, B. E., Anthoni, P. M., Unsworth, M. H.
Drought stress plays an important role in determining both the structure and function of forest ecosystems, because of the close association between the carbon (C) and hydrological cycles. We used a detailed model of the soil–plant–atmosphere continuum to investigate the links between carbon uptake and …


Journal: Tree Physiology, Volume 21 (5): 287-298 (2001), ISBN . DOI: 10.1093/treephys/21.5.287 Sites: US-Me4

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), ISBN . DOI: 10.1093/treephys/21.12-13.777 Sites: US-Me4

Measurements Of Gross And Net Ecosystem Productivity And Water Vapour Exchange Of A Pinus Ponderosa Ecosystem, And An Evaluation Of Two Generalized Models
Law, B. E., Waring, R., Anthoni, P. M., Aber, J. D.

Net ecosystem productivity (NEP), net primary productivity (NPP), and water vapour exchange of a mature Pinus ponderosa forest (44°30′ N, 121°37′ W) growing …


Journal: Global Change Biology, Volume 6 (2): 155-168 (2000), ISBN . DOI: 10.1046/j.1365-2486.2000.00291.x Sites: US-Me4